Inhibition of Larval Growth of the Queensland Fruit Fly, Dacus tryoni (Diptera: Tephritidae) in Apples

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Abstract
Examination of samples of naturally infested apples suggested that larval development of the Queensland fruit fly, Dacus tryoni Froggatt, was more inhibited in unpicked than in picked fruit. When fruit was artificially inoculated with eggs, no differences in egg mortality were found between picked and unpicked fruit. Larval mortality was significantly greater in unpicked than picked fruit when inoculations were made some weeks before fruit fall. Inhibition could not be demonstrated experimentally in early season apple varieties, which mature and fall over a much shorter period than late season varieties. The level of inhibition appeared to decline as the fruit matured.

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