Fungal / Mold Growth on Prickly Pear Cactus Opuntia Mill. fungal infections, white fuzz, mealybugs
POST a QUESTION or READ FAQs about problems with mold growth on cactus plants: cactus mold identification, cactus mold causes, & cactus mold remedies
InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.
Investigation of mold growth on the Nopal cactus and treatments for cactus mold contamination or growth:
The Mexican Nopal, or in English "prickly pear cactus" or "Barbary Fig cactus" is a member of the group Opuntia Spp. within the Cactaceae family.
Mold growth appears to be more common on cactii such as the Nopal when growing in higher and less arid regions such as the village of la Yerbabuena, near the foot of the volcano above Colima, Mexico.
This article describes mold growth on the Mexican Nopal cactus plants in the wild and on those grown as a food crop.
With a fungal growth sample collected from Nopal growing in Yerbabuena, Colima Mexico. in 2011 we began seeking an accurate identification of the fungus, and an exploration of its properties both on the plant and as a possible seasonal contributor to the aerobiological milieu.
Our project will also investigate and document the causes and effects of mold infection of Mexican pricklypear cactus plants, and the identification of other mold genera/species commonly found growing on and affecting those important plants.
We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.
Mold Growth on Cactus: genera/species of mold that infect cactus plants
The Mexican Nopal, or in English "prickly pear cactus" or "Barbary Fig cactus" is a species or group of species of Opuntia Spp. within the Cactaceae family.
While some sources  claim over 200 species in that group, the USDA lists 59 species and 75 accepted taxa within the Genus Opuntia Mill.
I am particularly interested in fungi found on species of Nopal found at altitude in more wet or humid highlands of Mexico.
These include fruit-bearing pricklypear species (Opuntia ficus indica) that are widely used as a food (both the cactus fruit or Tuna and the younger cactus pads or nopalito) and drink product (an intense purple juice in water) in Mexico as well as an export product in the form of Nopal fruits, Nopal juice, and in power and cosmetic forms. 
Some might think that because cactus plants generally grow in dry locations that they never suffer from fungal attack, but that's certainly not the case.
The page top photograph of a mold-infected Nopal (pricklypear) cactus plant was taken in Yerbabuena, Colima Mexico.
Yerbabuena is a tiny village located at a comparatively high altitude and close enough to Mexico's Pacific coast to receive more rainfall than some other areas of the country.
I have observed both superficial fungal growth on the intact skin of cactus plants and plants injured or destroyed by fungal attack.
Experts report fungal invasion of cactus plants by other vectors such as through wounds, cuts, and direct penetration of the cactus.
Watch out: while this article discusses cactus diseases that appear to be fungal or mold growths, some insect or parasitic cactus diseases maybe mistaken for mold.
At CACTUS COCHNEAL INFESTATION you will see examples of white fluffy or barnacle-like diseases on cactus that may not be funguses at all.
Above: small round black fungal colonies on a Nopal in Yerba Buena in Colima, Mexico.
Also see MOLD GROWTH on SURFACES, PHOTOS - What Does Mold Look Like on Various Materials & Surfaces? An extensive photographic guide to mold as it is found growing on various building materials & surfaces.
Appearance of Mold on Cactus: on the plant & under the microscope
Black & Other Dark Colored Molds on Cactus Plants
Mold growth on cactus is more common in areas where cacti such as the Mexican Nopal (below left) grows in higher and less arid regions such as la Yerbabuena, near the foot of the volcano above Colima, Mexico. (Photographs by DF, la Yerbabuena, Colima, Mexico, November 2011) Pricklypear cactus (Opuntia Mill. are also found in the U.S. in Florida and Hawaii as Opuntia cochenillifera.
Our Mexican Nopal cactus mold photo (at left, 1200x) seeks expert help with confirming its identity, and is discussed below.
Below (right) and tentatively identified as a Lasiodiplodia theobromae -like fungus are microscopic images (approximately 600x) of the mold we found growing on the Mexican Nopal cactus.
