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；５）用取食道长度来估计龄期具有更实用的意义文章还研究了几种寄主作物取食道长度与龄期间的关系 The results showed that: 1) the pharyngeal pharyngeal length of larvae was the basis of their age; 2) the larvae had different length of feeding lanes at different temperatures, but There was no significant difference in esophageal area; 3) The larvae fed on different hosts had different degrees of esophageal length and area; 4) The 3rd instar larvae were the main larvae affected by larvae, Of the area more than 82%; 5) It is more practical to estimate the age by the length of the esophagus. The article also studied the relationship between the esophageal length and the age of several host crops.