Crop & Pest Report

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Too Hot for Soybean Aphids (7/5/12)

Soybean aphids continue to be stagnant or low (see IPM map) due to abundance of beneficial enemies in fields and hot weather (>90 F), which slow population growth to nil.

At 95F, no nymphs are produced and longevity (life span) is significantly reduced. Avoid the temptation to tank mixing an insecticide with the herbicide application(s), especially when soybean aphid populations are below the economic threshold level (average of 250 aphids per plant and on 80% of plants in field). This will disrupt and kill the beneficial insects causing the aphid populations to recover and to increase their populations faster. Herbicide applications typically provide poor insect control due to the low pressure and large droplet size.

Soybean Aphids

Janet J. Knodel

Extension Entomologist

janet.knodel@ndsu.edu

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