褐飞虱的再迁飞能力

摘要

Re-emigration potential of the brown planthopper (BPH),Nilaparvata lugens after an emigration and feeding different resistant varieties was simulated. Tethered flight of brown planthopper on a set of computerized flight mill revealed that the natural population of BPH in the rice cropping areas of the lower reaches of Yangtze River consisted of individuals with different flight characteristics, i.e., deposited type (flying less than 20 min), migratory type (flying more than 20 min, MT), strong migratory type (flying more than 160 min, SMT) and re-emigration type (2nd flying more than 20 min, RET). The flight capability and the differentiation of the MT of BPH was influenced significantly by the nutritive conditions. The individuals feeding on the sensitive varieties at heading stage would show a lower ratio of MT, but a stronger ability of migration and re-emigration among their MT individuals. The RET rate would be increased markedly by keeping apart the females, and the SMT individuals would display higher performance of re-emigration. There would only be 0.84 and 4.9 percent of the RET BPH among the natural populations and MT individuals respectively.%通过室内模拟试验研究了褐飞虱经过一次远迁降落、取食不同食料后的再迁飞能力。根据吊飞试验测得的飞行能力可将褐飞虱种群分为居留型（小于20min）、迁飞型（20min以上）、强迁飞型（160min以上）和再迁飞型（二次吊飞飞行20min以上）。不同营养条件对褐飞虱的飞行能力和迁飞型的分化有显著影响，早期营养条件好（取食穗期感性水稻品种）的迁飞型比率较低，但迁飞型个体的飞行能力和再迁飞能力均较强。未交配能显著提高再迁飞型比率。自然种群中褐飞虱再迁飞型比率仅占0.84%，吊飞一次后的迁飞型个体再次吊飞时的再迁飞型比率为4.9%，且强迁飞型个体具有较强的再迁飞能力。