Relationships of foliar azinphosmethyl concentration, exposure time, and mortality for the apple maggot (Diptera: Tephritidae).
Stanley B.H. | Reissig W.H. | Shoemaker C.A. | Robson D.S.
A laboratory bioassay to study the effects of azinphosmethyl on adult apple maggot, Rhagoletis pomonella (Walsh), mortality and oviposition was developed by placing apple branches bearing field-weathered residues inside a wind tunnel. Repellency by azinphosmethyl that was observed in a previous study did not occur. Thirty-six percent of the females died after 24 h of exposure to 29- to 30-d-old residues, and the oviposition punctures per females were 66% lower than that in the untreated controls. This reduction in oviposition was greater than would have been expected from mortality alone and is probably caused by sublethal poisoning. These results imply that sufficient protection may be provided by older residues (greater than 14d) when apple maggot populations are low. Mortality was described by two mathematical models, which were corrected for the time that the flies spent on the nontoxic walls. The relationships developed in this study should contributed to the development of a "treat-when-needed" strategy for apple maggot control.
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