Activity of Insect Growth Regulators, Hydroprene and Methoprene, on Wheat and Corn Against Several Stored-Grain Insects1

Two insect growth regulators (IGR), hydroprene and methoprene, when applied to wheat and corn kernels at concentrations ranging from 2 to 10 ppm, prevented the metamorphosis of the Indian meal moth, Plodia interpunctella (Hübner), and effectively reduced the F1 populations of the lesser grain borer, Rhyzopertha dominica (F.), the confused flour beetle, Tribolium confusum Jacquelin duVal, and the sawtoothed grain beetle, Oryzaephilus surinamensis (L.). However, they were not as effective against the rice weevil, Sitophilus oryzae (L.), since substantial numbers of progeny developed in wheat kernels treated at a rate of 10 ppm with either of the compounds.