Control of common weeds in Wisconsin soybean cropping systems with pre‐emergence herbicides

The integration of pre-emergence (PRE) herbicides is an important component sustainable long-term weed management programs in soybean [Glycine max (L.) Merr.]. objective this study was to evaluate the efficacy 11 PRE on residual control soybean. Field experiments were conducted 2018 and 2019 at Arlington Lancaster, WI. Herbicide treatments consisted imazethapyr, chlorimuron-ethyl, cloransulam-methyl (acetolactate synthase [ALS] inhibitors), metribuzin (photosystem II [PSII] inhibitor), sulfentrazone, flumioxazin, saflufenacil (protoporphyrinogen oxidase [PPO] acetochlor, S-metolachlor, dimethenamid-P, pyroxasulfone (very long-chain fatty acid [VLCFA] a nontreated control. Predominant species included common lambsquarters, [Chenopodium album (L.)], purslane [Portulaca oleracea ragweed [Ambrosia artemisiifolia giant foxtail (Setaria faberi Herrm.), waterhemp [Amaranthus tuberculatus (Moq.) J.D. Sauer], yellow [Setaria pumila (Poir.) Roem. & Schult.]. Visual assessed by biomass across 65 days after treatment (DAT). herbicide varied site-years due different present each site. ALS inhibitors controlled lambsquarters ≥95% DAT Lancaster but <50% 2019. PPO >90% VLCFA purslane, species, ≥70% ≤30% Results showcase importance knowing composition seedbank within field; can assist growers crop advisers with selection appropriate effective herbicide(s) that matches individual field.