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UC Pest Management Guidelines


Leaf blotch of oats forms irregular reddish brown blotches.

Small Grains

Leaf Blotch of Oats

Pathogen: Pyrenophora avenae

(Reviewed 2/07, updated 2/07)

In this Guideline:


SYMPTOMS AND SIGNS

This disease appears as reddish tan leaf blotches that are somewhat linear with irregular margins. Heavily infected leaves die. Seedling blight may occur if coleoptiles are infected.

COMMENTS ON THE DISEASE

The fungus survives on infected, undecayed plant debris in soil or less commonly inside the hull of infected seed. The disease is favored by cool and rainy weather.

MANAGEMENT

No specific control is necessary in California. Practices that control other diseases, such as the use of clean seed, crop rotation, and elimination of crop residue, help control leaf blotch as well.

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Small Grains
UC ANR Publication 3466
Diseases
R. M. Davis, Plant Pathology, UC Davis
L. F. Jackson, Agronomy, UC Davis

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