4代棉铃虫对夏播高粱的为害特点

Damage Characteristics of the Fourth Generation of Cotton Bollworm on Summer Sowing Sorghum

4代棉铃虫对高粱的为害轻重与高粱播种茬口时间有相关性,对夏播高粱的为害重于麦套高粱。在夏播高粱茬口中,4代棉铃虫为害轻重与品种特性有相关性,对穗型紧凑型品种的为害重于穗型松散型品种。在适合的天气条件下,4代棉铃虫成虫盛期与夏播高粱扬花期相遇是其重发生的主要原因。针对4代棉铃虫在夏播高粱上的为害特点,提出了因地制宜选择合适的抗虫品种、提早播期的农业防治措施。

There was a correlation be- tween the damage degree of the fourth generation of cotton bollworm on sorghum and sorghum sowing time of various crops for rotation, and the dam- age degree of the fourth generation of cotton bollworm on summer sowing sorghum was higher than that on the in- terplanting sorghum with wheat. In the crop for rotation of summer sowing sorghum, there was a correlation be- tween the damage degree of the fourth generation of cotton bollworm and the variety characteristics, and the damage degree of the fourth generation of cotton bollworm on the compact panicle type of sorghum was higher than that on the loose panicle type of sorghum. The main reasons for heavy occurrence of the fourth generation of cotton bollworm were the adult stage meeting the blooming stage of summer sowing sorghum under suitable weather conditions. Based on the damage characteristics of the fourth gen- eration of cotton bollworm on summer sowing sorghum, the agricultural control measures were put forward, including selecting insect-resistant varieties, advancing sowing date.