Pyrenophora leaf spot

Pyrenophora avenae

Pyrenophora avenae Ito et Kurib. - Helminthosporium leaf spot of oats.

Biological group

Hemibiotroph.

Morphology and biology

Helminthosporium (red-brown) leaf spot is caused by the fungus Drechslera avenae (Eidam) Scharif. (= Helminthosporium avenae Eidam) - asexual stage of Pyrenophora avenae. It is a common disease of oats and may occasionally attack species of Hordeum, Koeleria and Arrhenatherium. Sexual stage Pyrenophora avenae Ito et Kurib. form in the spring on crop debris (Nikitina & Polozova, 1990). Disease attacks leaves and kernels of oats.

Ecology

The fungus is the common causes of seedling blights of oats in different climatic zones. Some factors, such as freezing, herbicide injury, nutrient deficiency, or infection by other pathogens may result in the disease development. Rains and moist, humid periods favor disease infestation because spores germinate at temperatures of 10-20 degrees centigrade and 100% humidity

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