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Saturday, Oct. 10, 2015

Parasite slows True Armyworm invasion

Thursday, May 10, 2012

Pictured here is a parasitized true armyworm on a grass stalk.
Natural parasites are beginning to have an impact on true armyworm populations, according to University of Missouri Extension agronomy specialist Sarah Kenyon.

"This is good news for individuals who have been battling this pest," Kenyon said in a prepared statement May 7.

Armyworms that have been affected will be dark in color and will be mummified on the plant stalk. The worm will typically be positioned with its head pointed downward and juice may drip from the insect's mouth.

Parasite populations increase with moisture. The recent heavy dew, fog and rain should continue to provide favorable environments for the natural enemies.

However, Kenyon said, scouting should continue to verify the presence or absence of the parasites. Some areas may not be affected.

Also, true armyworm moths could migrate in and re-infest an area. Wayne Bailey, MU entomology specialist, estimates moths have the potential to migrate in for several more weeks.

Continue monitoring pastures and crop fields for true armyworm and other insects.

For more information, or with questions, contact your local Extension office. Kenyon can be reached at the Oregon County Courthouse in Alton at 417-778-7490 or oregonco@missouri.edu.

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