PREDISPOSITION TO SEPTORIA LEAF BLOTCH IN OATS AFFECTED BY BARLEY YELLOW DWARF VIRUS

Abstract

This study was conducted to measure the effect of field inoculations of Septoria avenae and BYDV on disease symptoms, grain yield, 1,000-kernel weight, percent hull and plant height of three oat cultivars having different types of disease reactions. Our data show that S. avenae contributed to a yield loss of 8.9% in insecticide-treated plots, and 18.4% in BYDV-inoculated plots, on the average of three cultivars. Similar effects on leaf symptoms, 1,000-kernel weights and percent hull concur to indicate that BYDV predisposes oat plants to heavier damage by septoria leaf blotch.