First discovered in the United States more than 200 years ago, codling moths (Cydia pomonella L.) can be found in every state where apples are grown. The wormy terror is an apple grower’s arch nemesis as the most devastating pest to pome fruit crops. If left unchecked, codling moths can cause 80 to 100 percent damage in an orchard.
“Codling moth larvae can wreak havoc in apple and pear orchards every year,” said John Aigner, UPL Technical Services Lead. “So it’s important to scout for them and take action if they’re found. Adults are grey and white striped moths that deposit eggs on the underside of leaves. And newly emerged larvae immediately seek out the fruit.”
Though every part of the apple is susceptible to an attack from the larvae, Aigner recommends scouting on either end of the apple or where two apples touch. This sleuthing insect prefers to hide in areas that are not as easily spotted.
Scouting should be done multiple times a week early in the season and then on a weekly basis after that.
The good news is that the codling moth does have weaknesses. Yes, you heard that right. You can avoid devastation this season.
While scouting, regularly clear out discarded fruit, leaf litter and unnecessary foliage. Trees that are not maintained or used should be cleared as well. Cocoons can hide in unsanitized orchards.
Next, growers should turn to their local extension office for growing degree day models for the region. Growing degree days (GDD) are used to estimate the growth and development of the orchard and pests. Regular scouting can verify the GDD’s guidance.
“Once reaching an accumulated 160° days, placing preventative products will coincide with early egg hatch and will help get ahead of the first generation before any devastating damage occurs,” Aigner said. “One of the standard insecticides used by apple and pear growers for control of codling moth is ASSAIL® insecticide from UPL. An application of ASSAIL controls first-generation codling moths with the added benefit of secondary pest control as well.”
ASSAIL also offers secondary control of aphids, Campylomma, apple maggot, plum curculio and more. It’s superior formulation makes ASSAIL widely regarded as one of the most versatile products on the market today, and with proper application, the ingredients are easy on bees.
Prevent your arch nemesis from showing up in the orchard this season by contacting your UPL rep about ASSAIL insecticide.
