湖北高海拔地区性信息素对小菜蛾的诱捕和防治效果

2002年应用性诱剂对海拔1 200 m山区甘蓝田小菜蛾的发生及防治进行了研究。在第一茬蔬菜生长期有2个诱蛾高峰，诱蛾量(头/盆)分别为11.7±2.4和9.2±1.0；第二茬蔬菜生长期有3个诱蛾高峰，诱蛾量(头/盆)分别为70.9±8.0、16.1±2.5和11.1±1.9。应用性诱剂诱捕山区甘蓝田小菜蛾时，第一茬田间蛾密度与单盆诱捕量相关性不显著，而第二茬菜生长期田间蛾密度与单盆诱蛾量相关性显著(y=0.0116x+0.1614, r=0.9213， P=0.0011)。性诱剂在光期与暗期都可诱到小菜蛾雄虫, 没有明显的诱蛾高峰。应用性诱剂可以使菜田的农药使用减少3～5次，降低田间子代幼虫密度。

Mass trapping and control efficacy on the diamondback moth, Plutella xylostella (L.) with synthetic sex pheromone lures at high altitudes in Hubei

The effects of synthetic sex pheromone lures in controlling the diamondback moth, Plutella xylostella (L.) (DBM) were assayed at high altitudes(about 1 800 m) in Hubei in 2002. The results showed that there were two peaks in first crop of cabbage, with moth catches being 11.7±2.4, and 9.2±1.0 per trap, respectively; in second crop of cabbage there were three peaks, with the moth catches being 70.9±8.0, 16.1±2.5, and 11.1±1.9 per trap, respectively. In the second crop, the correlation between moth density and moth catches per trap was significant, y=0.0116x+0.1614 (r=0.9213, P=0.0011). Use of synthetic sex pheromone lures could decrease the number of DBM moths and reduce insecticide applications.