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采用诱捕率指标,评价了田间不同成虫密度下,性诱剂诱捕器不同放置密度对小菜蛾种群的诱捕效果。结果表明,在放置性诱剂后的前6d内诱捕作用较小,其后诱蛾效果不断增强,第10～15d出现诱蛾高峰,20d后显著下降。在田间小菜蛾成虫不同密度下,诱蛾效果随诱捕器数量的增加而加强。当诱捕器放置密度相同时,诱蛾量随菜蛾密度的升高而增加,诱蛾率在高密度下反而下降。同时,性诱剂可有效地减少小菜蛾的田间落卵量,第6～12d开始卵量下降,15～21d后落卵量降至最低。与对照菜田相比,其落卵量可减少17.85%～72.19%。
The trapping rate index was used to evaluate the trapping effect of different attractant trapping density on the population of Plutella xylostella under different adult density. The results showed that the trapping effect was less in the first 6 days after the placement of the lure, and the effect of the lure was enhanced afterwards. The peak of the lure was observed on the 10th to 15th days and decreased significantly after 20 days. Under the different density of adults of Plutella xylostella, the moth effect was enhanced with the increasing number of traps. When the traps were placed at the same density, the amount of moths increased with the increase of moth density and the moth rate decreased at high density. At the same time, sex lure could effectively reduce the amount of eggs laid in the field of Plutella xylostella, and the number of eggs decreased from the 6th to the 12th day. The amount of eggs dropped to the lowest after 15 ~ 21 days. Compared with the control field, its egg yield can be reduced by 17.85% ~ 72.19%.