What's the codling moth hatch date for Dexter?
I'm trying to figure when to apply Neem oil to control codling moth.
Lane County Oregon
I don't know the exact date for Dexter, but each spring codling moths begin to emerge around the time apple trees bloom, which in the Eugene/Springfield area is typically around the first week of May. By about late May, female codling moths lay eggs that soon hatch into the larvae that cause the damage associated with this pest. The larvae tunnel into the core of the fruit where it then feeds. Later on the larvae exit the fruit, pupate, then emerge as adults to complete a second life cycle. In warm years, a third life cycle may occur as well.
Pheromone traps can be useful for detecting the presence of adult moths, but they are ineffective as a control measure. Generally some type of spray is necessary to prevent damage from codling moths (for a list of chemicals approved for home use, see: https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth). Target the 1st spray for the 1st generation about 15 to 21 days after full petal fall (all petals are off) followed by 2nd spray in about 3 weeks. A 3rd spray for the 2nd generation can be made in early July followed by another in about 3 weeks. Depending on both the selected product and the weather, more than one application may be necessary to prevent codling moth damage. When using any pesticide, always follow all label instructions carefully.
For more information on managing coddling moth and other pests of apples and pears, you can view online or download a free copy of the OSU Extension Publication 'Managing Diseases and Insects in the Home Garden' (EC 631) here: https://catalog.extension.oregonstate.edu/ec631