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随着蔬菜种植面积的不断扩大，保护地反季节栽培日益普遍，复种指数高，菜田多样化品种为害虫周年提供丰富的寄主，加剧了害虫的发生，加大了防治难度。如1996～1998年夏秋季节斜纹夜蛾爆发，虽及时引进新型生物农药除尽、米满等防治，有效地控制了两种夜蛾害虫的为害〔1〕，但
With the continuous expansion of vegetable planting area, the counter-seasonal cultivation of protected areas is increasingly common, and the multiple cropping index is high. The diversified varieties in the vegetable fields provide abundant hosts for pest annulments, exacerbating the occurrence of pests and increasing the difficulty of prevention and treatment. As the outbreak of Spodoptera litura in summer and autumn from 1996 to 1998, the control of two kinds of insect pests was effectively controlled although the introduction of new biopesticides,