WILD OATS, GREEN FOXTAIL, AND BROAD-LEAVED WEEDS: CONTROL AND EFFECT ON CORN YIELD AT BRANDON, MANITOBA

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Abstract
Twelve weed control treatments recommended for corn (Zea mays L.) in the dryland areas of Western Canada were compared over a 3-yr period from 1975 to 1977. Corn yields were similar after treatment with atrazine (2-chloro-4-ethylamino-6-(isopropylamino)-s-triazine) alone, plus cultivation, or plus butylate (S-ethyl di-diisobutylthiocarbamate), or EPTC (S-ethyl dipropylthiocarbamate) plus R25788 (N,N-diallyl-2,2-dichloroacetamide). Wild oats (Avena fatua L.) were consistently controlled by atrazine or by EPTC plus R25788 applied and incorporated before seeding. Postemergence applications of atrazine plus oil also effectively controlled wild oats. Butylate was not as effective as atrazine or EPTC plus R25788 in the control of wild oats. EPTC plus R25788 and butylate consistently controlled green foxtail (Setaria viridis (L.) Beauv.) while atrazine effectively controlled green foxtail only in 1976 when rainfall was above normal during the period of green foxtail emergence and initial growth. Broad-leaved weeds were controlled by atrazine with all methods of application. The preplant incorporation of atrazine plus butylate and the postemergence application of atrazine plus oil in a band over the row followed by interrow cultivation consistently controlled all weeds. Wild oats and broad-leaved weeds greatly reduced corn yields whereas green foxtail did not compete strongly with corn. Green foxtail was present only in the unweeded and atrazine treatments and, in those treatments, its ability to compete with corn may have been reduced by either wild oats or atrazine, respectively.
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