Immune: can not be infected by a pathogen

Imperfect fungus: an asexually producing fungus that may or may not prodcue sexual spres (telemorph stage)

Imperfect stage: the asexual stage of the life cycle of a fungus

Incubation period: the period of time between penetration of a host by a pathogen and the first appearance of disease symptoms and/or signs on the host

Infection: process of entering or establishment of a pathogen within a host

Injury: damage caused by animal, physical or chemical means

Inoculate: to artifically introduce a pathogen to a host to induce disease

Inoculum: the pathogen or its parts used for the purpose of inducing disease in a host

Intergrated pest management: attempt to prevent or control diseases and pests of a crop using all available means for the best control results at the lowest cost and least damage to the environment

Intercellular: between or among cells

Intracellular: inside or through cells

Invasion: spread of a pathogen into the host

In vitro: in culture, outside the host

In vivo: in the host

Isolate: a single spore or culture and the subcultures derived from it

Latent infection: stage of disease cycle in a which the host is infected with a pathogen but does not show symptoms

Leaf spot: a self-limiting necrotic lesion on a leaf

Life cycle: the stage or successive stages in the growth and development of an organism that occur between the appearance and reappearance of the same stage of the organism

Local lesion: a localized spot produced on a leaf upon mechanical inoculation with a virus

Masked symptoms: virus-infected plant symptoms that are absent under certain environmental conditions but appear when the host is exposed to certain conditions of light and temperature

Mildew: a fungal disease of plants in which mycelium and spores of the fungus are seen as a whitish growth on the host surface

Mold: any profuse or woolly fungus growth on damp or decaying matter or on surfaces of plant tissue

Monocyclic: having one cycle per season

Mosaic: symptom of certain viral diseases of plants characterized by intermingled patches of normal and light green or yellowish color

Mottle: an irregular pattern of indistinct light and dark areas

Mummy: a dried shriveled fruit

Mutant: an individual possessing a new, heritable characteristic as a result of a mutation

Mycelium: the hypha or mass of hyphae that make up the body of a fungus

Mycoplasmas: pleomorphic prokaryotic microorganisms that lack a cell wall

Mycorrhiza: a symbiotic association of a fungus with the roots of plant

Mycotoxins: toxic substances produced by some fungi often found in infected seeds, feeds, or foods and capable of causing illness or death to animals and humans that consume them