昆虫的幼虫在正常生长情况下,每脱一次皮,身体即有一定的增长,如头壳每脱一次皮,头壳宽度即增加1.4倍,此为一般所称的戴氏律。而幼虫的体长,一般亦因每脱一次皮而呈规律性的增长,只是种类不同,其递增的增长率不一。应用通式进行幼虫体长与龄期之间的测算,对于指导预测预防和适时防治,具有重要意义。1 昆虫幼虫期平均增长率的推算 Insect larvae in normal growth conditions, each off the skin, the body that is a certain increase, such as the skin off the first time the shell, the shell width that is increased 1.4 times, which is commonly referred to as Dai law. The larvae body length, generally also because of each off the skin showed a regular growth, but different types, their increasing growth rates vary. The application of general formula for larval body length and age between the estimates for the guidance of prevention and timely prevention and control, is of great significance. 1 insect larval period average growth rate of the projections