Abstract
Field studies were conducted in 2009 and 2010 at the Huron Research Station, Exeter, Ontario and the University of Guelph Ridgetown Campus, Ridgetown, Ontario to determine the tolerance of four cultivars of cranberry bean (“Etna”, “Hooter”, “SVM Taylor”, and “Capri”) and four cultivars of kidney bean (“Red Hawk”, “Pink Panther”, “Calmont”, and “Majesty”) to linuron applied preemergence at 1125 and 2250 g·ai·ha-1. One week after emergence (WAE), linuron applied PRE caused 0.4% to 1.2% injury in “Etna”, “Hooter”, “SVM Tayler”, and “Capri” cranberry bean and 3.1% to 3.6% injury in “Red Hawk”, “Pink Panther”, “Calmont”, and “Majesty” kidney bean. At 2 and 4 WAE, there was no difference in injury among the dry bean cultivars. Contrast comparing injury due to linuron in cranberry vs kidney bean cultivars indicated 2.3%, 1.7%, and 1.2% greater injury in kidney bean compared to cranberry bean at 1, 2, and 4 WAE, respectively. Linuron PRE caused slightly greater injury in kidney bean compared to cranberry bean but crop injury was minimal with no adverse effect on plant height, shoot dry weight, seed moisture content, and yield under the environments evaluated. Based on this research, linuron applied PRE at the proposed rate of 1125 g·ai·ha-1 can be safely used in cranberry and kidney beans in Ontario.
Highlights
Canada, a major producer of dry bean, produces nearly 10% of the world’s dry bean valued at $226 million dollars annually [1]
Dry bean seed yield has been reduced as much as 70% due to weed interference [8]
Environment by Cultivar by Rate interaction was significant for injury 1 week after emergence (WAE): Exeter 2009 and Ridgetown 2010 were all zero and were separated from Exeter 2010 and Ridgetown 2009
Summary
A major producer of dry bean, produces nearly 10% of the world’s dry bean valued at $226 million dollars annually [1]. One the leading provinces in Canada in dry bean production, produces 129,000 MT of dry bean with a farm-gate value of approximately $90 million [2]. Major market classes of dry bean grown in Ontario include black, cranberry, kidney, and white (navy) bean. Dry bean is a short season crop with short physical stature and is very sensitive to weed interference [3,4,5,6,7]. Dry bean seed yield has been reduced as much as 70% due to weed interference [8]. Presence of weeds at the harvest time can cause seed staining and interfere with harvesting efficiency in dry bean [912]
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