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棉铃虫综合防治是方向,而药剂防治仍是目前防治的重要手段。如何使农药在防治棉铃虫时充分发挥作用,必须抓住以下关键措施: 1.掌握最佳用药时机 棉铃虫幼虫孵化后第2天就为害棉花生长点,幼虫在孵化后4天内对农药最为敏感。随着龄期增大,耐药、抗药性增强。各代的防治指标也不同。通常以卵量为标准,如第2代百株棉累计卵量100粒或初卵幼虫20头以上,第3第4代百株棉卵累计25粒或初卵幼虫5
The comprehensive prevention and control of cotton bollworm is the direction, while the prevention and control of medicaments is still an important method of prevention and cure. How to make pesticides play a role in the prevention and treatment of cotton bollworm, we must seize the following key measures: 1. Master the timing of the best use of cotton bollworm larvae 2 days after hatching on the cotton growing point, the larvae most sensitive to pesticides within 4 days after hatching . As the age increases, resistance, enhanced drug resistance. Prevention and control indicators of different generations are also different. Usually based on the amount of eggs, such as the second generation of 100 cotton accumulated eggs or early egg larvae more than 20, the third fourth generation of a total of 100 cotton eggs 25 or egg larvae 5