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Corn
Volume 65 Number 2 Date 05/07/2020 BLACK CUTWORM - A weekend weather system brought the first significant flight of black cutworms northward into the state. DATCP's 44 monitoring locations collected 198 moths, with three sites registering intense captures of nine or more moths in two nights. The highest trap count for the week was 20 moths near Dickeyville in Grant County. Pheromone traps have captured a cumulative total of 307 moths since April 8. Last season at this time, the count was 758 moths. The black cutworm counts recorded this spring are considered low in comparison to captures in high-moth years, while early spring field preparation and planting have reduced the amount of habitat attractive for egg laying female moths. Based on the May 4 first significant capture or biofix and the expected slow accumulation of degree days next week, the peak seedling corn damage window is not forecast to open until June 3 in the southern two tiers of Wisconsin counties. SEEDCORN MAGGOT - Emergence of first-generation flies from overwintered pupae has peaked across the southern and west-central areas of the state with the accumulation of 360 degree days (sine base 39F). Peak emergence is expected to occur next week from Appleton to Tomah and northward. Heavy egg laying is likely during this time, increasing the risk of maggot damage to susceptible crops such as corn and soybean seeds and seedlings. Planting as close as possible to the 'fly-free' period between the first and second generations can reduce risk and is the primary cultural control for this spring soil insect pest. -- Krista Hamilton, DATCP Entomologist 
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