EFFECTS OF DIFLUBENZURON ON LARVAL DEVELOPMENT OF ZAPRINONUS PARAVITTIGER (GODBLE AND VAIDYA) (DIPTERA: DROSOPHILIDAE)

Feeding of diflubenzuron to different-aged larvae of banana fruitfly, Zaprionus paravittiger (Godble and Vaidya), produced a differential susceptibility. The first-instar larvae were significantly more susceptible than the second- and third-instar larvae. The ID 50 (50% inhibitory dose) values for adult emergence were 0.16, 0.32 and 0.95 ppm for first-, second-, and third-instar larvae, respectively. The frequency of morphological abnormalities increased and F₁ adults failed to reproduce. Furthermore, the total body glycogen increased and total body proteins decreased after feeding diflubenzuron to second-instar larvae for 24 h.