Lep Monitoring Update WBC, CEW, FAW and ECB Updates

Western Bean Cutworm
We are in our third week of monitoring for Western bean cutworm (WBC) and numbers have remained low in all monitoring counties (Figure 1). Eighteen counties reported WBC moth catches, with all counties below an average of 4 moths per county. Scouting for WBC egg masses should begin when county averages are above 7 moths per week.

Western Bean Cutworm Moth Map
July 4 – 10, 2022

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Figure 1. Average western bean cutworm (WBC) moths captured from July 4th through July 10th. The large number indicates the average moth count for the week and the small number in parentheses is the total traps set up in the county.

Corn Earworm
Corn earworm (CEW) (Figure 2) numbers have continued to decrease over the past week. Van Wert county continues to report the highest average of 8.5 (Figure 3). Counties with high numbers of CEW and silking corn are at the most risk for CEW, because adult moths are attracted to silking corn.  For more information on corn earworm: https://agcrops.osu.edu/newsletter/corn-newsletter/2019-27/corn-earworm-field-corn-watch-molds

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Figure 2. Corn earworm (CEW) adult moth. Photo by: Bridger Cline, The Ohio State University

Corn Earworm Moth Map
July 4 – 10, 2022

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Figure 3. Average corn earworm (CEW) moths captured from July 4th through July 10th. The large number indicates the average moth count for the week and the small number in parentheses is the total traps set up in the county.

European Corn Borer
Two counties reported European corn borer (ECB) adult moths including Fulton and Clark (Figure 4).

European Corn Borer Moth Map
July 4 - 10, 2022

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Figure 4. Average European corn borer (ECB) moths captured from July 4th to July 10th. The first number indicates the average ECB-IA followed by a comma and then the average ECB-NY moth count for the week. The small number in parentheses is the total traps for each species set in each county.

Fall Armyworm
Fall armyworm (FAW) moths are currently being monitored in four counties in Ohio: Clark, Madison, Van Wert and Wayne. Currently both Clark and Madison counties reported FAW catches (Figure 5). In addition to FAW moths, there have been several reports of by-catch in the bucket traps. This moth differs from FAW adults and is known as the Phragmites Wainscot and has a dark bar in in the scales of the forewing (Figure 6A & B). Monitoring for FAW in additional counties will begin in August.

Fall Armyworm moth map
July 4 – 10, 2022

Figure 5. Average fall armyworm (FAW) moths captured from July 4th through July 10th. The large number indicates the average moth count for the week and the small number in parentheses is the total traps set up in the county.

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Figure 6. (A) Fall armyworm (FAW) adult moth. Photo by: Lyle Buss, University of Florida, Bugwood.org. (B) By-catch, Phragmites Wainscot (Leucania phragmitidicola) being found in FAW bucket traps. Photo by Jessi Raubenolt, The Ohio State University.

Crop Observation and Recommendation Network

C.O.R.N. Newsletter is a summary of crop observations, related information, and appropriate recommendations for Ohio crop producers and industry. C.O.R.N. Newsletter is produced by the Ohio State University Extension Agronomy Team, state specialists at The Ohio State University and the Ohio Agricultural Research and Development Center (OARDC). C.O.R.N. Newsletter questions are directed to Extension and OARDC state specialists and associates at Ohio State.