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多年观察,安庆沿江两熟套作棉区,由于栽培管理精细,在棉株的某些生育阶段,能耐受较重虫害而不减产。因此,充分利用棉株耐害补偿能力,可以进一步放宽化防指标,减少化学农药施用量。一、棉花苗期补偿能力最强。1980年春季寒流频繁,前作物及早春寄主上蚜量锐减,影响了天敌群落的建立。
Years of observation, Anqing along the Yangtze double cropping cotton area, due to fine cultivation and management, in some cotton plant growth stages, can withstand heavier pests without reducing production. Therefore, taking full advantage of cotton plant tolerance compensation ability, we can further relax the chemical prevention indicators and reduce the chemical pesticide application. First, the strongest cotton seedling compensation. In the spring of 1980, frequent cold spells and sharp drop in the amount of aphids on the former crops and early spring affected the establishment of natural enemy communities.