Control of glyphosate-resistant Palmer amaranth in DHT cotton and peanut response to 2,4-D
Merchant, Rand Michael
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Cotton (Gossypium hirsutum) resistant to 2,4-D could potentially allow for more POST herbicide options for control of glyphosate-resistant Palmer amaranth (Amaranthus palmeri). Trials were conducted to determine the most effective herbicide systems for control of Palmer amaranth using DHT technology. For most effective control (99%) growers should use a system that includes a PRE herbicide at planting followed by a POST application of 2,4-D plus glufosinate with a sequential POST application made 12 days later and a layby application prior to canopy closure. In an effort to mitigate the risk of 2,4-D drift, growers can make applications at 7:00 AM when wind speeds are lower. This is imperative since susceptible peanut (Arachis hypogaea) is often planted near cotton and can suffer yield losses if injured by drift rates of 2,4-D, particularly 60 days after planting.