SUSCEPTIBILITY OF STORED-PRODUCT INSECTS TO PYRIDYL ETHER ANALOGS OF JUVENILE-HORMONE

Four pyridyl ether analogues of juvenile hormones were each mixed separately with whole wheat or ground wheat medium and tested for activity against stored product insects. (E)-5{[5-(3-butyl-3-methyloxiranyl)-3-methyl-2-pentenyl]oxy}-2-ethylpyridine was effective at 2 and 0.1 ppm in preventing larval and adult development, respectively, from eggs of Tribolium confusum Jacquelin duVal. The ID95 doses of 0.04-50 ppm also suppressed the development of adult progeny of Plodia interpunctella (Hubner), Ephestia cautella (Walker), Sitotroga cerealella (Olivier), Rhyzopertha dominica (F.), Oryzaephilus surinamensis (L.), and Sitophilus oryzae (L.). Other compounds were less effective. Addition of a propyl substituent on the epoxide terminus of (E)-5-{[5-(3, 3-dimethyloxiranyl)-3-methyl-2-pentenyl]oxy}-2-ethylpyridine increased activity about tenfold. © 1979, American Chemical Society. All rights reserved.