Lesser Cornstalk Borer
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The lesser cornstalk borer (Elasmopalpus lignosellus) is an uncommon pest of sweet corn that can feed on a number of crop plants, but economic problems are usually associated with hot, droughty conditions and late planting. Larvae are bluish green with yellowish white stripes on their backs. They form silken tubes at the base of the plant that incorporate bits of soil. The larvae wiggle violently when removed from the tubes. Lesser cornstalk borer can bore into the side of the crown and attack the growing point, resulting in a deadheart.
Lesser cornstalk borer on seedling.
(Photo: UK Vegetable IPM Team, University of Kentucky)
Management:
- Monitor young seedlings carefully during hot, dry conditions, especially with late-planted corn.
- Foliar sprays directed at the base of the plants will help reduce plant loss.
