甘薯天蛾饲养研究初报

Preliminary studies on rearing of Herse convolvuli linne

取食甘薯叶的幼虫重量(约为7.53g)比取食空心菜叶的幼虫(约7.77g)稍轻,但其死亡率较低;成虫产卵以顶叶下第4片叶上最多,占30.13%,第3、5叶次之,分别占27.78%和20.71%;甘薯天蛾幼虫头壳指数为0.6240,可作为分龄依据;幼虫饲养密度(x)与幼虫重量(y1)呈显著负相关,与死亡率(y2)呈显著正相关。

The weight (753 g) of larva feeding on sweet potato(Ipomoea batatas Lam.) was lighter than that (777 g ) on swamp cabbage(Lpomoea aquatia Forsk),but mortality rates were the contrary The larva head capsule index of Herse convolvuli was 06240 which could be regarded as a index recognizing larva instar There were most eggs(3013%) on the fouth leaf from top,and the eggs on the third (2778%) and fifth (2017%)leaf followedThere was significant negative correlation between larva density(x)and weight(y1),while significant positive correlation between larva density(x)and mortal rates(y2). 