Comparative Effectiveness of Fifteen Insect Growth Regulators Against Several Pests of Stored Products1

Concentrations of 5, 10, and 50 ppm of each of 15 insect growth regulators (IGR) were admixed with appropriate foods to which each of 12 species of stored-product insects were exposed. The IGR, compounds tested included the natural juvenile hormone of the tobacco horn worm, Manduca sexta (L.) (methyl 10, 11-epoxy-3,7-11-trimethyl-2,6-dodecadienoate), and 14 analogues of diverse chemical structure. The dienoates, AltozarTM (ethyl 3,7, 11-trimethyl-2,4-dodecadienoate) and AltosidTM (isopropyl 11-methoxy-3,7, 11-trimethyl-2, 4-dodecadienoate) were the most, active IGR compounds on all species tested. Neither affected parent adults. Both compounds acted on F1 progeny, and effectiveness, was measured by treatment effects in preventing success was generations. Altozar treatments were effective at 5 ppm against the almond moth, Cadra cautella (Walker); Indian meal moth, Plodia interpunctella (Hübner); red flour beetle, Tribolium castaneum (Herbst); Trogoderma inclusum LeConte; find T. variabile Ballion. It was effective at 10 ppm against the lesser grain borer, Rhyzopertha dorminica (F.), and at 50 against the granary weevil, Sitophilus granarius (L.). A high level of activity was demonstrated by Altozar at 10 ppm in tests with the confused flour beetle, Tribolium confusum Jacquelin du Val, and at 50 ppm in tests with the rice weevil, Sitophilus oryzae (L.), but it did not completely prevent emergence of F1 adults at these concentrations. Altosid was effective at 5 ppm against the Indian meal moth; cigarette beetle, Lasioderma serricorne (F.); lesser grain borer; saw toothed grain beetle, Oryzaephilus surinamensis (L.); merchant grain beetle, O. mercator (Fauvel); and the red flour beetle. It was effective at 10 ppm against the almond moth and confused flour beetle.