Two growth rate models,G=δ(I-C) and G=δ(lnI-C) have been utilized widely for modeling the development stage of insects and other animals.Based on the study of the individual development of Chrysopa phyllochroma larvae (feeding on Aphis gossypii Glover),we found that in many circumstances,these two growth rate models produced insignificant condition and offered parameters were lack of biological meaning.This paper indicated that:① under the special circumstances,when prey is sufficient,each insect ...