烟粉虱在不同寄主作物上的种群动态及化学防治

20 0 1年在河北省廊坊市研究了烟粉虱Bemisiatabaci(Gennadius)在主要寄主作物棉花、大豆、花生和玉米上的种群动态和化学防治方法。研究结果表明 ,烟粉虱的种群数量在寄主的生育期内持续增长 ,在 8月 2 2日左右达到高峰 ,之后逐渐减少。烟粉虱虽然寄主范围广泛 ,但在每种寄主上的发生量并不一致 ,调查结果表明烟粉虱在 4种不同寄主上的种群数量比较为 :棉花 >大豆 >花生 ,玉米上没有发现烟粉虱的卵及若虫 ,只有极少量的成虫在植株上逗留。在药效试验中 1 0 %吡虫啉WP、2 5 %扑虱灵WP和 1 0 %高效氯氰菊酯LC在厂家推荐浓度下对烟粉虱成虫的防治效果分别为 2 0 0 7%～ 3 3 1 9% ,2 0 62 %～ 44 88%和 4 0 5 %～ 6 78% ;对若虫的防治效果分别为 5 1 91 %～ 64 46% ,5 4 3 0 %～ 63 99%和 1 6 73 %～ 2 6 97%。

Pooulation dynamics of Bemisia tabaci on different host plants and its chemical control

The population dynamics of Bemisia tabaci (Gennadius) on cotton, soybean, peanuts and corn, and its chemical control were preliminarily investigated in 2001 in Langfang City, Hebei Province. The results indicated that during growing stage of hosts, the population of Bemisia tabaci increased continually and up to a peak around on 22nd August, then gradually decreased. There were significant differences among the population densities of Bemisia tabaci on different hosts, the order of density was cotton > soybean > peanuts > corn. Only a few adults but no eggs and nymphs were found on the corn plant. Three insecticides, imidacloprid, buprofezin and beta cypermethrin were applied to control the pest, their effects for adult and nymphs were ranged from 20 07% to 33 19%, 20 62% to 44 88% and 4 05% to 6 78%; 51 91% to 64 46%, 54 30% to 63 99% and 16 73% to 26 97%, respectively.