The conidia (spores) are obovate to pyriform, with a thick cell wall, dark brown, smooth, with a single transverse septum near the base. They appear to grow in opposed pairs on either side of the hypha. The upper larger segment of the spore is generally darker than its base.
We also found, no surprise, species of Cladosporium sp. on this cactus surface. Some experts report that superficial molds such as powdery mildew may appear on some cactus houseplants. Mildew on cactus will appear white or gray-white and is principally a cosmetic issue. 
Lab microphotographs and work to identify the black cactus mold shown above are in process - Ed.
Question: cause & treatment for black mold on cactus
(Feb 5, 2015) Darlene said:
I have a Suharo that looks healthy but it has several hard black circles close to the bottom of the cactus. Is the mold? and what should I do to stop it?
Over-watering or too much shade are factors that can increase the risk of mold growth on a cactus but of course by e-text I can't see what's going on with your plant.
If you like use the email found at our CONTACTS link (page bottom) to send me some photos of your Saguaro (Carnegiea gigantea) cactus common in the Sonoran desert and in the Organ Pipe Cactus National Monument in the U.S. A 5-armed sajuaro is likely to be as much as 200 years old.
Below is a photograph of round black fungal attack on a different cactus, the species discussed on this page, the Nopal.
List of fungal diseases of cactus plants
Here our photo shows a typical colony formation on the surface of a cactus plant, viewed by stereo microscope.
Here are some of the many fungal species associated with cactus plants and/or the soils around them.
Keep in mind that many fungi may be helpful to certain cactus species both in soils and at cactus roots and at other plant locations or in controlling cactus pests.
But some fungal genera/species are indeed reported to invade or attack and damage or even kill cactus plants including:
Fusarium sp. 
Aspergillus fumigatis [through plant soil]
Aspergillus niger [through plant soil]
Aspergillus parasiticus [possibly]
Colletotrichum sp, (anamorph: C. gloeosporioides) (cactus stem rot)
Fomes robustus (heart rot fungus) 
Glomerella cingulata (cactus stem rot) 
Lasiodiplodia theobromae - a member of the Botryosphaeriaceae/ B. rhodina family, wide ranging plant pathogen, may cause fungal (mycotal) keratitis and stem-end rot, a citrus plant disease, possible cause of nail and skin lesions on humans 
22 fungal species associated with cactus plants were identified by an assay of 900 endophyge isolates
Comment: Apressoria or hyphopodia on cactus
(Sept 8, 2015) Ludovic said:
The mold you show here is none of the one suggested. The peg-like projection from the darkly colored hyphae are called 'appressoria' or 'hyphopodia', used to anchor on their substrate and also suck up nutrient from it.
The ones you show are characteristics of epiphyllous fungi in the Orders Meliolales (or black mildew) or Asterinales, depending the ascoma (=fruiting body, spore containing structure) associated with them. Did you find big spore with 3 to 5 cells (Meliolales) or small spore with only 2 cells (Asterinales)?
I love fungi but I have no idea how to treat plant that carry them. It seems to me that these fungi proliferate in particularly wet places (tropical?). I saw many of them on almost all sorts of plants in some very wet part of Costa Rica. I dont know if that will help.
Thank you Ludovic, I've continued to collect fungal growth from succulents, particular cactus plants in central Mexico.
From the in-situ look these do not seem to be a mildew - the surface is very scaly and hard.
When I'm back I'll take a look through the microscope to see what spores we can isolate - if any. Possibly during wet weather they'll make a cameo appearance. But generally these are appearing at various altitudes up to 7000 ft but in a usually-dry climate.
I'd be grateful for any citations / references you can add for cactus-infecting cacti.
White & Light Colored Mildew & Other Molds on Cactus Plants
White stuff found on both indoor and outdoor plants (photo at left) including cactus plants may be mildew,
If the cactus is being kept in a too-wet or too-humid environment.
Mildew infection of a cactus is more likely for plants grown out of their native (dry) environment, and when the cacti are kept close to other mildew-infected plants.
Our photo (above left) shows what mildew spores look like under the microscope.
Other "white stuff" we see on cactus plants may be a left-over deposit from having sprayed or washed the cactus plant with vinegar or other solutions.
