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作物栽培过程中,不可避免地会受到虫害的侵扰,从而导致产量降低、品质变劣。为此,确定虫害的最佳防治适期,做到适期用药,药到虫灭,才可能获得最佳的种植效益。否则,用药效果差,环境污染大。虫害的防治适期有一般性规律可循,但最主要的,应根据其发生及危害特点来具体加以确定。作物的虫害从危害方式上可分为以下五类,防治适期根据不同的危害方式确定。一、刺吸式危害1.蚜虫类。禾谷类作物蚜虫:麦蚜、高粱蚜和玉米蚜;棉蚜;菜蚜:桃蚜、萝卜蚜、甘蓝蚜;果树蚜
Crop cultivation process, will inevitably be pests infestation, resulting in lower yield, poor quality. To this end, to determine the best pest control period, so that the appropriate medication, medicine to insects, it may get the best planting benefits. Otherwise, poor medication, environmental pollution. Pest prevention and control of the general rule of law may follow, but the most important, should be based on its occurrence and the characteristics of hazards to be specifically identified. Crop pests from the hazard can be divided into the following five categories, the appropriate period of control according to different ways to determine the hazards. First, the sucking suction hazards 1 aphids. Aphids of cereal crops: wheat aphids, sorghum aphids and corn aphids; cotton aphids; aphids: aphids, turnip aphids, cabbage aphids; fruit tree aphids