Weed Science (1998) 46, 301-306

Orvin C. Burnside, Melvin J. Wiens, Bobby J. Holder, Sanford Weisberg, Eric A. Ristau, Michelle M. Johnson and James H. Cameron (1998)
Critical periods for weed control in dry beans (Phaseolus vulgaris)
Weed Science 46 (3), 301-306
Abstract: 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 lambsquarters. 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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
damage/losses/economics
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Amaranthus retroflexus (weed)	Beans (Phaseolus)
	Chenopodium album (weed)	Beans (Phaseolus)
	Polygonum convolvulus (weed)	Beans (Phaseolus)
	Sinapis arvensis (weed)	Beans (Phaseolus)
	Solanum sarrachoides (weed)	Beans (Phaseolus)
	Ambrosia artemisiifolia (weed)	Beans (Phaseolus)