两种药剂亚致死浓度对麦长管蚜实验种群参数的影响

为明确阿维·吡虫啉和氯氟·吡虫啉两种复配制剂对麦长管蚜Sitobion miscanthi种群数量动态的影响,采用生命表技术分别研究了两种药剂亚致死浓度LC10、LC30对麦长管蚜F0代和F1代生长发育及种群参数的影响.结果 表明,阿维·吡虫啉和氯氟·吡虫啉LC10、LC30处理后,与对照相比,麦长管蚜F0代成蚜寿命和...

Effects of sublethal concentrations of two pesticides on the population density of Sitobion miscanthi

In order to evaluate the effects of sublethal concentrations of abamectin·imidacloprid and beta-cypermethrin·imidacloprid on the population density of Sitobion miscanthi, life-table analyses of the growth, development and population density of S.miscanthi F0 and F1 generations were conducted. The results showed that the fecundity and average lifespan of S.miscanthi F0 generation were significantly (P<0.05) lower than the control. The lowest average lifespan (7.98 d) and fecundity (12.58 heads) were observed in the beta-cypermethrin·imidacloprid (LC30) treatments. The LC10 and LC30 treatments with abamectin·imidacloprid and beta-cypermethrin·imidacloprid shortened the average lifespan of F1 generation by 4.85 d, 8.47 d, 6.03 d, and 9.28 d, respectively. The fecundity was also reduced by 35.85%, 55.47%, 40.04%, and 59.52%, significantly (P<0.05) lower than the control. The survival rate of F1 generation decreased from the 12th day. Moreover, the sublethal concentration effect of each treatment increased the developmental duration, population doubling time (Dt), but innate rate of increase (rm), net reproductive rate (R0), average generation time (T), the finite rate of increase of the F1 generation, and gross reproduction rate (GRR) were reduced. These results indicated that the sublethal concentrations of abamectin·imidacloprid and beta-cypermethrin·imidacloprid could significantly inhibit the population density of S.miscanthi.