Codling moth is on the move! In the graph below, we have degree day models for 4 different sites across Ohio (Piketon, Columbus, Wooster, and Ashtabula). As expected, the southern sites (Piketon, Columbus) show higher Codling moth activity compared to our more northern sites (Wooster, Ashtabula). Make sure to time first or second cover sprays in line with egg-laying hatch. Generally, the first cover spray can be applied when eggs are at 3-5% hatch and then a second application around 10-14 days later.
Degree day model of Codling moth activity across 4 sites in OH. Data was taken from NEWA.
Depending on the insecticide product you want to apply, you can use the following table to determine when applications are needed based on the development of Codling moth in your area. For example, if you are looking to target Codling moth populations with insect growth regulator like Rimon, make sure you make your first application between 50–75 degree days. However, if you are planning to use Exirel wait until 150-250 degree-days. As you consider your insecticide program for the second generation of Codling moth, make sure you rotate your chemistries or IRAC codes. Please note that there are other products to control Codling moth, and this is not an exhaustive list of insecticides that can control Codling moth. Consult your Midwest fruit pest management guide for more options and information.
Please note that this DOES NOT include all options to control codling moth in apple.
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