David Owens, Extension Entomologist, owensd@udel.edu
Alfalfa
Alfalfa Potato leafhopper populations are increasing. Most alfalfa should be ready to harvest at this point, but for fields that are not at bud or flowering, a good threshold table can be found on the UD alfalfa insect control guide: https://www.udel.edu/content/dam/udelImages/canr/pdfs/extension/sustainable-agriculture/pest-management/Insect_Control_in_Alfalfa_-2023.pdf.
Soybean
Japanese beetles are continuing to move into soybean, as are Dectes stem borer. We have a good fact sheet on Dectes here: https://www.udel.edu/academics/colleges/canr/cooperative-extension/fact-sheets/dectes-stem-borer/. Defoliation thresholds at this time are 25-40 percent on double crop to full season bean fields; I have not received any reports of fields going above this level.