By Robert Koch, Extension Entomologist
& Bruce Potter, IPM Specialist
Soybean aphids are small (1/16 inch or less), soft bodied insects that use piercing-sucking mouthparts to remove plant sap. Both winged and wingless forms can occur in the field. Their bodies are yellowish-green, pear-shaped and have a pair of dark cornices (“tailpipes”) at the end of the abdomen. Winged aphids have a dark colored head and thorax. During soybean pod fill, a small, pale-colored aphid form (referred to as “white dwarves”) may occur on leaves in the lower and middle canopy.
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