THE INFECTION COURT OF FABA BEAN SEEDLINGS FOR OOSPORES OF PERONOSPORA-VICIAE F-SP FABAE IN SOIL

The infection court of Faba bean seedlings for oospores of Peronospora viciae f.sp. fabae in soil was determined. Soil naturally infested wi th oospores was placed as 3-cm thick layers at four different depths r elative to Faba bean seeds. Seedlings with downy mildew were obtained only from seeds sown in the middle of a 3-cm layer of oospore-infested soil. No infection was obtained from oospore-infested soil placed mor e than 1.5 cm above or below seeds. Histological observations showed t hat the hypocotyl and first part of the main root were the most probab le sites of infection.