How to Remove a Mealybug Infestation on Cactus
Watch out: some "white stuff" on cacti and certainly on other plants may be mealybugs not a fungal infection, but deserving action. Our mealybug photo below was provided by Iranian reader P.C. 2018/10/12.
The insecticides discussed earlier on this page are helpful at dealing with mealybug infestation. Alternatively, cleaning the infected area with a soft brush and a spray of 70% isopropanol (alcohol) can be effective at removing mealybugs from cactus and other succulents.
Using a soap solution and brush can also rid mealybug infections.
Neem oil, as we discuss in this article, can be sprayed as an effective mealybug control.
And according to planetnatural.com, "Commercially available beneficial insects, such as ladybugs, lacewing and the Mealybug Destroyer (Cryptolaemus montrouzieri), are important natural predators of this pest."
Pesticides such as Bonide Chemical 952 Number-1 2-Percent Systemic Granules can be applied to the soil to (ultimately) provide systemic protection against recurrent mealybug infestations.
Treatments for Cactus Mold Growth - may also be helpful with mealybug infestation
Some, perhaps most molds molds observed on cactus plants may not actually harm the plants but may remain a cosmetic issue for hobbyists. Popular cactus mold cures include:
Removal and disposal of the mold-infected cactus part if feasible - suitable for cactus house plants;
Using a cotton swab moistened with vinegar or with 70% alcohol to clean small infected areas of cacti used as house plants.
Watch out: cactus horticulturists point out that vinegar can be purchased in varying strengths for horticultural and other uses (thus its effectiveness as a fungicide may vary), and it is also reported that using vinegar on cactus may both help and harm the plant, depending on the strength of the vinegar solution, its application, and the plant species.
Also, there may be a connection between subsequent cactus damage and acetic acid bacteria.  Stan Starbuck reports that
while vinegar has been used successfully to treat certain fungal infections on soil surfaces
Some plants such as Aloe, Haworthia and Euphorbia suffered small amounts of cosmetic skin damage. Other plants sprayed in the same manner such as Hurenia, Echinocereus, Mammillaria and Rebutia suffered fatal results.
Watch out: furthermore, often "white stuff" that appears to be "growing" on the surface of soil around plants, particularly houseplants, may not be a fungus at all, but rather a white mineral deposit left on the soil surface from watering activities.
The "vinegar cure" for this condition is not killing off a mold infection. Instead it is dissolving the mineral salts back into the soil, just as we use vinegar to de-scale a coffee maker.
For cacti grown as crops, different approaches are needed including attention to mold sources (piles of organic debris nearby) and perhaps dusting the crop with a Bordeaux mixture.
Avoid over-watering cactus at any time but particularly if it is suffering from mildew or mold growth.
Question: treatments for white fungus on cactus
(May 20, 2014) mark said:
White mold or fungus treatment on Nepal cactus
(Oct 11, 2015) steven said:
have a 12 foot cactus and i see white mold on it. How do I save it or is it doomed?
Mark, I guess you meant to type Nopal. Indeed there can be more than one genera/species of fungi on a plant, or the same fungus may appear differently at different growth stages.
I'm doubtful that a spray fungicide is the best approach for the plant - at least not before diagnosing the cause of the fungus growth. For example an over-wet plant may continue to have trouble.
Australia's Garden Web (www.au.gardenweb.com) has listed these fungicides used successfully on cactus plants
Hortico Rose dust fungicide and insecticide
Yates Garden Spray insecticide fungicide
Depending on where you live, different products may be available.
Watch out: if you are harvesting nopal for food use be sure to read the MSDS and toxicity data for the fungicide that you are considering.
White "Mold" on Cactus that is Cochineal, Not Mold
Reader Question: tons of white mold on cactus trees
2016/08/22 Jane C. Ti said:
Dear Cactus Specialist, Our Cactus trees which are about more than 12 ft. tall, & they did have pink fruits, guess = Prickly Pears; are all sick with tons of white mold, please see the attached picture.
Would you please advise me, regarding: how to rescue these poor sick ones.
