寄主植物对椰心叶甲生长发育的影响

观察研究了椰心叶甲Brontispa longissima(Gestro)]取食椰子(Cocos nucifera)、大王椰子(Roystonea regia)、散尾葵(Chrysalidocarpus lutescens)的生长发育情况。结果表明取食不同棕榈科植物的椰心叶甲各龄幼虫发育历期有明显差异。幼虫历期以取食椰子的较长于其他2种寄主植物的,3种植物上的蛹历期均在6d左右,完成一代所需时间在椰子上约需63d,大王椰子和散尾葵上为55d左右。单头雌虫产卵量以椰子上较高,为150粒,大王椰子和散尾葵上较低,分别为119和114粒。幼虫取食不同寄主发育为成虫,雌雄比均接近2：1．在供试植物上椰心叶甲各虫态存活率均较高,在椰子、散尾葵、大王椰子上的实验种群趋势指数分别为85．2、50．6、36．5。

Effect of Host Plants on Development and Survival of Brontispa longissima (Gestro)

The development duration and survival of palm leaf beetle Brontispa longissima (Gestro)] were observed in laboratory, and its life table was constructed. The results showed that life spans of palm leaf beetle feeding on Cocos nucifera, Chrysalidocarpus lutescens, Roystonea regia were different significantly. The survival rates of palm leaf beetle feeding on C. nucifera, R. regia, C. lutescens were at a range of 88% to 97%. The influence of different host plant on the survival rate of different stages of palm leaf beetle was not significant. The adult longevity of palm leaf beetle feeding on C. nucifera was 192 days, and longer than those feeding on the other host plants significantly.The influence of host plants on fecundity of palm leaf beetle was significantly different. The fecundity of the female on C. lutescens was 149.52, more than those on other two plants. The pre-oviposition period on three species of plants was not significant.Indices of population trend of palm leaf beetle on Cocos nucifera, Chrysalidocarpus lutescens, Roystonea regia.were 85.2, 50.6 and 36.5 respectively