Abstract
Efficacy of Sequential Herbicide Applications in Glufosinate- and Glyphosate-Resistant Corn
Highlights
With the recent increase in glyphosate-resistant weeds, management practices that minimize resistance development have become even more important
Preemergence herbicides alone provided no more than 78% johnsongrass control early in the season. Only those plots receiving Roundup PowerMax had more than 85% johnsongrass control
Corn yields did not differ among treatments, and all herbicides increased yield 70–97% relative to nontreated corn
Summary
With the recent increase in glyphosate-resistant weeds, management practices that minimize resistance development have become even more important. Use of premixtures (multiple modes of action), tank mixtures, and non-glyphosate herbicides are increasingly needed to manage changing weed spectrums. The use of a strong residual herbicide program as well as control of escaped weeds is important. The objective of this study was to compare two preemergence programs and sequential glufosinate (Interline) or glyphosate (Roundup PowerMax) applications for efficacy in corn
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