Division of larval instars of Streltzoviella insularis
In order to determine the instar number of Streltzoviella insularis larvae under natural conditions,the larvae of S.insularis were collected in field at regular intervals,and the six indexes including head capsule width,body length,body width,pronotum width,mandible length and mandible width were measured,the regression equations of the six indexes were established by using the variance coefficient,Brooks index,Grosby index and frequency distribution graph.The results showed that S.insularis larvae had 13 instars and the head capsule width was the best index to determine the instar number of S.insularis larvae,the stadia of the larvae were determined.These results can provide a theoretical reference for the study of the occurrence regularity of S.insularis and the accurate formulation of prevention and control programs.
国家科技期刊平台
NSTL
万方数据
维普
