Codling Moth: Degree Day and Treatment Timing Predictions (June 27 Update)

Friday, June 27, 2025

The codling moth biofix dates for this season are June 10 for early regions and June 14 for late regions determined by Erika Bent, APM. 


Suzanne Blatt, AAFC, has run Jeff Franklin's calculations for the degree day model today according to the current forecast to predict when degree day thresholds will be met for treatments. The models were run yesterday with a degree day threshold of 10 degrees (C) using Kentville weather station data.


Codling Moth Treatment with Rimon
Timing: The treatment timing for Rimon is 80 degree days Celsius from biofix to target eggs before they hatch.

Prediction: Degree day thresholds met.

Codling Moth Treatment with Egg Hatch Products
Products:
 Assail, Delegate, Intrepid, Altacor, and Exirel

Timing: The treatment timing for egg hatch products is 100 degree days Celsius from biofix.
Prediction: Degree day thresholds met.

Codling Moth Treatment with Organophosphate
Product:
 Imidan
Caution: All hand thinning activities must be completed prior to application. No hand thinning can occur on trees treated with Imidan.
Timing: Control of codling moth with Imidan is typically slightly later at 140 degree days after biofix.
Prediction: Prediction: The 140 degree day threshold is forecast to occur in early regions today on Friday, June 27 and in late regions on Monday, June 30.

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