LABORATORY EVALUATION OF 5 NEW JHA DERIVATIVES FROM 2-(4-HYDROXYBENZYL)-1-CYCLOHEXANONE AGAINST TRIBOLIUM-CASTANEUM (HERBST)

The insecticidal activity of five new juvenile hormone analogues, deri vatives from 2-(4-hydroxybenzyl)-1-cyclohexanone, has been evaluated a gainst Tribolium castaneum and compared with the commercially availabl e fenoxycarb (Insegar). Last instar larvae and less than 2-day-old pup ae were topically treated. Concentrations ranged from 0.016 to 411.5 m ug/g for larvae and from 0.0004 to 497.9 mug/g for pupae. The most eff ective compounds against larvae were fenoxycarb and compound I (LD50 = 0.143 and 0.187 mug/g, respectively). However, the new derivatives we re far more active than fenoxycarb on pupae, compound I being the most effective (LD50 = 0.011 mug/g).