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Evaluation of the fit of Tolpyralate for Weed Management in Field Corn (Zea mays L.) in Ontario

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Title: Evaluation of the fit of Tolpyralate for Weed Management in Field Corn (Zea mays L.) in Ontario
Author: Langdon, Nicole M.
Program: Plant Agriculture
Advisor: Sikkema, Peter H.
Abstract: Thirty-six experiments were conducted over two years (2018, 2019) to evaluate tolpyralate, a benzoylpyrazole 4-hydroxyphenyl-pyruvate dioxygenase inhibitor, for weed management in corn in Ontario. The importance of adjuvants (MSO and UAN) with tolpyralate + atrazine and the influence of Roundup Weathermax® was determined for control of nine annual weed species, glyphosate-resistant (GR) Canada fleabane and GR waterhemp. Optimal control was achieved with tolpyralate + atrazine + MSO and when tolpyralate + atrazine was co-applied with Roundup Weathermax®. Tolpyralate and tolpyralate + atrazine has residual activity on GR Canada fleabane, comparable to current industry standards. Three weed species exhibited a time-of-day effect to tolpyralate + atrazine, although, consistent control was achieved regardless of application time. Corn injury was greatest from tolpyralate + atrazine when applied at the 2X rate alone and/or co-applied with glyphosate at 1 WAA; there was no further increase in corn injury when co-applied with glyphosate.
URI: http://hdl.handle.net/10214/17882
Date: 2020-04
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