Estimation of GR50 values of ACM-9 29WG (clodinofop + metribuzin) and Axial 5EC (pinoxaden) herbicides to control the resistant biotypes of Phalaris minor Retz. collected from different districts of Punjab.
DOI:
https://doi.org/10.59797/ija.v70i3.5974Abstract
The field experiment was conducted at the experimental farm of Department of Agronomy, LPU Phagwara, Punjab, during of 2022-2023 and 2023-2024. To workout GR50 values of ACM9 (174g a.i/ha-R) and Axial (50g a.i/ha-R) at variable levels on four resistant biotypes of P.minor collected from different districts of Punjab, five doses i.e . 0, 1/2R, R, 2R and 4R in main plots and four biotypes of Ferozepur, Ropar, Fazilka and Ludhiana in sub plots were kept. Among different herbicides, higher mortality percentage and less dry matter of P. minor was found in herbicide ACM-9 as compared to Axial during both years. At the recommended level of ACM9 significantly higher mortality and less dry matter was obtained as compare to control. Axial was found less effective as very low mortality percentage was observed even at 4R level during both years. Also significantly less dry matter of P.minor was obtained in 4R level of Axial which was significantly less than all other levels. At the recommended level ( R) of Axial, the mortality percentage and dry matter of P.minor was significantly less than 2R indicating thereby that it is heading towards resistance. Different biotypes showed differential response . Fazilka biotype during both year was found to be more sensitive whereas Ferozepur biotype showed higher resistance to both herbicide during both the years.
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