2018 U of MN Cooperative Black Cutworm Trapping Network Report #3

Week of April 28-May 4, 2018

This newsletter is available in a print-friendly pdf format: 2018 Black Cutworm Network Report #3

Black cutworm moth captures throughout S. MN April 28-May 4Figure 1. Maximum black cutworm moth captures by county. April 27-May 4, 2018.

The past week brought rain and black cutworm (BCW) moths to many trap locations, both unwelcome. This is as large and widespread early-season influx of moths as we have seen for several years. 

Many counties have more than one trap operating. The reported maximum 2-night moth capture for all traps in a county during the week are shown in Figure 1.

Table 1 shows counties that reported significant (numbers indicating potential risk for economic damage to row crops) captures and dates.

Cottonwood, Faribault and Lac Qui Parle Counties had less than the 8 moths/2-night threshold but they caught 7, 6 and 6 respectively. Unfortunately, one of the Fillmore county traps could not be checked from April 30-May 4. It had 9 moths over that time.

There appears to be several migration events that we can use for a bio-fix (event to use as a starting point) for cutworm development. The first was the nights of April 29-30 but other systems look like they brought moths May 1 – 4th.  If you had thunderstorms pass through your area the past week, there is a chance it brought black cutworms with.

There appears to be several migration events that we can use for a bio-fix (event to use as a starting point) for cutworm development. The first was the nights of April 29-30 but other systems look like they brought moths May 1 – 4th.  If you had thunderstorms pass through your area the past week, there is a chance it brought black cutworms with.

signficant moth capture location and dates tableTable 1.  Significant moth capture locations and dates.

Previous black cutworm reports can be found at https://swroc.cfans.umn.edu/agricultural-programs/pest-management/black-cutworm-reporting-network .

Thanks to all of the cooperators who are maintaining traps and Minnesota Corn Research and Promotion Council for support.  This year, the cooperative trapping network running will be helpful in identifying black cutworm risk locations and timing.

Until next week,  

Bruce Potter and Travis Vollmer