Cross infectivity of Bipolaris sorokiniana among wheat, barley, triticale, rye and Phalaris minor

Thirty different isolates of Bipolaris sorokiniana were obtained from infected leaf samples of bread wheat, durum, barley, triticale and rye leaves collected randomly from Abohar, Gurdaspur, Ludhiana and Fazilka areas of Punjab state. Cross infectivity of all these isolates was studied on 13 different varieties of bread wheat, barley, durum, triticale and rye along with weed host Phalaris minor at seedling stage under poly-house conditions. All the isolates showed positive cross infectivity on hosts other than their original hosts. Most of the isolates obtained from barley were generally less virulent on most of the wheat varieties exhibiting MR to R reaction except variety sonalika where the reaction was MS to S. Isolates from bread wheat were relatively more virulent on barley cultivars exhibiting MS to S infection types. Isolates from triticale exhibited MR to S reaction on different hosts. Isolates from durum and rye were highly virulent to all hosts exhibiting MS to S reaction