Evaluating the Efficacy of the Systems Approach Components for Western Cherry Fruit Fly (Rhagoletis Indifferens)
Temperate Tree Fruit and Vegetable Research
2010 Annual Report
1a.Objectives (from AD-416)
Evaluate the components of the systems approach including the use of chemical controls, cold treatment and fruit inspection.
1b.Approach (from AD-416)
Provide preliminary or final data on: Western cherry fruit fly infestation patterns within orchards; Effects of pre- and post-harvest insecticide treatments on infestations; Chilling effects on different life stages of western cherry fruit fly; Efficacy of detection methods for western cherry fruit fly larvae. Documents SCA with WSU.
The project goal is to evaluate components of the systems approach for detection of cherry fruit fly larvae in cherries, including the use of infestation distribution data, chemical controls, and fruit inspection. Work was conducted in 2009 to determine if the brown sugar flotation method is better at detecting larvae in cherries than the hot water method, which involved crushing infested cherries, placing them in brown sugar solution or hot water, and then inspecting the brown sugar solution surface or bottom of pans with hot water for extracted larvae. Crushed cherries from both methods were preserved in alcohol. In 2009-2010, these cherries were carefully examined under a microscope for any larvae not extracted, in order to calculate a recovery or detection rate. In 2010, experiments were conducted using insecticides to determine if they can kill larvae inside cherries left on trees, specifically with respect to the ability of the insecticides to resist rain effects. Plans are being made to further evaluate methods of larval detection in cherries by modifying the methods evaluated in 2009 to see if efficacy can be increased, and to release flies into an experimental orchard to determine distributions of infestations. Monitoring of activities and progress on this project was accomplished by direct supervision of on-site employees, and use of site visits, email and telephone to communicate with off-site collaborators.