abiotic stress
Nonliving environmental factors such as frost, drought, excessive heat, high winds, etc., that can have harmful effects on plants.
GardenWeb Glossary of Botanical Terms
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abiotic disease. A disease caused by factors other than pathogens.
abiotic disorder. A disease caused by factors other than a pathogen; physiological disorder.
Abiotic Stress
Grasses require a certain set of conditions to grow correctly. Brown spots are most often caused by abiotic stress. High or low temperatures can cause grasses to brown as can drought conditions.
Generally, abiotic problems affect all species of plants simultaneously, whereas diseases usually affect one species, start in one area and then spread. Abiotic problems can often kill quickly (within a few days) without a yellowing stage.
Physiological disorder-A disorder caused by factors other than a pathogen; an abiotic disorder.
Phytochemical-A chemical found in plants that provides human health benefits, including disease prevention.
 See also: Plant, Environment, Organism, Pathogen, Water
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