Cedar-apple rust on Eastern red cedar (juniper) is commonly seen in the spring in North America. This fungus also infects apple trees and can cause significant damage if not controlled. You can find links to information resources on plant-associated fungi here, including a link to the U.S. National Fungus Collections Fungal Databases website.
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Plant-parasitic Ditylenchus destructor female containing an egg, isolated from iris bulbs. Specimens were sent from France to the APHIS inspection port at Oakland, CA, and intercepted and sent to the USDA Beltsville Nematology Laboratory in October 2003. The nematode is viewed with differential interference microscopy.
Rose downy mildew causes significant losses for growers nearly every year and is most prevalent under warm and very humid conditions. A comprehensive review of this disease can be found here. You can find links to information resources on other plant-associated fungi here, including a link to the U.S. National Fungus Collections Fungal Databases website.
The common and damaging root knot nematode, Meloidogyne incognita, on okra with female and juvenile in root, aerial plant symptoms, second stage juvenile viewed with differential interference microscopy, from a Beltsville, MD USDA ARS BARC field plot.
Peanut smut is a serious disease of peanuts, currently only known in South America. Field losses can be as high as 50% under certain conditions. You can find links to information resources on plant-associated fungi here, including a link to the U.S. National Fungus Collections Fungal Databases website.
Fungal-feeding and possibly plant parasitic nematode, Aphelenchoides bicaudatus from greenhouse strawberries at USDA-ARS BARC viewed under a polarizing microscope.
The Mycology & Nematology Genetic Diversity & Biology Laboratory provides the knowledge required for identification of agriculturally important fungi and nematodes and development of environmentally safe controls for plant-parasitic nematodes. The laboratory maintains one-million reference specimens in the U.S. National Fungus Collections and USDA Nematode Collection with associated information to enhance plant protection; develops resources for identification and systematics of fungi and nematodes; and discovers methods for suppression of plant-parasitic nematodes.
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