Thanks in advance! Sincerely looking forward to hearing from you at your convenience! Desperately, Jane
[Click to enlarge any image] Shown here, la Cochinilla (Cochineal) on a Nopal cactus, illustrated in "el Nopal", Artes de Mexico, No. 59.
With regret, I'm a cactus-interested investigator but not a cactus expert by any means.
Your description sounds like one of the species of Nopal or prickly-pear cactus (Opuntia is the "prickly pear cactus" genus in the cactus family, Cactaceae). There are about 90 species of Opuntia.
You can use our page bottom CONTACT link to send us photos for posting or comment.
From what I've read as an amateur, fungal diseases on cactus plants are difficult to treat, in my opinion largely because the fungus is environmentally caused - all molds are everywhere all the time: it's the local condtions that make a mold flourish and become a problem.
In the left of this photo you see a light gray-white fungus on the nopal and a common parasite climbing on the organos cactus in the right of the same image.
These cacti were photographed in Pozos, in Guanajuato, Mexico.
At least one cactus "expert" (cactiguide.com) gives the depressing advice that you give up, take a clean healthy cutting and start a new plant.
In my view that's not gong to cut it if problem source in the local environment - too much water, shade, or something else isn't also found and corrected.
I'm doubtful that a fungicidal spray will be effective for dark scaly mold damage: the cacti I've examined with such black or dark molds were almost impossible to clean of mold growth.
But here's the good news. Well good of a sort.
Often a white "mold" or "fungus" people think they see on cactus is not a fungal disease but rather an insect. In fact often a white fuzzy "deposit" seen on Opuntia is cochineal (Dactylopius coccus) a scale insect in the suborder Sternorrhyncha, from which the natural dye carmine is derived.
Cochineal produces an intense red dye whose cultivation in pre-hispanic Mexico and whose later production was kept secret by the Spanish in Mexico.
Without over-pricking yourself, scrape off a bit of the white stuff and rub it between thumb and forefinger.
If your fingers become stained with an intense red dye, that's Dactylopius coccus (some texts refer to it as a "mealybug" ).
If that's what's on your cactus you might be able to clean it off with a soft long-bristle brush and dish soap or an insecticidal soap.
I'd avoid very strong power washing as it's likely to damage the cactus itself. Locally here in San Miguel de Allende our jardinero expert uses neem oil on several plant species to resist insect attack.
White Growth on Melon Cactus in Iran
Reader Question: white growth on Melocactus diamantinus and other cactus
im from iran I have a few cactus and i have a problem (disease)
My Melocactus diamantinus and a few other cactus have a disease but I can't find a treatment.
I need to help find diseases and treatment ? i send few picture this email . Thanks for help. - Anonymous by private email
Reply: diagnosis & treatment of white fluffy or barnacle-like infestation on cactus: mealybug / cochneal insects
As we illustrate starting at CACTUS COCHNEAL INFESTATION you will see examples of white fluffy or barnacle-like diseases on cactus that are insect-based rather than fungal.
Try scraping off some of the larger white growths on your cactus and mashing those between a thumb and forefinger. If you see a red dye in the result your cactus are infested with mealybugs or cochneal insects.
For other readers, English names for Melocactus diamantinus include Turk’s Cap, Melon Cactus
Treatments for Dactylopius sp. - cochneal mealybug infestations on cactus
For limited cochneal / mealybug infestations and those detected early you can often remove the insects using a garden hose with a spray nozzle, taking care to aim the spray so as to send the mealybugs and their white fuzz into a harmless area of the ground, not down into the soil around your cactus plant.
For more firmly-attached barnacle-like white cochneal growths on cactus you may need to use a stiff bristle brush or on smaller cactus plants, a toothbrush, to scrub off the browth. Scrub using an insecticidal soap or neem oil mixture.
What are Dactylopius sp. - mealybugs, or cochneal bugs ?
[Mealybugs] are small scale insects that feed on the cactus.
They produce fluffy white wax that hides their bodies as they feed on the cactus and protects them from the elements (drying out, in particular) and from predation. The fluffy wax also serves as a sail or balloon to float on the wind and take the bugs to a new patch of cactus.
