Corn earworm in sweet corn trapping map – July 22-28, 2013

First generation corn earworm activity is increasing in southern Michigan.

See the map below for corn earworm activity in pheromone traps for July 22-28, 2013.

Corn earworm trapping map
Numbers on map represent the number of corn earworms caught in pheromone traps between July 22-28, 2013. Each number is the total number of moths caught in a week, in a single trap placed near a sweet corn field.

To learn more about corn earworm biology, trapping and management, read the Michigan State University Extension article “Corn earworm activity is beginning in Michigan sweet corn fields” from 2012. The only recent change to this article is that any number of corn earworms caught in the pheromone trap signals the beginning of the spray program, if the field has fresh silk. Please check MSU Extension bulletin E-312 for more information on insecticides registered in sweet corn. Remember, that if the silks have turned brown in the field where your corn earworm trap is, it means that its time to move the trap close to a field that has fresh silk.

Dr. Szendrei’s work is funded in part by MSU‘s AgBioResearch.

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