美洲斑潜蝇幼虫取食行为及龄期划分

THE LEAFMINING BEHAVIOURS AND INSTARS DISTINGUISH OF Liriomyza sativae (Diptera:Agromyzidae)

对美洲斑潜蝇幼虫取食行为和龄期划分开展了研究，结果表明：１）幼虫头咽骨长度是其分龄的依据；２）不同温度下，幼虫取食道长度有显著差异，但取食道面积没有显著差异；３）取食不同寄主的幼虫，其取食道长度和面积均有不同程度的差异；４）３龄幼虫是幼虫为害的主要虫龄，其取食面积占幼虫总取食面积的８２％以上；

The larvae of Liriomyza sativae Blanchard leafmining activity and its instar distinguishing were studied in this paper. The results indicated that, 1) larval instar could be distinguished from the length of cephalopharyngeal skeleton; 2) the mean mine lengths mined by the larvae showed significantly differences under various temperatures treated , no significant differences were observed on its mean mine area; 3) both mean mine length and mean mine area mined by the larvae were changable with their host plants; 4) the third instar larvae was the main one of larvae to damage, its mean mine area occupied over 82% of total larval infestation, and 5)using the mine length mined by the larvae could conveniently determine the instar sizes. The relationships between the mine length mined and instar sizes at various common host plants were described in the paper.