Volume 31, Issue 2
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Precocene II is a botanically derived chemical that inhibits the production of juvenile hormone (JH) in insects. The effects of this anti-JH compound on molting and growth by and and reproduction in were tested and the efficacy of precocene II as a fumigant was assessed. Precocene II induced precocious metamorphosis in both species when applied by either contact exposure or fumigation, and this effect could be prevented by juvenile hormone replacement therapy. The dosage effective in inducing precocious metamorphosis in was similar to the EC previously reported for . The morphology of precocious adultoid of different instars was similar to adultoids of corresponding instars. However, was more sensitive than to the molt-inhibiting effects of precocene II. nymphs were fully susceptible to the anti-JH action of precocene when exposed for 24 hours one week before feeding. Precocene II was highly toxic to adult female and treatment of newly emerged females prevented oogenesis.


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