INTERCEPTION OF DOWNY MILDEW (PERONOSPORA MANSHURICA (NAUMM.) SYD.) IN WILD SOYBEAN (GLYCINE SOJA SIEB. AND ZUCC.)

Abstract

Three hundred and four accessions of wild soybean strains (Glycine spp.)
were received from USDA-ARS Urbana, Illinois in June, 1996 for quarantine
clearance. On microscopic examination two accessions viz. PI-483464-B and
PI-423999-A were found to carry dull milky white to pale-brown crust of
oospores of downy mildew (Peronospora manshurica (Naum.) Syd.). Further
information collected from GRIN (U.s.A.) revealed that PI-483464-B is a strain
of Glycine soja Sieb. and Zucco and was donated by Chinese Academy of
Agricultural Sciences in 1984; PI 423999-A also belongs to G. soja, and was
donated by N.!. Vavilov All Russian Scientific Research, Russian Federation,
in 1976. Both the accessions are reported to be highly susceptiple to Soybean
Mosaic Virus (SMV).