Many plants possess juvenile hormone principles (Bowers, 1971; Jacobson et al., 1975, Rajendran and Gopalan, 1978), moulting hormones (Slama et al., 1974) and antiallatu tropic compounds (Bowers, 1976) af-fecting the development of insects. All these substances are of importance in that they are likely to become third and fourth generation pesticides (Willi-ams, 1967; Bowers 1976). Many species of plants were screened for Juvenile hormone mimicking com-pounds and the results of the investi-gations are reported in this paper.
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