1a. Objectives (from AD-416)
Objectives and Anticipated Impacts: The overall objective of this project is to develop advanced, biointensive apple IPM tactics and apply them in a system to reduce pesticide reliance and lower non-target pesticide impacts. Specific objectives address seven key areas. 1. Plum curculio - use a trap tree approach to replace general orchard sprays. 2. Apple maggot - use pesticide-treated sphere traps for management rather than general orchard sprays. 3. Obliquebanded leafrollers and internal Lepidoptera - use seasonal fruit monitoring programs for optimizing insecticide treatments. 4. Eliminate organophosphates and use pesticides with fewer non-target impacts. 5. Apple scab - use potential ascospore dose, inoculum destruction and degree-day model to delay initial fungicide applications in the following season and end applications when unnecessary. 6. Sooty blotch and flyspeck - develop model-directed applications of reduced-risk fungicides. 7. Eliminate carbaryl - for fruit thinning, develop approaches that do not use carbaryl as a thinning agent.
1b. Approach (from AD-416)
Use a trap tree approach to replace general orchard sprays in plum curculio. Use pesticide-treated sphere traps for management rather than general orchard sprays for apple maggot.
3. Progress Report
Apples are a high value crop in the Northeast, with over 100,000 acres and an annual farm-gate value of $389 million in 2006. The pest complex on apples in the Northeast is very large, but a relatively small group generates the most pesticide use. The most important insect problems are associated with insects whose larvae feed internally within fruit. This includes codling moth, oriental fruit moth, apple maggot, and plum curculio. The overall objective of this project is to develop advanced, biointensive apple IPM tactics and apply them in a system to reduce pesticide reliance and lower non-target pesticide impacts. Specific objectives addressed by USDA-ARS-AFRS include implementation of behaviorally-based, reduced risk management strategies for plum curculio and apple maggot. For plum curculio, management of plum curculio in the advanced IPM plot, we will evaluate the efficacy of the odor-baited trap tree strategy to control the immigrating population. For this trial, ~12 perimeter-row trees on a 5-acre experimental plot will be baited with a synergistic odor blend for plum curculio, consisting of four dispensers of benzaldehyde and a single dispenser of grandisoic acid. These trap trees will be deployed ~25 meters from the ends of perimeter rows and separated by ~50 meters within the perimeter row or row ends. At petal fall, each grower will apply a full-block insecticide treatment using materials selected from the list of program-certified products. After petal fall, plum curculio will be managed in the advanced IPM plots using a trap-tree management protocol. Only the odor-baited trap trees will be treated with insecticide following the full-block insecticide application at petal fall. The incidence of injury to fruit by PC in all plots will be assessed ~8 weeks after the petal fall spray. For apple maggot fly in the advanced IPM plot, we will assess the protective capability of odor-baited, toxicant-treated attracticidal spheres for direct control of apple maggot fly as a commercial substitute for summer insecticide sprays. In each of the advanced IPM plots, we will deploy a perimeter arrangement of odor-baited sphere traps to intercept and kill immigrating apple maggot flies. These test plots will receive no insecticide spray targeting apple maggot flies from mid-June through harvest. As with the plum curculio trap-tree assessments, the paired, grower-managed plots will receive insecticide treatments based on individual grower's determination of need, timing, material, and rate. Both advanced IPM plots and grower-managed plots will be equipped with unbaited monitoring spheres within the body of the plot to monitor fly population density. Capture rates of apple maggot flies on these monitoring traps will be recorded biweekly. At harvest, we will evaluate fruit for the presence of apple maggot fly injury in plots protected by odor-baited visual traps and by conventional insecticide treatments. The ADODR has monitored activities through emails, meetings, and calls.