Abstract
Publisher Summary The involvement of hormones in Kalotermes flavicollis on the formation of castes is well established. The outcome of a moult depends on the titre of juvenile hormone (JH) present in the hemolymph. A high titre of JH leads to a moult producing a presoldier; in contrast, the moult to an imago requires a substantial fall in this titre. Other types of moults arise from intermediate titres. Implantation of corpora allata (CA) experiments, and also the application of synthetic JH and of chemical substances having similar effects provide convincing proof. The role of the moulting hormone, ecdysone, in the regulation of caste development remains obscure. The reproductive functions of both male and female require a high titre of JH. Factors involved in the stimulation of the CA of the reproductives remain hypothetical. The chapter also highlights that hormones play primordial roles in caste determination and reproduction of termites.
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