Evaluation of weed control and injury to peanut cultivars with paraquat in various herbicide combinations in irrigated vs non-irrigated conditions


University of Georgia

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Southeast (GA, FL, AL)

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The state of Georgia produces nearly half of the peanuts (Arachis hypogaea L.) in the United States. In 2016, approximately half of the state's production was non-irrigated. In the Southeast, weed control programs for peanut include paraquat (Gramoxone) as a postemergent (POST) herbicide. Paraquat is tank-mixed with other herbicides to broaden the weed control spectrum. While the use of paraquat is common, the introduction of new peanut cultivars calls for more information on their tolerance when paraquat is applied alone and in tank-mixtures. Even with nearly half of the state growing peanut in rainfed conditions, there is little information available on the effects irrigation has on peanut injury from paraquat. Paraquat is known to cause injury to peanut foliage, however cultivars have been able to overcome the foliar damage without loss of yield or grade. The use of safeners in tank-mixtures has been shown to reduce phytotoxicity. This research project is designed to highlight paraquat's efficiency in weed control and provide insight into herbicidal injury in irrigated and non-irrigated situations for current high-yield potential cultivars that have not been previously tested for their tolerance to paraquat. 

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