Lep Monitoring Update: WBC Declines, Increased FAW Trapping Begins

Western Bean Cutworm

Western bean cutworm (WBC) numbers continue to decrease over the past week, with a total average of 0.86 moths across the state. This decline suggests we are past peak WBC season as no counties reported being above threshold (an average of 7 or more moths for the week) recommended for scouting (Figure 1). With this decrease, many counties will be replacing WBC monitoring with FAW as more counties set up FAW traps this week.

Western Bean Cutworm Map

August 1-7, 2022

Fig 1

Figure 1. Average western bean cutworm (WBC) moths captured from August 1st through August 7th. 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.

Fall Armyworm

Fall armyworm (FAW) (Figure 2) numbers increased slightly over the past week with, three counties reporting moth captures. These counties include Madison, Van Wert, and Wayne. Clark county was also monitoring for FAW but reported finding 0 moths (Figure 3). This increases the statewide average from 1.8 to 2.3. As WBC numbers continue to drop, additional counties will begin monitoring for FAW over the next couple of weeks.

Fig 2

Figure 2. Fall armyworm (FAW) adult moth. Photo by: Lyle Buss, University of Florida, Bugwood.org.

Fall Armyworm Moth Map

August 1-7, 2022

Fig 3

Figure 3. Average fall armyworm (FAW) moths captured from August 1st through August 7th. 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

The number of Corn Earworm (CEW) has slightly increased over the past week going from a statewide average of 1.4 to 2.8. While moths continue to be reported in five of the monitoring counties, the numbers remain low across the state (Figure 4). Muskingum Co. reported the highest moth count with an average of 18 moths over the past week.

Corn Earworm Moth Map

August 1-7, 2022

Fig 4

Figure 4. Average corn earworm (CEW) moths captured from August 1st through August 7th. 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

This week’s numbers for European Corn Borer (ECB) have decreased from last week but two reporting counties continue to report moths (Figure 5). The two counties that found ECB over the last week were Fulton and Muskingum counties. Overall, the average is very low statewide with 0.2 ECB-IA and 0 EBC-NY.

European Corn Borer Moth Map

August 1-7, 2022

Fig 5

Figure 5. Average European corn borer (ECB) moths captured from August 1st to August 7th. 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.

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.