沈阳地区国槐尺蠖发生规律研究

The study on occurrence regularity of Semiothisa cinerearia in Shenyang

通过室内饲养和田间观察,对国槐尺蠖Semiothisa cinerearia Bremer et Grey各虫态(成虫、卵、幼虫、蛹)特征进行了详细的描述。对国槐尺蠖的行为习性、生活史以及田间种群消长规律进行了深入的研究。研究结果表明,国槐尺蠖在沈阳一年发生3代,无世代重叠,以蛹在树下松软土壤中越冬。国槐尺蠖幼虫共有7龄,1～4龄取食量小,5龄以后食量大增,进入暴食期,取食量占全幼虫期的80%～90%,而且随着虫龄的增长,其存活率增加。国槐尺蠖幼虫发生期为5月到9月,6月上旬、中旬至7月下旬为幼虫为害盛期,9月以后种群呈递减趋势,老熟幼虫开始入土化蛹越冬。

The characteristics of each stage of Semiothisa cinerearia Bremer et Grey（adult,egg,larvae and pupae）,and its behavior and habits,life history and population fluctuations,are described from laboratory and field observations in Shenyang.The results show that S.cinerearia has three non-overlapping generations a year and lives through the winter as pupae.The larvae undergo 7 instars.Instars 1-4 consume relatively little food but appetite increased markedly from the 5th instar after which larvae became extremely voracious with ingested food comprising 80%-90% of their body mass.Viability increased with each instar.The period of larval occurrence was from May to September and the most severe crop damage occurred in early and middle June and late July.Population size decreased after September when mature larvae begin to pupate and overwinter in soil.