Evaluation of herbicide resistance in Rumex sp.
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Date
2019
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CCSHAU
Abstract
The present investigation entitled, “Evaluation of herbicide resistance in Rumex sp.” was carried out during rabi season of 2017-18 in the screen house of Department of Agronomy, Chaudhary Charan Singh Haryana Agricultural University, Hisar (Haryana). This pot experiment was conducted in a completely randomized design, replicated thrice. In order to evaluate the issue of herbicide resistance in this weed, herbicides recommended for the control of broad leaf weeds in wheat crop namely metsulfuron, Total, carfentrazone, Lanfida, Atlantis, isoproturon, 2,4-D amine and ester salt, Accord plus, diflufenican, aclonifen + diflufenican, halauxifen + fluroxypyr, aclonifen, halauxifen, pendimethalin, metribuzin were applied at three doses (0.5X, X and 2.0X ) in the experiment as pre-emergence or post-emergence intervention as per the nature of particular herbicide. One unsprayed control was also kept for each population and herbicides for comparison.
The results in general indicated that Rumex biotype have attained resistance against metsulfuron, Total, Atlantis and, isoproturon. The moderate efficacy and tolerance even at double the recommended doses was observed in carfentrazone, Lanfida, 2,4-D amine and ester salt, Accord plus, diflufenican, aclonifen + diflufenican aclonifen and halauxifen. Higher values of plant height, chlorophyll fluorescence, fresh weight and dry weight and lower value of EC was observed in the herbicidal treatments showing comparatively less efficacy against the weed. The post-emergence application of halauxifen + fluroxypyr provided good control of Rumex sp. even at half of recommended dose. The good efficacy of this herbicide combination provides opportunity to integrate this herbicide in weed managment options in wheat crop at field level. The pre-emergence application of pendimethalin and metribuzin gave complete control even at half of the recommended dose. The pre-emergence application of pendimethalin, pre and post-emergence application of metribuzin have already been recommended and promoted for the management of Phalaris minor in wheat crop. One single intervention may provide management of complex weed flora infesting the wheat crop. The information collected from this study will facilitate proactive management of herbicide resistant through sequential application of pre-emergence and post-emergence herbicides and also using the compatible herbicide mixtures in rotations to reduce the selection pressure and tackle the proliferation of resistant bio-types.
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