褐稻虱生物型的监测和控制对策

广西等11个省、市、自治区的褐稻虱Nilaparvata lugens(Stal)生物型监测表明：我国目前除成都的褐稻虱属生物型1外，其他均以生物型2为优势种群。还发现云南思茅和广 西南宁的褐稻虱有部分个体可致害含抗性基因bph2的ASDT和IR36。并鉴定选出一些抗生物型2的品种可供目前推广使用。尚发现广西药用野稻绝大多数材料、普通野稻部分材料以及国际水稻抗褐稻虱圃中Ptb33及其衍生品种(系)具有广谱抗性。若用以培育具广谱抗性的新品种，则是控制褐稻虱新生物型产生和暴发为害的一个重要对策。

THE BIOTYPES OF BROWN PLANTHOPPER[NILAPARVATA LUGENS (STAL)-] WITH A VIEW TOITS CONTROL

Results of the present study indicate that the dominant biotype of the brown plantbopper (BPH) occurred in the 11 Provinces and Autonomous Region of China has changed from biotype 1 to biotype 2 except in Chengdu, Sichuan. Some individuals of BPH collected in early rice at Simao, Yunnam and Nanning, Guangxi were found to be the same as that of Bangladesh and Sri Landka. They could demage the varieties whichcontained the genes Bphl and bph2. Some local varieties and accessions are resistant to biotype 1 and 2 that should be extended for utilization. Most accessions of Oryzae officinalis Wall and the varieties (lines) derived from Ptb33 showed a broad spectrum resistance for cross breeding to control the demage by new biotypes.