中华稻蝗低龄若虫取食习性和营养效应

The Feeding Habits of Nymph of Young Rice Grasshopper

中华稻蝗在第一、二龄期主要在产卵场所取食杂草，很少取食水稻。用游草、狗牙根、狗尾草和稻苗喂饲一、二龄若虫，其相对取食量和近似消化率是游草＞狗尾草＞狗牙根＞水稻，但是转化率以取食水稻最高。因此，中华稻蝗在一、二龄期，防治效果最好。

Most small rice grasshopper,Oxya chinensis(Thunbery),in first and second instar chiefly ate the grasses at place of oviposition,and ate little rice.The pest in first and second instar ate the grasses of three species and rice and.The consumption index(CI) and approximate digestibility (AD)were decreasing progressively in Leersia hecandra>setaria viridrs>Cynodon dactylon> rice.The efficiency of conversion digested to rice was the highest.So,the best time of controlling of the pest was in the stage of first and second instar.