Status and evaluation of herbicide resistance in Rumex dentatus L. and its management in wheat
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Date
2020-12
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CCSHAU, Hisar
Abstract
Herbicide resistance in Rumex dentatus in wheat could be a major sustainability issue, which can put the
rice-wheat cropping system (RWCS) in IGP under serious threat. The investigation entitled “Status and
evaluation of herbicide resistance in Rumex dentatus L. and its management in wheat” comprising of a wellstructured
survey carried out during rabi season of 2018-19 (end of January to February 2019), a pot bioassay
study conducted at screen house, CCS HAU Regional Research Station, Karnal during rabi season of 2018-19 and
a two year field experiment, carried out during rabi seasons of 2017-18 and 2018-19 at KVK, Panipat. The survey
was conducted in three districts (Panipat, Karnal and Kurukshetra) of Haryana. Two blocks were selected from
each district and two villages from each block and a total number of 120 farmers were covered from 12 villages
involving 10 farmers from each village.
The diagnostic survey in three districts of Haryana indicating that the use of metsulfuron-methyl is
decreasing over the years from 61.1% in 2016-17 to 23.8% in 2018-19 and that of metribuzin is increasing from
6.49% in 2016-17 to 41.27% in 2018-19. Majority of farmers apply herbicide for control of R. dentatus during 35-
35 DAS. More than 80% farmers use flood jet/ cut nozzle instead of using recommended flat fan nozzle by only
19% of total farmers. Almost all farmers have heard about herbicide resistance (99.9%) and they follow herbicide
rotation (85.8%) after an average of 2.04 years. Spraying was done mostly by hired labor (70.3%) but in the
presence of farmers. Around 75% farmers do not follow crop rotation. Farmers perceptions about poor efficacy of
herbicide were mainly poor quality of herbicide and herbicide resistance. Overall farmers assign first rank to 2,4-D
with 1.36 rating and after 2,4-D, metribuzin was the second choice of farmers and assign 1.45 rating. Farmers have
assigned 3rd position to clodinafop+ metribuzin with 2.07 rating. Metsulfuron-methyl was reported for not showing
any control, so it was placed at last position by farmers with overall 2.96 rating. The numbers of farmers going for
second spray was increased from 15.9% in 2016-17 to 55.6% in 2018-19 similarly numbers of farmers going for
herbicide > 1 to 2 X dose of herbicide has been increased from 5.6% in 2016-17 to 53.0% in 2018-19. It may be
concluded that there is problem with control of R. dentatus particularly by use of metsulfuron-methyl in Haryana.
From pot bioassay study, it can be concluded that three biotype of R. dentatus viz.Ujha, Bhagwanpur and Gudha
have been found resistance to metsulfuron-methyl at graded doses. None of the biotype was found resistance of
carfentrazone-ethyl and 2,4-D. The findings of the study established that problem of resistance in R. dentatus in
Haryana. From the field experiment, it can be concluded that pendimethalin (1000 g ha-1), 2,4-D ester (600 g ha-1),
2,4-D Na (1000 g ha-1), carfentrazone+ metsulfuron (25 g ha-1) were found at par to weed free treatment and also
found as best treatments for controlling resistance population of R. dentatus and beside these carfentrazone-ethyl
(20 g ha-1), 2,4-D amine (750 g ha-1) and metribuzin (210 g ha-1) were also found effective for controlling
resistance population of R. dentatus. In nutshell, based on this study it may be concluded that resistance has started
developing in R. dentatus against metsulfuron-methyl and 2,4-D, carfentrazone-ethyl, pendimethalin,
carfentrazone+ metsulfuron and metribuzin could be used as alternate herbicide with proper spray techniques.