Tolerance of field peas to graminicides and metribuzin combinations
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Tolerance of two cultivars of field peas (Pisum sativum L.) to sethoxydim, fenoxaprop-P-ethyl, clethodim, fluazifop-P-butyl and haloxyfop, and their combinations with metribuzin was investigated in 1987, 1988, and 1989. Both Trapper and Victoria peas exhibited satisfactory tolerance to metribuzin (0.21 kg a.i. ha-1 ) and the graminicides when tested alone. However, tank mixed treatments caused some crop injury which sometimes affected pod maturity and seed yield. Tank mixes significantly reduced Victoria yield by 7 % compared to graminicides alone. Trapper yield was not significantly reduced. The increased injury observed with metribuzin when tank mixed, was attributed to the use of adjuvants, required for enhancing graminicidal activity, which may have increased foliar uptake of metribuzin by peas. The adverse effect of metribuzin in tank mixes was more pronounced on both cultivars in 1988 when it was exceptionally hot and dry.
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