Alternate host: A second host species required by some rusts and other organisms to complete their life cycle.

Chlorosis: Yellowing or whitening of normally green plant tissue.

Coalesce: To combine, to fuse or come together.

Conidiophore :A threadlike stalk upon which conidia (spores) are produced.

Conidium (pl. conidia) : Any asexual spore formed on a conidiophore.

Diapause :A period of dormancy

Exudate:  Gel-like accumulation of spores orbacterial ooze.

Foot rot : Disease symptoms, such as discoloration, necrosis and decay, affecting the roots                         and basal portions of the plant or culm.

Gall :A localized proliferation of plant or parasite tissue that produces an abnormal growth or swelling, usually caused by pathogenic organisms, nematodes, or insects.

Honeydew : A sticky exudate (containing conidial)  produced during one stage of the life cycle of Claviceps purpurea.

Hypha (pl. hyphae)  :  A tubular, threadlike filament of fungal  mycelium.

Immune: Not affected by pathogens.

Inoculum :Spores or other diseased material that may cause infection.

Lesion: A visible area of diseased tissue on an infected plant.

Mosaic :A pattern of disease symptoms displaying mixed green and lighter colored patches.

Mycelium (pl. mycelia):A mass of hyphae that form the body of a fungus.

Necrosis: Death of plant tissue, usually accompanied by discoloration.

Pathogen :A microorganism that causes disease.

Primary: Spores or fragments of a mycelium 

inoculum :capable of initiating a disease.

Pustule :A spore mass developing below the epidermis, usually breaking through at                   maturity.

Resistance : Inherent capacity of a host plant to prevent or retard the development of an                        infectious disease.

Sclerotium : A dense, compact mycelial mass capable(pl. sclerotia) of remaining dormant for extended periods.

Senescence :The phase of plant growth that extends from full maturity to death.

Spore : A minute reproductive unit in fungi and lower plant forms.

Sporulation: The period of active spore production.

Striate : Displaying narrow parallel streaks or bands

Susceptible: Being subject to infection or injury by a  pathogen; non-immune.

Symptom: A visible response of a host plant to a  pathogenic organism.

Telium  (pl. telia) :Postule containing teliospores.

Teliospore: A thick-walled resting spore produced by rust and smut fungi.

Tolerant : The ability of a host plant to develop and reproduce fairly efficiently while                         sustaining disease.

Transmission : The spread of a disease agent among individual hosts.

Urediospore :An asexual spore of the rust fungi.

Vector : An organism capable of transmitting inoculum.

Virulence :The relative ability of a microorganism to overcome the resistance of a host.

Water soaked : Appearing wet, darkened, and partially transparent.

Courtesy USDA

 

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