论文部分内容阅读
菊酯类农药对水稻螟虫有优异的防治效果,但引起稻飞虱的更大发生。作者用溴氰菊酯、氰戊菊酯及对稻飞虱高效的噻嗪酮等杀虫剂和对稻飞虱不同抗感水平的水稻品种组成不同的化学、品种环境,系统观察稻飞虱种群动态差异。结果表明,同一水稻品种,不同农药,稻飞虱种群增长量不一样。同一农药,不同水稻品种,稻飞虱的发生亦不同。溴氰菊酯或氰戊菊酯用到感虫品种上,有利因子重叠,稻飞虱的发生量最大;用到中抗品种上,有利因子与不利因子重叠,有效地抑制稻飞虱种群的增长。先将溴氰菊酯喷洒到感虫品种上,10天后再用噻嗪酮,两个有利因子重叠后再加一不利因子,仍可控制稻飞虱的为害。
Pyrethroid pesticides have excellent control effects on rice stem borers, but cause greater occurrence of planthoppers. The authors used deltamethrin, fenvalerate and buprofezin efficient buprofezin and other insecticides and rice planthopper different resistance levels of rice varieties of different chemical composition of the species environment, systematic observation of planthoppers Differences in population dynamics. The results showed that the same rice varieties, different pesticides, rice planthopper population growth is not the same. The same pesticide, different rice varieties, planthopper occurrence is also different. Deltamethrin or fenvalerate used in the susceptible varieties, the overlapping of favorable factors, the largest occurrence of planthoppers; use of medium resistant varieties, favorable factors and unfavorable factors overlap effectively inhibit planthopper population increase. First, deltamethrin sprayed on the susceptible varieties, 10 days after the buprofezin, two favorable factors after the overlap plus a negative factor, can still control the planthopper damage.