The bugs produce carminic acid that also helps protect them from predation, especially from ants.
This carminic acid in the bugs has been used by indigenous peoples of southwestern North America, Central America and sub-tropical South America to make a brilliant red dye for centuries, perhaps millennia, to produce beautifully colored textiles.
Originally, the cochineal bugs were limited to the New World. When the European explorers visited and saw the beautiful red cloth of the natives, they took the cochineal bugs back with them and now they occur all over the world. - source: Ladyird Johnson Wildflower Center, 4801 La Crosse Ave.,
Austin, TX 78739 USA, Tel: 01 512.232.0100, https://www.wildflower.org/expert/show.php?id=9592 retrieved 2018/10/07
Other Pricklypear Cactus Nopal or Tuna Photographs
Nopalitos are sold in local markets as well as larger supermarkets and are exported as well. The young nopalito pads are harvested and cleaned of thorns for sale. (Left and below left).
Nopal is sliced into strips or diced, then cooked alone (boiled or grilled) or with a mixture of onions and other herbs, and consumed as a vegetable.
The Nopal fruit or Tunas (see photo near page top and below right) are harvested using a long pole on the end of which may be a forked nail-pair used to hook the fruits.
Tunas may be peeled and eaten as a fruit but quite often are immersed in water, on occasion with added sugar, to make a fruit beverage.
Below, two more afflictions of nopal cactu in San Miguel de Allende, Mexico.
Below: parasitic attack on Organos cactus
Continue reading at CACTUS MOLD Article Sumary & Abstract of the article above published by PAAA, or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.
MOLD GROWTH ON SURFACES, PHOTOS - Photos of what mold looks like in buildings on more than 100 surfaces, organized by mold growth on various kinds of building surfaces and contents or items found in buildings. Mold in situ.
MOLD RELATED ILLNESS SYMPTOMS - Mold Related Illness: Index of Symptoms. Readers should not rely on this document for medical diagnosis and instead should consult with their physician or with a specialist such as a medical toxicologist
 North Dakota State University Extension Service, Cass County, Horticulture & Gardening, web search 02/29/2012, original source: ag.ndsu.edu/casscountyextension/horticulture
 "Cactus Rot, Prevention, Causesd, Identification & Solutions - Stem Rot [ on cactus plants ]", Cactus Culture, Kada's Garden, web search 02/29/2012, original source kadasgarden.com/Crot.html
 Martin B. Ellis & J. Pamela Ellis, Croom Helm, London, 1988, ISBN 0-7099-5316-X. , Ref: Microfungi on Miscellaneous Substrates, an Identification Handbook, Martin B. Ellis & J. Pamela Ellis, Croom Helm, London, 1988, ISBN 0-7099-5316-X.
 Martin B. Ellis & J. Pamela Ellis, Croom Helm, London, 1988, ISBN 0-7099-5316-X. , Ref: Microfungi on Miscellaneous Substrates, an Identification Handbook, Martin B. Ellis & J. Pamela Ellis, Croom Helm, London, 1988, ISBN 0-7099-5316-X.
