Traps indicate early-season black cutworm arrival in Indiana

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Source: Purdue University

Black cutworm pheromone trap cooperators throughout the state have detected the insects' arrival in Indiana from southern Texas and northern Mexico where they overwinter, said a Purdue Extension field crop entomologist.

The moths travel to the Midwest on warm, moist air currents from the Gulf Coast.

"The direction that these weather systems move and the number of moths that are carried within them will determine if they are brought into our area and whether or not they will pose a threat to our crops," Christian Krupke said.

Black cutworm moths are attracted to green vegetation for egg laying, so infestations of larvae usually appear first in weedy areas of fields. Newly hatched larvae feed on weeds or young corn plants and leave small, irregular holes in leaves. While most early feeding poses little threat to the young plants, Krupke said it is an indication of the potential for severe damage by later, larger cutworms.

"Larger larvae may notch the stems of seedlings immediately below the soil surface, which can cause plants to wilt and die," he said. "They may completely cut through stalks, which can result in severe stand reductions."

Mid- to late-April marks the critical time for moth activity, so Krupke, trap coordinators and other Purdue Extension entomologists will be watching for a period they refer to as "intense capture."

"Intense capture is when nine or more moths are caught in a trap over two days," Krupke said. "Early indications are that we are entering that period right now — probably due to the storm systems that have moved through the area recently, which can carry large numbers of female moths with them. The large numbers of unplanted fields with winter annual weeds will provide lots of potential egg-laying sites for those females."

Once corn is planted, farmers will want to scout their fields and decide how to manage any black cutworm infestations.

This pest can damage all cornfields, but fields with pre-plant weeds are at the highest risk and should be sampled, Krupke said. Other high-risk fields include those that are late-spring plowed or late planted, where corn follows beans or in fields with minimum tillage.

"When scouting, walk throughout fields shortly after plant emergence, checking plants for signs of black cutworm feeding, such as leaf damage, wilted plants or cut stalks," he said. "If black cutworm damage is observed, sample the field immediately to make an accurate assessment of the threat posed by the larvae."

More information about black cutworm can be found on the Purdue Extension Field Crops Integrated Pest Management Web site and in the April edition of the Purdue Pest and Crop Newsletter.

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