We are particularly interested in the chemistry of insects which are plantation pests or vectors of tropical diseases. One of the most serious endemic diseases in Brazil is Chagals disease for which the bug Prlnstmngylus n1agi. s' Iu. v is the vector. It has been found 'that when P. ntegislzzs was treated with precoeene l. small anti-JH activity was observed. However, when precocene ll was applied to the third and fourth instars of P. Ill ('g!-i\.'lH.\'_ ...