 Atlas of Clinical Fungi, 2nd Ed., GS deHoog, J Guarro, J Gene, & MJ Figueras, Centraalbureau voor Schimmelcultures, Universitat Rovira I Virgili, 2000, ISBN 90-70351-43-9 (you can buy this book at Amazon) - The Atlas of Clinical Fungi is also available on CD ROM
 "Lasiodiplodia theobromae", Mycology online, University of Adelaide, web search 02/29/2012, original source mycology.adelaide.edu.au/Fungal_Descriptions/Coelomycetes/Lasiodiplodia/
 "Ideas, ... Using Vinegar on Succulent and Cactus Plants", Stan Starbuck, windowsillcactus.com, web search 02/29/2012, original source: http://windowsillcactus.com/ideas.shtml Email: email@example.com
 "Acetic Acid Bacterial Biota of the Pink Sugar Cane Mealybug, Saccharococcus sacchari, and Its Environs", Nicholas J. Ashbolt, Peter A. Inkerman, Applied and Environmental Microbiology, Appl. Environ. Microbiol. March 1990 vol. 56 no. 3 707-712
 "Acetic Acid Bacteria, Newly Emerging Symbionts of Insects", Elena Crotti1, et als, Appl. Environ. Microbiol. November 2010 76:6963-6970
 "Yeasts vectored by insects feeding on decaying saguaro cactus", Starmer4, WT et als, and
 "The vectoring of cactophilic y
 "Aspergillus fumigatus and aspergillus niger in two potted ornamental plants, cactus (epiphyllum truncatum) and clivia (clivia miniata). Biological and epidemiological aspects", F. Staib, B. Tompak, D. Thiel and A. Blisse, Mycopathologia, Volume 66, Numbers 1-2, 27-30, DOI: 10.1007/BF00429589. Abstract quotation:
The presence and growth of Aspergillus fumigatus and Aspergillus niger in the soil of ornamental plants have been demonstrated. The ecological conditions in the soil of such plants as influenced by temperature, humidity, desiccation, fertilization and ventilation obviously influence such fungal growth. The epidemiological significance of these findings is of interest with a view to the present efforts to control aspergillosis in the environment of susceptible persons.
Observations of a preferential growth of certain Aspergillus species in the soil of defined plants under defined conditions raise problems of soil microbiology.
 "Mycorrhizal fungi enhance growth and nutrient uptake of prickly-pear cactus (Opuntia albicarpa Scheinvar `Reyna') plantlets after ex vitro transplantation", Estrada-Luna, A. A. Davies, F. T., JOURNAL OF HORTICULTURAL SCIENCE AND BIOTECHNOLOGY, 2001, VOL 76; PART 6, pages 739-745
 "Endophytic fungi associated with cacti in Arizona", Trichur S. Suryanarayanana, Sally K. Wittlingerb, Stanley H. Faeth, Mycological Research,
Volume 109, Issue 5, May 2005, Pages 635–639
 "Survey of Diseases Discovered on Opuntia Ficus-Indica [cactus pear] in Producer Countries", G. Granata, A. Sidoti,
ISHS Acta Horticulturae 581: IV International Congress on Cactus Pear and Cochineal,
The numerous diseases present on cactus pear (Opuntia ficus-indica) in the producer areas worldwide are caused by biotic agents such as bacteria, yeasts, fungi, phytoplasmas and viruses, and abiotic agents such as atmospheric conditions. The terms virus- like or phytoplasma- like diseases refer to symptoms of which the underlying pathogen is not known but which resemble the symptoms caused by viruses or phytoplasms.
Most diseases are caused by fungi. The diseases often result in severe damage, especially to the cladodes, roots, and fruits, even in the postharvesting period. As some of the diseases can jeopardize the entire cultivation, stricter control should be exercised on propagative material and on importation from other countries. Prevention is often the best way to control the diseases and keep them from spreading into areas that are not affected.
This paper reports on the major cactus pear diseases present in the growing areas, the characteristics of the causal agent, the symptomatology and the control measures.
 "Fungi Isolated in Culture from Soils of the Sonoran Desert", Francis V. Ranzoni, Department of Biology, Vassar College, Poughkeepsie, NY, Mycologia, Vol 60 No. 2. Mar.-Apr. 1968, Mycological Society of America
Samples were taken from the top 2 inches, including the surface, of virgin soils from 24 localities in the Sonoran Desert. There were 107 [fungal] genera and 229 [fungal] species isolated in addition to some unidentified Phoma spp., mycelia with clamp connections and large numbers of other seterile mycelia. No thermophiles were isolated.
There does not seem to be a fungus flora that is characteristic of desert soils. The melanic Fungi Imperfecti occurred in large numbers, though not necessarily in greater numbers of species than the non-melanic forms. Many of the isolated species are pan-world. The soil contained many species commonly associated with dung, others known to be plant or animal pathogens and others as laboratory contaminants. Many of the species may not be true soil fungi and their presence in the soil simply fortuitous.
