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Postemergence Weed Control in Pea (Pisum sativum) with Imazamox
Author: Robert E. Blackshaw, Agriculture and Agri-Food Canada, Lethbridge, Alberta,
Date Created: June 09, 1998
Last Reviewed: February 14, 2007
Source: Weed Technology: Vol. 12, No. 1, pp. 64–68. Summary · Few postemergence (POST) herbicides are available for broad-spectrum weed control in pea. · Field experiments were conducted to determine the suitability of imazamox (Trade name: Odyssey) to provide selective control of grass and broadleaf weeds in pea. · Imazamox controlled several grass and broadleaf species, but the rate required to attain 90% control ranged from 7 to 36 g ai/ha depending on the weed species. · Imazamox efficacy differed with the adjuvant included in the spray mixture. Merge adjuvant often increased imazamox activity on weeds more than Sun-It II methylated seed oil or a combination of Agral 90 adjuvant plus 28–0–0 liquid fertilizer. · Pea exhibited excellent tolerance to imazamox up to the highest rate applied, 40 g/ha. Pea yield comparable to that of the hand-weeded control was attained with 20 to 30 g/ha of imazamox. · Imazamox offers growers a POST option for broad-spectrum weed control in pea.