摘要
研究结果表明,在冀南地区,小麦种植面积的扩大和成熟期的延迟增加了第一代棉铃虫的虫源,从而加重了第二代棉铃虫的为害;而夏玉米、夏播棉和地膜棉的种植面积的扩大和成熟期的延迟,使二、三、四代棉铃虫大发生衔接起来,并使越冬棉铃虫基数增大,如此食料条件的衔接、改善及多年顺境的积累,是构成近年1～4代棉铃虫大面积严重发生的物质基础和重要因素.本文对综合治理对策进行了讨论.
Studies showed that enlarged planting acreage and delayed maturity of winter wheat in the sourth of Hebei increased the amount of F1 cotton bollworm and the harm to crops from F2 cotton bollworm, while enlarged acreage and delayed maturity of the summer-sowing corn, Summer-sowing cotton and plastic -sheet -covered cotton became important factors in bad attack of F2 , F3 and F4 cotton bolloworm and increased the amount of overwintering of bollworm generation. It was, therefore, the determinantive factor of wide-ranging and serious harm from F1, F2, F3 and F4 cotton bollworm that the food condition of the bollworm was improved and optimum ecologic condition was continuous in late years. The integrated control of cotton bollworm was disccussed in the paper.
出处
《华北农学报》
CSCD
北大核心
1995年第S1期120-124,共5页
Acta Agriculturae Boreali-Sinica
关键词
棉铃虫
种群数量
种植结构
作物生育期
虫害防治
Cotton bollworm
Species group amount
Crop ratio
Crop growing stage
Control of insects
