EFFECT OF TEMPERATURE ON THE ABILITY OF COLLETOTRICHUM GRAMINICOLA TO FORM APPRESSORIA AND PENETRATE BARLEY LEAVES

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Abstract
The appressorium of Colletotrichum graminicola is a dark, spore-like body, globular, pear-shaped or irregularly lobed, with one or two small, light areas. It usually contains two nuclei. Appressoria are formed at temperatures ranging from 15 to 35 °C. They can penetrate barley leaves only at a range of 25 to 30 °C. Appressoria which are formed at 15 or 20 °C remain dormant until exposed to the higher range of 25–30 °C.

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