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Time to Scout for Black Cutworm Damage

Posted: May 31, 2017

Last week I covered four important pest species that can cause trouble this time of year. They were black cutworm, cereal leaf beetle, slugs, and armyworm. This week little has changed and I encourage growers to continue to scout for these pest species to determine if they are infesting your fields and if their populations are economically relevant.

All the information that I shared last week remains relevant, but I can update the growing degree days accumulation to predict black cutworm cutting damage. Over the past couple weeks our Black Cutworm Monitoring Network detected five (not four) “significant flights” of black cutworm moths in five locations: near Fayetteville and Shippensburg (Franklin County), near Montoursville (Lycoming County), near Manheim (Lancaster County), and North Cornwall (Lebanon County). As of this morning, degree-day accumulations have exceeded 300 degree days for Fayetteville, Shippensburg and Manheim, and are at 260 and 290 for Cornwall and Montoursville, respectively. I recommend that growers across PA scout their corn fields now for cutting damage. Remember that well-timed scouting and spot rescue treatments are usually the most economical strategy for managing black cutworm. For more details on black cutworm, its biology, and management options see our Black cutworm factsheet.

Last week's Black cutworm, Cereal leaf beetle, Slugs, and Armyworm article.