Four field trials were conducted over a three-year period (2011–2013) in southwestern Ontario to evaluate the level of weed control provided by various halosulfuron tankmixes applied preplant incorporated (PPI) in white bean. Trifluralin, s-metolachlor, halosulfuron, and imazethapyr applied alone or in combination caused 4% or less visible injury 1 and 4 weeks after emergence (WAE) in white bean. Trifluralin, s-metolachlor, halosulfuron, and imazethapyr applied PPI provided 80–96%, 84–95%, 83–100%, and 75–92% control of redroot pigweed; 19–28%, 30–40%, 97–99%, and 73–84% control of common ragweed; 94–96%, 63–82%, 96–100%, and 96–100% control of common lambsquarters; 14-15%, 12–35%, 100%, and 96–97% control of wild mustard; and 96–97%, 95–97%, 53–56%, and 80–82% control of green foxtail, respectively. The two- and three-way tankmixes of halosulfuron with trifluralin, s-metolachlor, or imazethapyr provided 85–100% control of redroot pigweed, 90–98% control of common ragweed, 97–100% control of common lambsquarters, 100% control of wild mustard, and 93–98% control of green foxtail. Weed density, weed biomass and white bean seed yields reflected the level of visible weed control. 1. Introduction Ontario is one of the main regions for the production of white (navy) bean (Phaseolus vulgaris L.) in North America. In 2012, white bean growers in Ontario planted 28,000 hectares and produced 68,000 MT of white bean with a farm-gate value of approximately $38 million [1]. White bean has short physical stature and therefore is more vulnerable to weed interference and subsequent yield losses if weeds are not adequately controlled [2–6]. Yield losses of 59% have been attributed to weed interference in dry beans in Ontario which is substantially greater than other field crops such as winter wheat (3%), spring cereals (12%), soybean (38%), and corn (52%) [7]. There is only one registered soil applied broadleaf herbicide, imazethapyr, for weed control in white bean in Ontario. Imazethapyr provides only marginal control of common lambsquarters (Chenopodium album L.) and common ragweed (Ambrosia artemesiifolia L.) and has a narrow margin of crop safety in dry bean [2, 6]. More research is needed to identify new herbicide options for annual broadleaf weed management in white bean. Halosulfuron is a newly registered sulfonylurea herbicide that controls redroot pigweed (Amaranthus retroflexus L.), common lambsquarters, common ragweed, wild mustard (Sinapis arvensis L.), nutsedge species (Cyperus spp.), ladysthumb (Polygonum persicaria L.), velvetleaf (Abutilon theophrasti
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