大面积应用性信息素诱捕甘蓝斜纹夜蛾及田间控害效果

2006年应用性信息素大量诱捕法对秋甘蓝斜纹夜蛾开展了大面积诱杀试验，并就配套应用技术及其田间控害效果进行了评估。性信息素防治区内，在外围、中围和内围以及上风口、下风口等不同点位上的斜纹夜蛾雄成虫的单瓶诱集量差异明显，上风口的诱集量大于下风口，且增加幅度从外围往中心依次递减；在不同点位上的斜纹夜蛾雄成虫的诱集量差异跟田间虫口发生量呈正相关，虫口密度越大，外围成虫诱集量比中内围的增幅也越大。性信息素防治区在减少药剂防治2次的情况下，斜纹夜蛾落卵量比化防区和空白对照区分别减少27.5%和65.3%，田间累计幼虫发生量分别下降70.9%和94.3%。本试验结果表明，性信息素大面积诱捕能有效控制甘蓝斜纹夜蛾的危害，可为蔬菜的可持续生产提供技术支持。

Large scale application of mass trapping of Spodoptera litura with sex pheromone and evaluation of its control efficiency in the cabbage field

Large scale application of mass trapping of Spodoptera litura by sex pheromone and its control efficiency in the cabbage field were studied in 2006.The number of S. litura moths captured per trap was different in the locations of outer, middle and inner cycles. The number of moths captured at the upwind side was higher than that at downwind side, and the rate of increase from the outer to the center gradually dropped down. The number of moths trapped at different locations was related to the size of pest populations.The larger the density of population was, the higher the rate of increase from the outer to inner showed. When 2 times less than normal pesticide usages were applied in the pheromone treated area, the egg numbers were decreased by 27.5% and 65.3%, compared with those in the control areas, and the larvae numbers were also decreased by 70.9% and 94.3%, respectively. It therefore indicated that a larger area of trapping with sex pheromone could effectively control the hazards of S. litura in the cabbage field and provide technical support for sustainable production of exporting vegetables.