The Role of Juvenile Hormone in the Density-Related Color Variation in Larvae of Cephonodes hylas L. (Lepidoptera : Sphingidae)

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Abstract
Topical application of juvenile hormone (JH) and a juvenoid (ZR 515) to the crowded larvae of C. hylas caused pale pigmentation of the solitary phase at the next instar. Thus, the role of JH in the phase control of Cephonodes larvae and Locusta hoppers appears to be similar or identical. JH I and JH II were 4-20 times more potent than JH III in their inhibition of dark pigmentation. ZR 515 was the most effective among the chemicals used.