GrainGenes Pathology Report: Powdery Mildew

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Pathology	Powdery Mildew
Type	Fungus
Host Species	Triticum aestivum Hordeum vulgare Avena sativa
Causal Organism	Erysiphe graminis
Trait	Wheat reaction to powdery mildew
Evaluation	Powdery mildew, ISWYN24 Powdery mildew, Nelson96
Gene Class	Reaction to Erysiphe graminis DC.
Resistance Gene	Pm21 (Triticum) [ Show all 58 ]
Resistant Allele	Mla3 (Hordeum) [ Show all 113 ]
Resistant Line	Igri (barley) Franka (barley) H. spontaneum 1B-87
Symptoms	Attacks foliage and heads of wheat grown under irrigated and high rainfall conditions. White, cottony patches initially form on upper surfaces of lower leaves that can spread to all aerial portions of the plant. Patches turn dull gray or brown with age and develop dark fruiting bodies that appear as dark specks. Dense stands, heavy nitrogen fertilization, lush growth, high humidity and cool temperatures favor disease development. Persists from season-to- season on infested wheat residue.
Image	[ Hide all but 1 of 13 ] Patches of powdery mildew... White tufts of fungus mycelium... Hyphae of Erysiphe graminis on rye. Powdery mildew on wheat,... The superficial mycelium and fruiting structures... Conidia of E. graminis (10x40). Cleistothecia of E. graminis... Immature asci are released... Powdery mildew attack on barley. Powdery mildew on barley... Powdery mildew on wheat... Powdery mildew attack of wheat spikelets. Powdery mildew symptoms
Reference	Kephart KD (1993) Winter wheat disease management Insect and plant disease management handbook. (1987) Compendium of wheat diseases. (1982) Compendium of barley diseases.