NGHIÊN CỨU ĐẶC ĐIỂM SINH HỌC RẦY NÂU MIỀN TRUNG VÀ KHẢ NĂNG CHỐNG CHỊU CỦA CÁC GIỐNG LÚA TRONG SẢN XUẤT

The brown plant hopper (BPH) in central region of Viet Nam was present to 1, 2, 3 biotypes. They were susceptible to biotype indicator varieties as Mudgo(Bph-1), ASD7(bph-2), ARC10550(bph-5), Swarnalata(bph-6) and T12(bph-7). In addition, the varieties are now susceptible as Babawee (bph4), Chinsapa(bph-8) and Pokkali(Bph-9) except gene Bph-3 on Rathuheenati rice variety resistant well. For cultivated varieties, there are 7 rice varieties tolerant to four subregions as AS 996, B52, Cuu Long 8, OM4668 T (RNT 9), M12, IR 7143, ML2002 CL (RNT3). Each subregion has a group of suitable resistant rice varieties such as: there are 12 varieties in Binh Thuan -Khanh Hoa.(ĐB6, 13/2, AS 996, B 52, DH 14, DH 99-81, Cuu Long 8, RNT 9 (OM4668 T), M 12, IR 7143, ML 68 T, ML2002 CL (RNT3); there are 18 varieties in Quang Nam - Quang Ngai (ĐV 108, AS 996, B52, DH 99-81, HT 7, ML 203, HT 8, ML 4, ML 49, QH 07, X 21, Cuu Long 8, OM4668 T, IR 7143, M 12, TBR 1, ML 68 T, ML2002 CL); There are 23 varieties in Binh Dinh -Phu Yen(ĐB1, ĐB6, 13/2, AS 996, B 52, DH14, HT 8, ML 203, HT 8, ML 4, ML 203, HT 8, ML 4, OM 4214, OM 4274, P 28, VD 7, X21, OM 4668 T, M 12, Cuu Long 8, IR 7143, ML2002 CL); there are 20 varieties in Hue - Quang Binh (AIT 01, AS 996, B 52, DH 815-6, DH 99-81, ML 203, HT 8, ML 4, ML 211, ML 49, ML68, QH07, SX 31, X 21, OM 4668 T, (RNT9), Cuu Long 8, IR 7143, M 12, ML 68-1, ML2002 CL).