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大豆食叶性害虫主要有大豆造桥虫及豆天蛾。大豆造桥虫的优势种是银纹夜蛾和大豆小夜蛾,长须夜蛾、云纹夜蛾等也造成一定的为害。过去所提大豆造桥虫的防治指标是一个混合概念,豆天蛾尚无统一的防治指标。为判定更为科学的化学防治指标,于1984年以来,对银纹夜蛾、大豆小夜蛾和豆天蛾幼虫为害损失和防治指标进行了研究,通过5年的试验研究,拟定出了不同产量水平下,几种食叶性害虫混合发生时的防治指标。本防治指标是根据经济允许损失率,通过实验分析而制订出的。其方法是,首先根据
Soybean leaf-eating pests mainly soybean bridge worms and bean moths. The dominant species of Soybean bridge insect are Spodoptera Sinensis and Soybean Spodoptera, Spodoptera litura, Tendulina velutipes and other also caused some damage. In the past, the prevention and cure index of the bridged bridge insect of soybean was a mixed concept. There was no unified prevention and control index of the bean moth. In order to determine more scientific indicators of chemical control, since 1984, the damage and control indicators of S. litura, S. japonicum and L. moth larvae were studied, and five years of experimental studies were used to draw out different Yield levels, the number of leaf-eating pests control the occurrence of mixed indicators. The prevention and control index is based on the economic allowable loss rate, through experimental analysis and formulated. The method is based first