Resistance study of Xanthium strumarium L. species population to the herbicide imazethapyr in the south Banat

Abstract

During four years (2007–2011), resistance of weeds species Xanthium strumarium L. to ALS inhibitors was studied. Seeds of plants for which there existed possibility of resistance occurrence to herbicide imazethapyr were collected from different localities in south Banat, with a long history of ALS inhibitors use in weed control. Studies were performed in Petri dishes assays (Clay and Underwood, 1990), plant studies (Moss, 1995) and testing ALS enzyme activity in vivo (Lovel et al., 1996 a, b). In the trials, as a susceptible standard population of Xanthium strumarium L. from ruderal sites was used. Resistance index was determined in regard to the susceptible population. By comparative analysis, populations R1 and R2 from the site of south Banat increased resistance to the studied herbicide belonging to the ALS inhibitor group.