Soybean aphids (Aphis glycines Matsumara) are a piercing and sucking insect that have been affecting soybeans in the U.S. since the early 2000s. Aphids tend to be a problem in late-planted soybean fields during years with dry conditions and moderate temperatures. The insects themselves are small (1/16 in. long), pear-shaped, and yellow-to-green in color. They have black extensions on the body toward the back legs that are often called “tailpipes.” Winds deposit aphids in fields, so the infestation works from the top of the plant to the bottom. Aphids are most damaging in dry field conditions but shy away from heat, so look for them on the underside of leaves.
Categories: Agronomy, Agronomy Talk