TY - JOUR ID - 154741 TI - Herbicides for control of metsulfuron resistant toothed dock (Rumex dentatus) JO - Journal of Research in Weed Science JA - JRWS LA - en SN - AU - Chhokar, Rajender Singh AU - Sharma, Ramesh Kumar AU - Chaudhary, Ankur AU - Singh, Gyanendra P. AD - ICAR-Indian Institute of Wheat and Barley Research, Karnal AD - ICAR-Indian Institute of Wheat and Barley Research, Karnal,, India AD - RRS CCS HAU Hisar, Uchani, Karnal, India AD - ICAR-Indian Institute of Wheat and Barley Research, Karnal, India Y1 - 2022 PY - 2022 VL - 5 IS - 2 SP - 87 EP - 104 KW - 2 KW - 4-D KW - ALS inhibitor KW - carfentrazone KW - cross-resistance KW - florasulam KW - flumioxazin KW - halauxifen KW - isoproturon KW - metribuzin KW - Pendimethalin KW - pyroxsulam KW - triasulfuron DO - 10.26655/JRWEEDSCI.2022.5.3 N2 - Rumex dentatus L. (toothed dock), a major broadleaf weed, is a severe problem of irrigated wheat in particularly no-till conditions of the rice-wheat system in India. Metsulfuron is being used for its control. However, the sole reliance on metsulfuron has led to its resistance evolution in R. dentatus. Pot bioassay studies confirmed high level of metsulfuron resistance with GR50 values ranging 74 to 98 times to that of the most susceptible population. Metsulfuron resistant (MR) populations had indicated cross-resistance to other ALS inhibitor herbicides, triasulfuron, pyroxsulam, and florasulam. The ready-mix combination of halauxifen methyl + florasulam was also poor against MR populations. The most sensitive and resistant populations had GR50 values of 0.11 and 10.31, 1.0 and 269.5, <0.94 and >30, <1.13 and 3622.5, 0.16 and 10.14 g/ha for metsulfuron, triasulfuron, florasulam, pyroxsulam, and pre-mix of halauxifen + florasulam, respectively. Results showed a high resistance level in R. dentatus against ALS inhibitor herbicides. In addition, a large number of populations (119) were also screened across broad herbicide groups used in wheat and 68.9 % populations exhibited ≤ 50 % control with a recommended field rate of metsulfuron 4 g/ha, indicating the widespread resistance. However, MR- populations were sensitive to pendimethalin, isoproturon, 2,4-D, fluroxypyr, metribuzin, carfentrazone and flumioxazin. So, these herbicides in rotation and as mixture can be used to manage ALS inhibitor herbicide resistance. However, for long-term sustainable management of herbicide-resistant R. dentatus, alternative herbicides should be integrated with best agronomic practices to restrict its infestation in wheat. UR - https://www.jrweedsci.com/article_154741.html L1 - https://www.jrweedsci.com/article_154741_cc6692b6d14c795a7ef8ee81ed965a52.pdf ER -