Plant Disease Management Handbook

Nematodes

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Ayoub, 1980.

Angular lesions are due to the foliar nematode on this Stachys sp.

OSU Plant Clinic collection, 2012.

Nematode trapping fungus.

OSU Plant Clinic, 2020.

Russ Ingham and Kathy Merrifield, 1997.

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Oregon’s Most Unwanted: Invasive Species

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Symptoms of Plum Pox Virus on peach fruit including rings and blotches of uneven color. Courtesy Ontario Ministry of Agriculture, Food and Rural Affairs. © Queen's Printer for Ontario, 2010. Reproduced with permission.

Queen's Printer for Ontario, 2010.
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Pathogens Common to Many Plants

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Conidium of Alternaria solani that has germinated on a potato leaf surface and formed several appressoria. (Dark elongate structure is the conidium while the dark circular object is an air bubble.)

Jay W. Pscheidt, 1980's.
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Pathogen Articles

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Plant pathogens can include fungi, bacteria, viruses, nematodes and even parasitic plants. Non-pathogenic phenomena include such things as environmental problems, nutrition excess or deficiency, and moss or lichens.

(Image shows blue stained fungal ascospores of Anisogramma anomala and rounded pollen of hazelnut.)

Stephanie Hechert, 2011.
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