Early-Season Crop Insects

May 11, 2010 at 5:36 pm

Below is from the May 10, 2010 issue of OSU Extension CORN Newsletter available at: http://corn.osu.edu/newsletters/2010/2010-12/spring-insects

As we are now into crop emergence and early plant growth, we are receiving reports from all the field crops that we concern ourselves with of various insects that are beginning to make their presence known. We would remind growers that it is the time to begin scouting early crop growth, and taking necessary action when warranted.

  • Although we have not received many reports of alfalfa weevil causing significant injury to alfalfa, we have had a few calls of treatable populations. We would remind growers that if the alfalfa is 16 inches in height or taller, they should consider an early cutting rather than making an insecticide application. When doing so, they should plan on checking the regrowth for possible weevil feeding.
  • We are getting reports of heavier than normal populations of cereal leaf beetle adults from wheat fields, especially from more northern locations. As we have mention previously, we do not know if this will lead to heavier populations of larvae. However, with flag leaves starting to emerge, growers should at least check once or twice to make sure larvae do not become a concern.
  • Although bean leaf beetles are not expected to be high, growers who have experienced problems from overwintered before or those concerned with bean pod mottle virus which is transmitted by the beetle should begin checking emerging soybeans.
  • We have received some reports of flea beetles on corn. Although not expected to be a problem based on average winter temperatures, we would as we always do, suggest that growers scout their early corn growth for unexpected large populations.
  • As mentioned last week in C.O.R.N., slug activity and feeding has begun.
  • As we get into late May and early June, no-till growers especially need to begin scouting for possible black cutworm feeding, which is of special concern on later planted corn that will be smaller when cutworms reach their greatest feeding potential.

For more information on these and other pests, grower should check our web site at http://entomology.osu.edu/ag/ for fact sheets which discuss the need for management and give thresholds where appropriate, and where you can obtain Bulletin 545 which gives recommended insecticides if treatment becomes necessary.

Early Insects Podcast

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