Oil and sulfur together they are phytotoxic to these grape plants.
Jay W. Pscheidt.
A substance (usually liquid) formed inside a plant and discharged from diseased or injured tissue. The presence of an exudate often aids in diagnosis (e.g., fire blight bacteria).
A group of fungi that produce oospores such as Pythium, Phytophthora, and Aphanomyces.
Sexual stage of a fungus.
The abnormal plant color of yellowish-white or gray condition of plant parts resulting from the incomplete destruction of the chlorophyll.
Nitrogen deficiency on this rododendron where the chlorotic leaves are the lower older leaves.
Neil Bell.
Time between infection by a pathogen and appearance of symptoms.
Softening, discoloration, and often disintegration of succulent plant tissue as a result of fungal or bacterial infection.
Carrots with cottony rot (Sclerotinia sp.).
Photo part of OSU Extension Plant Pathology Slide Collection.
The yellow color of plant parts resulting from the excessive proportion of yellow pigments, in turn produced by the underdevelopment or partial destruction of the green pigments.
The underdevelopment of any organ of a plant.
Heathy strawberry root system on the right and high nematode populations dwarfing the root systems in the middle and left.
