Assessment of the Impact of Farming and Management Factors on Tribenorun Methyl Resistance of Wild Mustard (Sinapis arvensis) in Wheat Fileds of Golestan Province

A study was conducted to evaluate the impact of farming and management factors on resistance of wild mustard to tribenorun methyl in Golestan province in collaboration with the Iranian Research Institute of Plant Protection and Mohaghegh Ardabili University from 2014 to 2016. Relative resistance was determined by screening the collected seeds of suspicious biotypes from all regions of the Golestan province. The relationship between herbicide resistance and farm records from agricultural, management and technical aspects was evaluated by ordinal logistic regression model of proportional odds models. The result showed that crop rotation and wild mustard density had significant impacts on the development of resistance at 95 percent level of probability. Under regular spring rotation, the risk of resistance was 6.165 times lower than the reference rotation (autumn rotation). Wild mustard at high density (reference density) had 3.69 times greater risk of developing resistance than of the lower density. Type of tillage, sowing date and irregular use of herbicides compared with farmer’s lack of awareness of technical issues had no significant effect on the risk of resistance. Determining the effects of different factors in the development of herbicide resistance might result in more effective management of weeds.