title: [Effect of difluron (dimilin) on larvae, imagines and eggs of Epilachna varivestis Muls. through application to the host plant].
abstract: Dimilin active ingredient diflubenzuron) is an insecticide influencing the chitin synthesis. The paper investigates its effect under application via the host plant. After oral intake with the food, the larvae of Epilachna varivestis Muls. (Mexican bean beetle) could not carry out the next molting and died. Imagines which had taken up Dimilin laid fewer eggs than untreated beetles, and no larvae hatched from the eggs. Direct treatment of the cluster of eggs with Dimilin also affected their development, depending on the degree of concentration. Freshly laid eggs were more susceptible than older ones. Contact with the treated non-host plant Vicia faba also caused disturbances in the development. The sensitive phase in the second instar lies between 24 and 48 hours after the previous molt. 3 to 6 hours exposition time are sufficient to inhibit the molting of the larvae, 9 hours suppressed the molting completely. The concentration limit for larvae of Epilachna varivestis lies between 1.0 and 2.5 ppm.
mesh_terms: D000818:Animals; D002686:Chitin / Q000096:biosynthesis; D001517:Coleoptera / Q000378:metabolism; D004132:Diflubenzuron / Q000008:administration & dosage / Q000494:pharmacology*; D005260:Female; D007300:Insect Control / Q000379:methods*; D007306:Insecticides / Q000008:administration & dosage / Q000494:pharmacology*; D007605:Juvenile Hormones / Q000494:pharmacology*; D007814:Larva; D008297:Male; D010063:Ovum; D010935:Plant Diseases; D010944:Plants / Q000469:parasitology*
chemical_list: D007306:Insecticides; D007605:Juvenile Hormones; D002686:Chitin; D004132:Diflubenzuron
vernacular_title: Uber die Wirkung von Diflubenzuron (Dimilin) auf Larven, Imagines und Eier von Epilachna varivestis Muls. bei Applikation über die Wirtspflanze.