NGHIÊN CỨU, ĐÁNH GIÁ KHẢ NĂNG CHỐNG CHỊU CỦA MỘT SỐ GIỐNG LÚA THUẦN VÀ LÚA LAI ĐỐI VỚI BỆNH BẠC LÁ Ở TỈNH VĨNH PHÚC

Bacterial leaf blight cause by Xanthomonas oryzae pv. Oryzae is a destructive disease of rice in Vietnam. Evaluating for resistance of rice varieries to disease has become one of the important issue. The results of screening for resistance of different rice varieties, including 8 conversional and 14 hybride rice varieties to bacterial leaf blight showed that: After 18 days of inoculation, the average disease index was not high. However, after 28 days, most varieties were heavily infected. The VD isolate caused severe infection than VT and VY isolates. The results of screening showed that after 28 days of inoculation, the disease index of some conversional rice varieties (HT6, LT6 and DT45) was lowest among 8 tested varieties and belong to moderate susceptible (with disease index in green house was from 4.60 to 6.87, in the the field was from 6.54 to 7.17). For hybrid rice, after 28 days of inoculation, the disease index of HYT102, HYT108, HYT115, HYT117 was lowest among 14 tested varieties and belong to moderate susceptible (with disease index in green house was from 2,0 to 5,73, in the the field was from 5,92 to 6,22) Base on this results, it is recomended to use some resistance varieties (HT6, LT6, and DT45, HYT102, HYT108, HYT115, HYT117) as genetic material for breeding and selection of bacterial resistance rice varieties for Vinh Phuc province.