Activity of Avermectin B1 Against Codling Moth (Lepidoptera: Olethreutidae)1

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Abstract
Avermectin B1 was tested against codling moth, Cydia pomonella (L.), eggs and larvae in the laboratory and field. Complete mortality occurred in neonate and 10-day-old larvae when concentrations <0.05 and 0.32 ppm, respectively, were incorporated into larval diet. Concentrations of 0.025 in the diet allowed survival to the adult stage, but egg production from individuals treated both as neonate and 10-day-old larvae was markedly reduced. Topical applications to 7-day-old larvae were toxic at concentrations <5 ppm, but topical applications to eggs were toxic only at concentrations < 100 ppm. When immature ‘Golden Delicious’ apples were treated with 10 ppm and infested with neonate larvae, successful penetration was reduced and mortality increased over those on untreated fruit. Results of field tests suggest that low treatment levels of averpectin B1 may be useful against codling moth in the orchard ecosystem, even in areas with high populations.