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斜纹夜蛾[Prodenia litura(Fabricins)]主要危害芦笋的叶及嫩茎。一般在6月上旬始见幼虫为害,7月上旬至8月底,为害严重,高温缺雨时,为害更重。通常在芦笋茎秆分丫处产卵,每块卵有80粒以上,外覆灰黄色绒毛,幼虫孵化后,群集在浓密的嫩叶上,通常1丛笋上有几十头,多则百余头啃食笋叶及嫩茎。二至三龄后分散为害,受害严重的笋田,每丛笋常有三、四龄幼虫6、7头,多达20余头。幼虫白天多在土缝中或在浓密的枝条中,不吃不动,傍晚爬到嫩茎和叶上进行咬食,一般被害率为20—40％,严重的达90％,百丛笋中有幼虫496头,
Spodoptera litura [Prodenia litura (Fabricins)] is a major hazard to leaves and young stems of asparagus. Larvae are generally seen in early June damage, early July to the end of August, serious damage, high temperature and lack of rain, the more serious damage. Usually spawning stalks in the asparagus Ah spawning, each egg has more than 80, covered with yellowish tomentose, larvae hatch, the cluster in the dense young leaves, usually 1 cluster shoots on the dozens of heads, as many as one hundred The remaining head chewing bamboo shoots and tender stems. After the second to the third instar disperse damage, seriously injured bamboo shoots, each cluster of bamboo shoots are often the third and fourth instar larva 6,7 head, up to 20 head. Larvae in the soil during the day and more or in the thick branches, do not eat, climb to the tender stems and leaves in the evening bite, the general damage rate of 20-40%, severe up to 90% 496 larvae,