Abstract
Ontario dry bean growers are currently limited to ALS inhibitor herbicides for soilapplied broadleaf weed control; therefore another mode of action is needed. Sulfentrazone is a PPO inhibitor herbicide that has activity on some annual grass and broadleaf weed species. Four field trials were conducted over two years (2014, 2015) to determine the tolerance of four commonly grown dry bean market classes (adzuki, kidney, small red Mexican and white bean) to PRE applications of sulfentrazone at 140, 210, 280 and 420 g·ai·ha-1. Crop injury, plant height, plant density, shoot biomass, seed moisture content and yield were examined. Sulfentrazone (420 g·ai·ha-1) caused up to 74%, 22%, 30%, and 57% injury in adzuki, kidney, small red Mexican and white bean, respectively. Plant density, height and yield were not reduced for kidney or small red Mexican bean. Sulfentrazone (420 g·ai·ha-1) reduced white bean plant density, height and yield by 28%, 29% and 29%, respectively; and reduced adzuki bean plant density, height and yield by 51%, 34% and 57%, respectively. Overall, kidney and small red Mexican bean were the most tolerant to sulfentrazone, followed by white bean, and then adzuki. This study determined sulfentrazone applied PRE is safe for Ontario kidney bean and small red Mexican bean crops.
Highlights
Dry beans (Phaseolus vulgaris L.) are an important crop for southwestern Ontario
Analyses revealed that sulfentrazone rate was significant for all assessments, and bean market class was significant for injury at 2, 3, 4, 6 and 8 weeks after crop emergence (WAE), plant density, height, shoot dry weight, seed moisture content and yield (Table 1)
Rate by market class interaction was significant for injury 3, 4, 6 and 8 WAE, plant density, height, and yield (Table 1)
Summary
In 2014, over 50,000 ha of white and coloured dry beans were seeded in Ontario, produc-. Two soil-applied broadleaf herbicides are registered for Ontario dry beansimazethapyr and halosulfuron. Both are group 2, ALS inhibitor herbicides. Sulfentrazone is a soil-applied, protoporphyrinogen oxidase IX (PPO) inhibitor herbicide that provides residual control of many broadleaf weeds and some grasses. As weeds emerge from the soil, the protoporphyrin IX reacts with light to produce O+, which peroxidizes cell membranes causing cellular leakage. It controls weed species such as Amaranthus retroflexus L. (crabgrass), Panicum spp. and Setaria faberii L.
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