Critical periods for weed control in dry beans (Phaseolus vulgaris)

• Published in: Weed science Vol. 46; no. 3
• Main Authors: Burnside, O.C. (University of Minnesota, St. Paul, MN.), Wiens, M.J, Holder, B.J, Weisberg, S, Ristau, E.A, Johnson, M.M, Cameron, J.H
• Format: Journal Article
• Language: English
• Published: 01.05.1998
• Subjects: BIOMASA; BIOMASS; BIOMASSE; COMPETICION VEGETAL; COMPETITION VEGETALE; CONTENIDO DE MATERIA SECA; CROP YIELD; DATE; DATE DE PLANTATION; DESHERBAGE MECANIQUE; DRY MATTER CONTENT; ESCARDA MECANICA; FECHA DE PLANTACION; GRAINE; LOSSES; MALEZAS; MAUVAISE HERBE; MINNESOTA; PERDIDAS; PERTE; PESO DE LAS SEMILLAS; PHASEOLUS VULGARIS; PLANT COMPETITION; PLANTING DATE; POIDS DES SEMENCES; RENDEMENT; RENDEMENT DES CULTURES; RENDIMIENTO; RENDIMIENTO DE CULTIVOS; SEED OUTPUT; SEED WEIGHT; SEEDS; SEMILLA; TEMPS; TENEUR EN MATIERE SECHE; TIEMPO; TIME; WEEDING; WEEDS; YIELDS
• ISSN: 0043-1745; 1550-2759
• DOI: 10.1017/S0043174500089451

Weed removal experiments in dry edible beans were conducted during 1992 and 1993 at Crookston and Staples, MN. Ten manual weed removal treatments were studied to determine when a natural infestation of weeds first reduced dry bean yield, and when weed removal could be discontinued without further loss of seed yield. Major weeds in order of average biomass production on weedy check plots at dry bean harvest over locations and years were wild mustard, foxtail spp., redroot pigweed, common ragweed, wild buckwheat, hairy nightshade, and common lambs-quarters. Hairy nightshade also emerged late in the growing season and could negatively affect harvest efficiency and stain navy beans. Weed removal treatments had little effect on dry bean stands or 100-seed weights of harvested dry bean seed. The critical period for weed control in dry beans was 3 to 5 or 6 weeks after planting (WAP). Thus, weed control practices should begin no later than 3 WAP and continue until at least 5 or 6 WAP for maximum dry bean yields