不同生境中稻飞虱种群动态研究

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。

PRELIMINARY STUDY ON THE POPULATION DYNAMICS OF RICE DELPHACID IN DIFFERENT ECOLOGICAL ENVIRONMENT ADJUSTED BY INSECTICIDES AND RICE VARIETIES

The deltamethrin and fenvalerate had showed effective in rice stem borers control, but these two synthetic pyrethroids caused the resurgance of the rice delphacids (a mixed population of brown planthopper, Nilaparvata lugens, and white backed planthopper, Sogatella furcifera). In this study, insecticides, including deltamethrin, fenvalerate and applaud, and rice varieties, including 88122 (a middle resistant rice variety to rice delphacid) and Xiushui 04 (a susceptible rice variety to this pest) were used to integrate different chemical and rice variety circumstances. Observations were made every 5 days in a field test with 3-replications indicated that in the environment consisted of Xiushui 04 and deltamethrin or fenvalerate, the population of rice delphacid was the largest, in the environment consisted of 88122 and two pyrethroids, the increase of the population of the pest was repressed, and in the environment in which Xiushui 04 was planted and deltamethrin was spraied, and then, applaud was used, the rice delphacid was controlled very well.