三紋螟蛾(Hedylepta indicata)之生物特性及其天敵

Abstract

民國69至70年間三紋螟蛾(Hedylepta indicate (Fabr.))在臺中萬豐本所大豆田普遍發生，且以春、秋兩作較多，夏作則少。在25℃、70% RH之室內飼育環境下該蟲完成1代約需24天。雌蛾一生之產卵量平均爲311粒（165-466粒）。卵之孵化率約96.5%，幼蟲至成蟲之存活率約54.7%。在室內用盆栽豆株供螟蛾產卵，並將4,792粒卵移置田間以誘引天敵前來寄生。又將室內飼育之初齡幼蟲816隻移置田間豆株上，結果發現，其卵之孵化率約24.6%、幼蟲至成蟲之存活率爲0。此現象之發生似與該蛾之寄生性及捕食性天敵有關。The soybean leaf roller, Hedylepta indicata (Fabr.) (Lepidoptera: Pyralidae), was found to be very common in soybean fields in Wanfeng, Taichung. Its populations were more abundant in Spring and Fall crops than in Summer crop. Its developmental period from egg to abult was about 24 days. The duration of the egg, larval, and pupal stages averaged 4, 14, and 6 days, respectively. The duration of the 1st to 5th larval instars averaged 3, 2, 2, 2, and 5 days, respectively. Pupation took place inside rolled soybean leaves. Adults fed with 10% honey water were able to live for about 8 days in average under laboratory conditions. Mating took place a day after adult emeragence. Oviposition always occurred within a day after mating and continued throughout the life-span of a female. The total number of eggs laid was between 165-466 with an average of 311. The sex ratio was 1.3♀: 1♂.