Soybean aphid infestations are increasing in the Upper Midwest, particularly in northern Iowa, necessitating regular scouting every seven to ten days through August, according to Syngenta agronomic services rep Jesse Grote. Grote recommends applying insecticides like Endigo ZCX when aphid numbers reach 250 per plant to effectively control the pest. The University of Minnesota Extension also reports significant increases in soybean aphid numbers in southern Minnesota.