Just a quick note to put out. Iowa State University has put out a black cutworm alert for Iowa. Based on peak cutworm moth flights earlier this spring, cutting dates can be established. The flights lasted over an extended period of time this spring during mid April and the end of April. Because of this the cutting period may last longer and you will need to keep a vigilant watch on your corn fileds. The thresholds are lower now because of the market price of corn. 2% damage from cutworms smaller and 3/4 of an inch will justify spraying. This year has been a tremendous start and I would hate to see cutworms put a dent into the top end.
What you should look for are plants that are wilting, damaged, or missing. Dig around those plants and see if you can find the cutworm. Dingy cutworms can also be found, so it is improtant to know the difference. Dingys usually don't present any concerns. It is the black that can do a ton of damage. Fields that are poorly drained, weedy, reduced tilled, or are near natural vegetation should be the first scouted. Count 50 plants in five different locations and then do the math to calculate percent damage.
If you have any questions or concerns, give me a call and I can help. I will spread the word quickly if I find any damaged plants.
Perri
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