河西走廊荒漠草原白刺夜蛾生活习性及防治研究

为防制白刺夜蛾危害固沙植物白刺,保持河西走廊荒漠草原生态平衡,观察白刺夜蛾(Lei-ometopon simyrides Staudinger)害虫生活习性和天敌,观察显示白刺夜蛾在河西走廊荒漠草原上,1年发生3代,以蛹在土中越冬,主要以白刺(Nitraria spp)为食,幼虫期是其主要危害期。在干旱的荒漠草原上,6~8月3个月的平均降雨量超过38 mm,白刺生长茂盛,有利于白刺夜蛾幼虫的生长发育,使害虫数量大爆发,反之虫口密度急剧降低。不难得出最佳防治时间是每年的5月下旬至6月上旬。要充分利用和保护天敌以维持荒漠草原的生态平衡。

Study on Life Habit and Control of Desert Steppe Leiometopon Simyrides Staudinger in Hexi Corridor

In order to prevent leiometopon simyrides staudinger from harming sand consolidaton plant nitraria,and keep ecological balance of desert steppe in Hexi corridor,life habit and natural enemy of leiometopon simyrides staudinger were observed.The observation showed that 3 generations were happened each year,pupae were in the earth through the winter,nitraria as major food,the major harm period is the larval stage.In the dry desert steppe,average monthly rainfall exceeded 38 mm from June to August,nitraria grew flourishing,it is good for leiometopon simyrides Staudinger larva to grow up,the amount of pest insects were breathtaking.On the contrary,density of insect quantity reduced sharply.Hence,it is not difficult to conclude that the best control time is from late May to early June.Therefore,it is necessary to fully utilize and protect natural enemy to maintain ecological balance of desert steppe.