"Burning" of plant tissue from infection, lack or excess of some nutrient, sunburn, or other weather conditions.
Scorched leaves typically have necrotic areas on the margins and tips of leaves.
Photo by Ralph S. Byther
A naked, multinucleate, vegetative (fungal) body capable of amoeboid motion.
A disease produced by some unfavorable physical or environmental factors (e.g., light, temperature, water, soil nutrients, chemical, physical or mechanical injury).
Generally microscopic tubular worms, usually living free in moist soil, water, and decaying matter, or as parasites of plants and animals.
Ayoub, 1980.
Angular lesions are due to the foliar nematode on this Stachys sp.
OSU Plant Clinic collection, 2012.
A symbiotic association of a fungus with the roots of a plant.
Suillus sibiricus ectomycorrhizae on inoculated Pinus albicaulis seedling in the nursery.
Cathy Cripps
The death or disintegration of cells and tissues in a localized area of an organ.
Ability of an otherwise susceptible variety of plant to escape infection because of the way it grows (e.g., early-maturing plants escape late-season diseases).
Control of disease by eliminating the pathogen after it is already established.
An abnormal downward-curving growth or movement of a leaf, leaf part, or stem.
The major goal of the Oregon Department of Agriculture's Plant Health Program is to protect and enhance Oregon's agricultural industries, environment, and quality of life by providing diagnostic services, testing, surveys, and certification for plant pests and diseases. The Plant Health Program supports the specialty seed and nursery industries by offering services that enable Oregon growers and farmers to meet requirements for both domestic and export markets.
