地膜棉田一代红铃虫的发生特点及田间消长动态

Occurrence characteristic and population dynamics of first generation pink bollworm in cotton fields with film mulching

经对１９８６～１９９５年田间系统调查数据的分析研究结果表明，地膜棉一代红铃虫较露地棉发生期早，发生时间长；发生量大，发生程度重；年际间变幅大。在重、中、轻３种年型中，地膜棉一代红铃虫无论在哪一时段，其卵量均高于露地棉田；田间发生消长峰谷明显，第一次卵峰来得早，来势猛，且有多次卵峰出现。３种年型地膜棉一代红铃虫最高卵峰卵量分别为露地棉田最高卵峰卵量的５９、２９和１３倍。

Based on the data of systematic investigation from 1986 1995,the occurrence characteristic and the population dynamics of the first generation pink bollworm were studied.The results showed that the occurrence of the first generation pink bollworm was earlier,and it also lasted longer periods,the egg's numbers of the first generation pink bollworm were greater in cotton fields with film mulching than without it during the all periods of occurrence.The occurrence of growth decline was significant in cotton fields with film mulching.The first peak date of egg deposition was earlier,and the peak of egg was more than one time.The peak numbers of egg in cotton fields with film mulching respectively was 5 9 times,2 9 times and 13 times as many as that without it in the occurrence of light,middle and heavy degree.