 Occurrence of Colletotrichum Stem Rot Caused by Glomerella cingulata on Graft-Cactus in Korea
Young Ho Kim, Ok Kyoung Jun, Mi Joo Sung, Jun-Sung Shin, Jung Ho Kim, Myoung-Il Jeoung, The Plant Pathology Journal Vol.16 No.4, 2000.8, page(s): 189-246
In 1999 and 2000, a rot of graft-cacti including Hylocereus trigon us (three-angled cactus), Gymnocalycium mihanovichii, and Chamaecereus silvestrii occurred in several greenhouses in major cactus-growing areas of Korea. Typical symptoms included a moist, light brown rot or a watery rot of the stems. A Colletotrichum sp, was isolated from the lesions. The fungus formed dark gray, dense or floccose colonies on potato dextrose agar, frequently forming many light pink acervuli often surrounded with setae. The hyaline, cylindrical conidia were one-celled with round ends. Appressoria were mostly semicircular or clavate. Thin-walled asci contained eight, one-celled, hyaline ascospores (biseriate in ascus). Ascopspores were straight or curved, ellipsoidal or subcylindrical. Based on these characteristics, the fungus was identified as Glomerella cingulata (anamorph: C. gloeosporioides). Wound inoculation of basal stems of the cactus by the mycelial plugs or conidia produced symptoms identical to those described above. Various cactus species were compared in susceptibility using stem disc inoculation. Cereus tetragonus, Eriocereus jusbertii, Myrtillocactus geomentrizans, and three-angled cacti from Mexico and Taiwan were susceptible, but C. peruvianus (Peruvian apple cactus) and Harrisia tortuosa not This is the first report of G. cingulata causing stem rot of graft-cactus in Korea
 "Fomes Robustus, a Heart-Rot Fungus on Cacti and Other Desert Plants", Ross W. Davidson, James L Mielke, Mycologia, Vol. 39, No. 2, Mar. - Apr., 1947, Mycological Society of America, [... wood-decaying Hymenomycetes have not been reported as causing decay in the woody skeleton in living cacti. In 1941 Baxter described Poria carnegiea Baxter, which he collected on the woody ribs of fallen plants of the giant cactus or saguaro (Cereus giganteus). He states "This plant is the first Poria described on cactus." In 1941 during investigations of disease and decline of the giant cactus in Arizona, L.S. Gill and P.C. Lightle of the Division of Forest Pathology observed sporophores of a Fomes on the bark-like tissues at the base of arms of living plants and also near the base of the main stem on ribs exposed as the result of injury.
Specimens of the Fomes were collected and sent to the senior author for identification and later collections of similar specimens from cacti and other desert shrubs and trees were obtained by the junior author and others. Also, older collections from certain woody plants filed in the Forest Pathology herbarium at Albuquerque were examined."
 "Pathogenicity of Beauveria bassiana (Deuteromycota: hyphomycetes) against the cactus weevil, Metamasius spinolae (Coleoptera: curculionidae) under laboratory conditions", Felipe Tafoyaa, Mario Zuñiga-Delgadillob, Raquel Alatorre, Juan Cibrian-Tovar, and David Stanley, Florida Entomologist 87(4):533-536. 2004
Three strains of the entomopathogenic fungus Beauveria bassiana Vuill. were tested for pathogenicity against adults of Metamasius (=Cactophagus) spinolae Gyllenhal. M. spinolae is an important pest of cactus plants (Opuntia ficus indica), which are used as a food crop and to avoid erosion in Mexico. After inoculation in a spray tower, M. spinolae adults were susceptible to B. bassiana at concentrations of 1 × 108 conidia per milliliter. Female mortality was steadily higher than male mortality for all isolates. One of the three isolates caused significantly higher mortality (82%) in females, whereas male mortality was the same for all isolates. These results indicate for the first time the possible use of B. bassiana as biocontrol agent against this insect pest.
