Are there any good/safe sprays that can be used to reduce the population in the fall and winter?
Clackamas County Oregon
Here in the Northeast, no. Your best bet is to practice sanitation, removing apples (fallen and/or if left on the trees), bins/boxes/woodpiles in and around the orchard where codling moth overwinters. I think that is it. Good luck...Jon
Codling moth overwinters in the Willamette Valley as a full grown larvae in bark, under leaf litter, and in wood piles and orchard bins. Sanitation is your best bet this time of year. Please see this publication on managing codling moth.
Here are some sanitation practices, from the PNW handbook on codling moth, to use next season: https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth.
In small orchards, sanitation by removing and disposing of young damaged fruit can be helpful in reducing codling moth. Check regularly throughout the season for fruit with frass-filled holes. Removing and destroying infected fruit prior to larvae emergence preceeding pupation can help reduce overall populations. Picking up dropped fruit from the ground likewise can be an effective sanitation measure. Homeowners can bag individual fruit (clusters thinned to one fruit) in paper bags approximately six weeks after bloom, however this can be labor-intensive and more challenging for cultivars with short stems. Fruit will mature completely within bags, however color development on red varieties may be affected. Homeowners can also place corrugated bands of cardboard around the lower trunk to attract larvae looking for a place to pupate. Place in May and remove before the adults begin to emerge in mid-June. The same technique can be used with the subsequent generation(s) later in summer.