Volume Issue Year Page No Type PDF Download
55 3 2023 311 - 314 Research note
Susceptibility of long-term unexposed population of Phalaris minor to isoproturon
Gurpreet Kaur, Tarundeep Kaur and M.S. Bhullar
DOI : http://dx.doi.org/10.5958/0974-8164.2023.00057.6
Email : gurpreet-kpr@pau.edu
Address : Department of Agronomy, Punjab Agricultural University, Ludhiana, Punjab 141004, India

Keywords

GR50, Herbicides, Isoproturon, Phalaris minor, Reverse resistance, Wheat 

Abstract

Phalaris minor populations (95 No.) were collected from 14 districts of Punjab. All these populations were not exposed to isoproturon for more than 15 years. Plants of each population/pot were planted and treated with the graded doses of isoproturon 75WP (234.5, 469, 938, 1876, 3752 g/ha) 30 days after sowing as per treatment. The mortality data was recorded and converted to morality percentage in relation to untreated control populations. Nonlinear regression analysis was used to determine the mean dose that caused mortality by 50% (GR50). Out of 95 Phalaris minor populations, isoproturon (IPU) at 938 g/ha provided more than 90% mortality in 39 populations and 70-90% mortality in 17 populations, respectively.
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