Jun 20, 2017
Moth numbers have increased since the week of June 12, specially in the Colusa trap. The degree day model predicted worms in the fifth instar by June 22; I'm starting to receive reports of worms in Colusa, Glenn and Butte counties. Keep your eyes on the field; heat speeds up development and worms may show up earlier.
If moth numbers continue to increase, we may have a longer period of worm infestation ahead of us.