Development and Control of Honeyvine Milkweed

Abstract

Seeds of honeyvine milkweed [Ampelamus albidus(Nutt.) Britt.] planted immediately after extraction from mature seed pods germinated 84% and after burial overwinter germinated 97%. Seedling emergence was limited to depths of less than 4 inches. Seedling roots developed adventitious buds capable of producing new shoots about 5 weeks after emergence. Preemergence and early postemergence treatments with 2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine (atrazine) gave 100% control of seedlings in greenhouse experiments. Heavy natural infestations of honeyvine milkweed in corn (Zea maysL.) were controlled 95% with 2,4-(dichlorophenoxy)acetic acid (2,4-D) at 0.5 lb/A when treatments were made before the weed started climbing on corn stalks. Later treatments required higher rates of 2,4-D, the use of 2,4,5-(trichlorophenoxy)acetic acid (2,4,5-T), or the combination of 2,4-D plus 2,4,5-T for adequate control.