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Scout for Pea Aphids in Pulse Crops (06/23/16)

Low numbers of pea aphids, only 1 per sweep, are being found in field peas in Mountrail, Divide and Williams counties, and in lentils in Williams and McKenzie counties

Scout for Pea Aphids in Pulse Crops

Low numbers of pea aphids, only 1 per sweep, ent.11are being found in field peas in Mountrail, Divide and Williams counties, and in lentils in Williams and McKenzie counties (Source: NW Pulse Crop Survey, Adam Carlson & Dr. Kalil). Pea aphids are small, about 1/8+ inch long and pale to dark green with reddish eyes. 

Scouting for aphids in pulse crops is conducted using either a sweep net or examining the number of aphids per plant tip when 50 to 75 percent of the crop is flowering. Take 180 degree sweeps using a 15-inch sweep net or check at least five 8-inch plant tips from four different locations in the field.  Population estimates should be calculated by averaging counts taken from four separate areas of the field. Insecticides should be considered when the following economic thresholds are reached:

Field pea:  1-2 aphids per plant or 10 aphids per sweep.

Lentils:  30 to 40 aphids per sweep.

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Janet J. Knodel

Extension Entomologist


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