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When do spray for the cotteling moths, Apple worms?
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This is a common question and an answer is already in the USU FAQs. Click on the following link http://utahpests.usu.edu/insects/htm/faq/faq_q=253
As for timing, the monitoring traps are around the different counties, and each county has different degree days and temperatures when codling moth emerges.
Go to the Tree Fruit IPM Advisory at http://utahpests.usu.edu/ipm/htm/advisories/treefruit. According to the most recent advisory dated April 28, 2009 - no codling moth has been found yet in Salt Lake County.
The Tree Fruit advisories recommend based on traps when to spray. You can subscribe via email to get this information http://utahpests.usu.edu/ipm/htm/subscriptions.
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