槐尺蛾卵期及幼虫期的预测预报

Fecasts of Oviposition Stage and Larva Period of Somiothisa Cinerearia Bremer et Grey

槐尺蛾是园林重要绿化树之一的国槐、龙爪槐最大食叶害虫，既食尽叶片影响观赏价值和绿化成果，又排泄大量粪便和吐丝下垂，有碍市容市貌．该虫发生世代多，准确预报各代幼虫发生期，则是防治的关键．经多代饲养研究测定卵期C＝10.39±0.84（℃），K＝67.57±3.03（DD）；幼虫期C＝9.16±0.42（℃）,K＝241.26±5.21（DD）．其结果符合实际发生情况.

Semiothisa cinerearis Bremer et Grey is a dangerous pest which feeds on leaves ofSophora japonica and Sophora japonica rar.'Pendula', which are important garden plants． It notonly effects landscape value but also excretes a lot of excreta． And it reproduces many generationsa year． In order to control the pest，predication it’s per occurrence period of larva is the key mea-sure． By raise study，oviposition stage was calculated and calculation showed that C(ovipositionstage）＝10.39±0.84（℃），K＝ 67.57± 3．03（DD）C（larva period）＝ 9．16± 0．42（℃)， K=241．26±5.21（DD）．The results are according with practical situation．