weed control in soybeans. asclepias on the field with young soybeans. lambsquarters soy sprouts on an unencidesed

asclepias field young soybeans lambsquarters soy sprouts unencidesed herbicidefield weed cover present agricultural death crop control soybean single nonresidual time farmers should intensify management critical period without fields organic farms transmit diseases pests cause problems harvesting dealing troublesome weeds where herbicides from affected prevent herbicideresistant spreading grass