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Green Cloverworms Feeding on Pods of Dry Beans (09/12/19)

Green cloverworm continues to feed on foliage and now the pods of dry beans, becoming a worse problem in dry beans than originally expected!

Green cloverworm continues to feed on foliage and now the pods of dry beans, becoming a worse problem in dry beans than originally expected! There has been no report of green cloverworm feeding on pods of soybean yet. Field reports have come in from the Red River Valley area of Fargo north to St. Thomas and east to Crookston and Park Rapids, Minnesota.

Here’s a reminder to continue to scout until the end of R6. Shake plants vigorously to dislodge green cloverworm larvae onto the soil to see if they are present and then estimate the defoliation on the WHOLE plant. The Economic Threshold (E.T.) for all foliage-feeding caterpillars is:

  • SOYBEANS - 20% defoliation from pod-set to maturity
  • DRY BEANS – 25-30% defoliation

If treatment is needed, please check the Pre-Harvest Intervals (PHI) of insecticides registered for caterpillars in dry beans, which can vary from 7 to 21 days. For insecticides registered for caterpillar control by field crops, please consult the 2019 North Dakota Field Crop Insect Management Guide E1143.

 

Janet J. Knodel

Extension Entomologist

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