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Warm Water Treatments against Codling Moth Larvae in Cherries

Warm Water Treatments against Codling Moth Larvae in Cherries. Efficacy Trials. Review. Summer 2001. Recent. Summer 2002. Problem:. How to standardize the different types of water baths to allow for comparisons. Lethal Times. Based on heating block exposures Equivalent times

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Warm Water Treatments against Codling Moth Larvae in Cherries

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  1. Warm Water Treatments against Codling Moth Larvae in Cherries

  2. Efficacy Trials

  3. Review Summer 2001

  4. Recent Summer 2002

  5. Problem: How to standardize the different types of water baths to allow for comparisons.

  6. Lethal Times • Based on heating block exposures • Equivalent times • Standardized to 48°C

  7. Variables used for calculations • Bath temperatures • Fruit temperatures at time t • Accumulative measurements

  8. Calculating Lethal Times t LT = 10 -(T(t)-Tref)/z 0 where Tref= bath temperature and z = 4

  9. Standardize treatment temperatures to 48°C by: Corr. LT= LT/10(Tref-48°)

  10. Lethal Times: Comparisons across studies

  11. Lethal Times based on the equivalenttime on Heating Block set at 48°C.

  12. Summer 2002 All

  13. Treatment Equivalents • 48°C, 20 min • 50°C, 5 min • 52°C, 2 min • 54°C, 1 min

  14. Future needs: Standardizing treatment parameters

  15. Treatment Parameters • Load • Total amount • Amount per unit • Fluid capacity • Conductivity

  16. Treatment Parameterscont. • Starting temperature • Target temperature • Holding time • In original container • In separate baths

  17. Problems • Uniformity--how much variability is acceptable • Duplication (replication) • Fruit circulation (design) • Parts for improvement • Lost larvae

  18. How Quarantine Treatments Are Accepted by MAFF-Japan

  19. Minimum Requirements* • Least susceptible stage • Demonstration with 30,000 • Phytotoxicity tests • Safety and residue issues • One cultivar • More tests for other cultivars * Based on MeBr treatments

  20. Area MAFF Japan APHIS Researcher NPS Industry

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