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Strategic Pest Management Tactics for Blackheaded Fireworm: Optimizing Reduced-Risk Insecticides

This study addresses critical pest management strategies for blackheaded fireworm control in cranberries, particularly in light of the imminent ban on organophosphates in Washington State. We evaluate various new reduced-risk insecticides, analyzing their efficacy and optimal application timing. Given the asynchronous hatching of fireworm larvae, we develop a refined integrated pest management (IPM) program that incorporates advanced trapping strategies and modeling for improved timing. This approach aims to enhance pest control while ensuring environmental safety through the use of sustainable chemistries.

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Strategic Pest Management Tactics for Blackheaded Fireworm: Optimizing Reduced-Risk Insecticides

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  1. Strategic pest management tactics for blackheaded fireworm using reduced risked ovicide/larvicide insecticides Kim Patten & Chase Metzger

  2. Background: • In 2015 the Washington Department of Agriculture will most likely ban the use of OPs on 56% of cranberry beds in WA, due to water quality issues. • Alternative reduced risk chemistries for fireworm control have been getting adopted by the industry, but control hasn’t always been satisfactory. • There are a lot of new reduced risk insecticides that we are only beginning to figure out how to best use. • Most applications are chemigated on systems with poor uniformity (DU< 70%) which compromise efficacy • Our insect pests have a very asynchronous hatch (3+ weeks) which make insecticide timing more challenging

  3. Project objectives: • Assess an array of new insecticide for efficacy against fireworm • Assess duration of field efficacy • Optimize timing intervals • Develop more refined IPM program for fireworm management

  4. Insecticide efficacy

  5. 1st generation BHFW efficacy trials a b a b b Applied 5/11 assessed 5/13 and 5/20

  6. 2nd generation BHFW efficacy trials Applied 7/21 assessed 7/25 & 7/29 larvae size equally distributed between 1 and 5 instar

  7. Duration of field efficacy

  8. Duration of field efficacy – fireworm 2nd generationTreatments were applied weekly (5/27 to 6/26)Which applications failed to provide control? Treatment window Sweep for efficacy

  9. Treat sweep Duration of field efficacy – fireworm 2nd generation5 different timings (5/27 to 6/26) – how long do they provide control? Spray dates a 33 days of control w/ Altacor 19 days of control w/ Intrepid ab 1 16 1

  10. Container of cranberries treated with Altacor or Intrepid before or after exposure to fireworm adults and assessed for damaged DBE - days before exposure DAE – days after exposure 10 DBE 5 DBE 1 DBE 1 DAE 5 DAE 10 DAE 5 days exposure

  11. 5 day ex-posure a b b b b b b b Data – highly variable Intrepid applied pre-egg laying – minimal control Altacor applied pre or post-egg laying - control

  12. Optimize timing intervals replicated trials

  13. Traditional insecticide timing

  14. Timing window Timing window With new reduced risk insecticides – what is the ideal timing and frequency? Do you get any ovicidal activity? Do you get any adulticidal activity? How long is the duration of field activity?

  15. Pre-hatch application of insecticide for control of 1st generation BHFW Treatments applied May 30, 2013 –at early rough neck ~ 1/4” growth; no larvae present Treat sweep a a b b b b Early timing for 1st generation provides superlative control, even under high pressure (17 days of control)

  16. Treat sweep a a a ab ab a a b Treatments applied 6/11/12 at first significant moth flight

  17. treat sweep Treat sweep

  18. Treat sweep a a ab b b b a b Treatments applied 6/29/12 just prior to egg hatch

  19. Develop more refined IPM program for fireworm management • Refinement of trapping • Use of trap data with GDD models • Consideration of additional insect pest • Resistance management

  20. Z traps

  21. IPM timing strategies for control 20 dd 110 dd 145 dd from biofix A or I A or I

  22. Comparison of Apples to Cranberries in the PNW • 2ndgeneration Codling moth larvae • Altacor: ~120 to 150 dd base 10˚C from biofix • Intrepid: ~130 to 150 dd base 10˚C from biofix • 2nd generation larvae Fireworm larvae • Altacor: ~110 to 150 dd base 10˚C from biofix • Intrepid: ~130 to 140 dd base 10˚C from biofix

  23. How do you overlay an Insecticide to target multiple insects May June July August Sept.

  24. Resistance managementGroup 18 – IntrepidGroup 5- DelegateGroup 22- AvauntGroup 28- Altacor, Cyazypr

  25. Summary • Good field duration (Altacor>Intrepid≥Cyazypyr>Delegate) • A fail-proof IPM for fireworm is feasible

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