论文部分内容阅读
四川棉区是特殊的南方型早熟棉区,一般年份3月中下旬即可稳定通过15℃,有利于棉花早播早发,为棉蚜等常发性害虫的为害提供了有利条件,对棉花产量影响极大,给防治工作带来困难,为了进一步提高测报水平,及时提供棉虫综防虫情信息,需要在弄清棉蚜发生为害规律和影响因子异同的基础上,科学划分不同类型的预测预报区,并制订出相应的资料统计标准。一、区划方法及结果: 棉蚜种群在时空地域系统之间,存在着实际差异。这种区间的差异性与气候条件、作物布局、栽培技术、产量水平、人类活动等因素密切相
Sichuan cotton area is a special southern precocity cotton area, which can be stabilized at 15 ℃ in the middle and late of March. It is conducive to early sowing of cotton and provides favorable conditions for the damage of cotton pests such as cotton aphid. In order to further improve the level of reporting and provide information on the control of insects and insects, it is necessary to make a scientific classification of different types of predictions based on the understanding of the similarities and differences between the damage rules and the influencing factors of cotton aphids, Forecast area, and formulate the corresponding statistics standards. First, the zoning methods and results: cotton aphid population in the spatial and temporal systems, there are practical differences. The differences in this interval are closely related to climatic conditions, crop layout, cultivation techniques, yield levels, human activities and other factors