Tres aislamientos del hongo entomopatógeno Beauveria bassiana Vuill. fueron evaluados en su patogenicidad contra adultos de Metamasius (=Cactophagus) spinolae, Gyllenhal. M. spinolae es una importante plaga de plantas de nopal (Opuntia ficus indica), que son usadas como alimento y para evitar la erosión en México. Después de ser inoculados en una torre de aspersión, adultos de M. spinolae fueron susceptibles a concentraciones de B. bassiana de 1 × 108 conidios por mililitro. La mortalidad en hembras fue consistentemente mayor que la mortalidad de machos para todos los aislamientos. Uno de los tres aislamientos causó significativamente mayor mortalidad (82%) en hembras, mientras que la mortalidad en machos fue la misma para todos los aislamientos. Estos resultados muestran por vez primera el posible uso de B. bassiana como agente de control biológico en contra de este insecto plaga.
 "Opuntia cochenillifera (L.) Mill. cochineal nopal cactus", United States Department of Agricutlture (USDA) Natural Resources Conservation Service, web search 3/27/12, original source: http://plants.usda.gov/java/profile?symbol=OPCO4, [copy on file as /mold/Opuntia_cochenillifera_cochineal_nopal_cactus_USDA.pdf]
 "Classification for Kingdom Plantae Down to Genus Opuntia Mill.", USDA, Natural Resources Conservation Service, web search 3/27/12, original source: http://plants.usda.gov/java/ClassificationServlet?source=display&classid=OPUNT [copy on file as /mold/Opuntia_Mil_Species_List_USDA.pdf]
 "What is Nopal", [no named author, no named mailing address] Email: firstname.lastname@example.org, web search 3/27/12, original source: http://www.nopalexport.com/What.htm, [copy on file as /mold/What_is_Nopal.pdf]
"Disease Prevention in Home Vegetable Gardens,"
Department of Plant Microbiology and Pathology,
Department of Horticulture, University of Missouri Extension - extension.missouri.edu/publications/DisplayPub.aspx?P=G6202
Fifth Kingdom, Bryce Kendrick, ISBN13: 9781585100224, is available from the InspectAPedia online bookstore - we recommend the CD-ROM version of this book. This 3rd/edition is a compact but comprehensive encyclopedia of all things mycological. Every aspect of the fungi, from aflatoxin to zppspores, with an accessible blend of verve and wit. The 24 chapters are filled with up-to-date information of classification, yeast, lichens, spore dispersal, allergies, ecology, genetics, plant pathology, predatory fungi, biological control, mutualistic symbioses with animals and plants, fungi as food, food spoilage and mycotoxins.
Fungi From Utility Poles in the Eastern United States, Identification Manual for, CJK Wang & RA Zabel Ed., Allen Press, 1990, ISBN 0-93-0009-31-2
Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. Tel: (416) 964-9415 1-800-268-7070 Email: email@example.com. The firm provides professional home inspection services & home inspection education & publications. Alan Carson is a past president of ASHI, the American Society of Home Inspectors. Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. Carson Dunlop Associates' provides extensive home inspection education and report writing material.
The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors. Special Offer: For a 5% discount on any number of copies of the Illustrated Home purchased as a single order Enter INSPECTAILL in the order payment page "Promo/Redemption" space.
TECHNICAL REFERENCE GUIDE to manufacturer's model and serial number information for heating and cooling equipment, useful for determining the age of heating boilers, furnaces, water heaters is provided by Carson Dunlop, Associates, Toronto - Carson Dunlop Weldon & Associates Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on any number of copies of the Technical Reference Guide purchased as a single order. Just enter INSPECTATRG in the order payment page "Promo/Redemption" space.
The Home Reference Book - the Encyclopedia of Homes, Carson Dunlop & Associates, Toronto, Ontario, 25th Ed., 2012, is a bound volume of more than 450 illustrated pages that assist home inspectors and home owners in the inspection and detection of problems on buildings. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Field inspection worksheets are included at the back of the volume.
Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Enter INSPECTAHRB in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on these courses: Enter INSPECTAHITP in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
The Horizon Software System manages business operations,scheduling, & inspection report writing using Carson Dunlop's knowledge base & color images. The Horizon system runs on always-available cloud-based software for office computers, laptops, tablets, iPad, Android, & other smartphones