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Optimizing Insecticide Performance and Application Methods for Blueberries

Optimizing Insecticide Performance and Application Methods for Blueberries. John Wise PhD, and Annemiek Schilder, Carlos Garcia-Salazar, Rufus Isaacs Departments of Entomology and Plant Pathology.

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Optimizing Insecticide Performance and Application Methods for Blueberries

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  1. Optimizing Insecticide Performance and Application Methods for Blueberries John Wise PhD, and Annemiek Schilder, Carlos Garcia-Salazar, Rufus Isaacs Departments of Entomology and Plant Pathology

  2. Application Technologies in Blueberries:Application technology used by commercial growers vary, and are used with different settings and water volume depending on the time of season. • Aerial Application • Cannon Sprayers • Tower Sprayers • Airblast Sprayers • Proptec Sprayers

  3. Factors Affecting Performance Application Technology Pest Habitat and Behavior Optimal Pest Control Chemical Characteristics Weather and Crop Conditions

  4. Optimization of Pesticide Performance “To attain optimal pesticide performance the compound must be placed in contact with the pest, in the context of time and space, so as to attain effective activity on the target organism.”

  5. What is Adequate Coverage? Quality of spray deposition can be measured by the following: • % Surface Area Covered • Concentration of pesticide deposits • Spatial distribution of deposits in the canopy and across rows. Other factors: • Requirements of a given pesticide’s mode of activity • Pest Behavior and Biology

  6. Pest habitat and behavior

  7. Spray Deposition Study Objectives: • Characterize spray deposition on blueberries • 3 Sprayers: Agtec 400PC Cannon -Rotating Crop Head • Agtec 400PC VMC • Airblast Montana Suprema 1584 • 2 GPA’s (20 versus 40) • aerial application at 10 GPA • Determine the impact of spray deposition on pesticide performance. • Insect pests • Disease pests

  8. Vertical and Horizontal Distribution of Deposits Across 5 Rows How do application technologies differ?

  9. Measurement of Deposition • % Surface Area Covered: • Spray with kaolin (Surround WP) • How well is the spray solution distributed across the surface of the target? • 4.25 X 5.5 in. black cards • Concentration of Pesticide Deposited: • Blueberry clusters from all rows were sonicated in methyl alcohol to retrieve dislodgeable residues. • Absorbents determined for through spectrophotometric analysis. • Calculate concentrations from absorbance values and surface area percentages.

  10. 0.1% 1% 5% 10% 25% 50% 80% 100% Spray Deposition Ranges(% Surface Area Coverage)

  11. Sprayer Deposition Summary

  12. Materials and MethodsJapanese Beetle Field-based Bioassay • Imidan application using same sprayers and application rates. • Fruit clusters collected for assay chambers. • 5 beetles added to each chamber. • Mortality measured after 72 hours.

  13. Japanese BeetleField-based Bioassay

  14. % Japanese Beetles Dead after 24 h Imidan Control ResultsAerialSpray Deposition High - 17% coverage

  15. Tussock Moth Field-based Bioassay

  16. Cranberry Fruitworm Field Evaluation

  17. Phomopsis Field Evaluation

  18. Sprayer Performance Summary

  19. Conclusions for Sprayer Study • All sprayers provide sufficient deposition for good pest control. • In general, higher GPA of water diluent results in better coverage. • Airblast sprayer generally provides better coverage of lower canopy, but also overdoses closest rows. • Canon sprayer generally provides most spatially uniform coverage, but only sprays on one side. • VMC sprayer generally provides better coverage of higher canopy, compared to low-inside of bushes.

  20. Michigan Blueberry Growers Association Acknowledgements Collaborators / Technical Assistance Funding / Support Superb Horticulture Sam Irwin, Alan Stemen, Bert Hoeckelberg, Jan Lemler Thomas Bros. Equipment Ed Thomas, Adam Root Robertson Aerial Applicators John Robertson, Dan Robertson Pertics Blueberry Plantation Pickin’ Patch Evan Lengkeek, Dan Hulbert, Eric Hoffmann, Patrick Gaulier

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