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Hypoplasia The underdevelopment of cells, tissues, or organs. ...

Immunity A relationship between a plant and a causal agent in which the plant does not become diseased. ...

Incubation Period Time between infection by a pathogen and appearance of symptoms. ...

Indexing Determining presence of disease in a plant by removing buds or other parts for inoculation of a susceptible indicator plant that exhibits specific symptoms of a transmissible disease. ...

Infection Process in which a pathogen enters, invades, or penetrates and establishes a parasitic relationship with a host plant. ...

Infestation Presence in numbers (e.g., of insects, mites, or nematodes). Do not confuse with "infection," a term that applies only to living, diseased plants or animals. ...

Inoculum Pathogen or pathogen part (e.g., spores, mycelium) that infects plants. ...

Intercellular Between the cells. ...

Intracellular Within the cells. ...

Klendusity 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). ...