椰心叶甲取食行为及取食为害量研究

观察了椰心叶甲Brontispa longissima(Gestro)的取食行为、为害状以及幼虫对几种棕榈植物的取食量．结果表明,1、2龄幼虫取食量少,取食斑细,为害较少引起病斑;3、4、5龄幼虫取食痕较宽,被取食叶片形成的病斑大,易腐烂．成虫取食线虽然较细,但深而密,引起病斑较大,危害严重．幼虫期总取食叶面积为40～48cm^2．幼虫龄期越大,取食量越大．如1、2、3、4、5龄幼虫对椰子的取食量分别为1．7、3．7、6．9、12．6、22．8cm^2．在此基础上建立了对几种寄主植物的取食面积与椰心叶甲幼虫龄期之间关系的模型．

Feeding behavior of Brontispa longissima

Brontispa longissima (Gestro) was a newly dangerous invasive pest in China. The feeding behavior of B. longissima was observed and leaf area of Cocos nucifera, Roystonea regia, Chrysalidocarpus lutescens and Caryota ochlandra consumed by the pest larvae was measured in the laboratory. The feeding trace of the early larvae was slender and the damage was light. The feeding trace of late larvae such as 3,4,5 instars was wide and the damage caused was serious. For the feeding trace of the adults was slender and deep, the damage caused was also serious. The consumed leaf area by the larvae varied from 40 to 48 cm~2. The leaves of C. nucifera, R. regia consumed by the early larvae were more than those of C. lutescens and C. ochlandra, but leaf area consumed by the late larvae was not significantly different among the four host plants. The models were constructed between the leaf area consumed and the larva instars.