Pitted, ivyleaf and entireleaf morningglories are the three most troublesome morningglory species in Southeast Missouri cotton. In 1989, soil applied and post directed herbicide studies were established to evaluate the control of these three morningglories in cotton.

Morningglory Screening. In the soil applied herbicide screening study, Treflan (1.5 pt/A) or Prowl (1.5 pt/A) applied pre-plant incorporated (ppi) and a Zorial split treatment, 0.9 lb/A ppi + 0.9 lb/A preemergence (pre), provided <30% control of pitted morningglory. Zorial (1.88 lb/A) ppi, Caparol (2.4 qt/A) pre and all treatments including Cotoran (1.5 qt/A) pre provided 65%, 81% and >94% control of pitted morningglory, respectively. Control of ivyleaf and entireleaf norningglories was <35% with Treflan (1.5 pt/A) ppi, Prowl (1.5 pt/A) ppi, Zorial (1.9 lb/A) ppi and the Zorial split, 0.9 lb/A ppi + 0.9 lb/A pre. Ivyleaf and entireleaf morningglories were controlled 49% by Caparol (2.4 qt/A) pre and 84% by all treatments including Cotoran (1.5 qt/A) pre.