Oviposition by sterile codling moths, Cydia pomonella (Lepidoptera: Tortricidae) and control of wild populations with combined releases of sterile moths and egg parasitoids

Stephanie Bloem, K. A. Bloem, A. L. Knight


This paper provides data on the number of nonviable Cydia pomonella (L.) eggs that are present in orchards receiving sterile moths and the potential for these eggs to support populations of the parasitoid Trichogramma platneri Nagarkatti. In the laboratory, non-irradiated female codling moths laid ca. 214 eggs in their lifetime while females irradiated with 330 Gy laid only 93 eggs. Persistence data collected in the field indicated that the majority of nonviable eggs were no longer suitable for parasitization after 1 week. With a release rate of 1,000 sterile females per hectare per week we estimated that 30,000-40,000 nonviable eggs per hectare would be present in orchards at any given time. When a combination of sterile moths and parasitoids were released into large field-cages fruit damage was less than seen when either tactic was used alone.

Key words: Cydia pomonella; sterile insect release; oviposition; biological control; parasitoid

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