Weed Control and Bermudagrass [Cynodon dactylon (L.) Pers.] Response to Nicosulfuron Plus Metsulfuron Combinations

Mark A. Matocha, W. James Grichar

Abstract


Research was conducted from 2007 to 2010 to evaluate nicosulfuron plus metsulfuron combinations for weed control and crop injury to Tifton 85 and Jiggs bermudagrass. Sequential applications of nicosulfuron plus metsulfuron controlled Carolina horsenettle at least 73% with the exception of nicosulfuron at 32.9 g ai/ha plus metsulfuron at 5.3 g ai/ha sequential applications, which controlled Carolina horsenettle 67%. Single applications of nicosulfuron provided 68% or less control. In one study, field sandbur control was 75 to 81% with single applications of nicosulfuron plus metsulfuron while sequential applications of nicosulfuron plus metsulfuron at the higher rates controlled sandbur at least 90%. In another study, field sandbur control was at least 94% when nicosulfuron plus metsulfuron was applied sequentially at 39.4 g ai/ha plus 10.5 g ai/ha, respectively. Johnsongrass control was 88% with nicosulfuron plus metsulfuron at 59.1 plus 13.2 g ai/ha. Although both Tifton 85 and Jiggs were stunted with nicosulfuron plus metsulfuron, stunting was greater on Jiggs. However, only Tifton 85 yield was reduced with nicosulfuron plus metsulfuron combinations.


Keywords


bermudagrass; nicosulfuron; metsulfuron; weed control

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