Investigating Resistance of Wild Mustard (Sinapis arvensis) Populations to Acetolactate Synthase Inhibiting Herbicides in Wheat Fields of Khoozestan, Gorgan and Kermanshah Provinces

To study the resistance of wild musturd populations to acetolactate synthase inhibitors، 31 suspicious wheat fields to resistance (included of 14، 12 & 5 fields located in Golestan، Khoozestan & Keramanshah، respectively) were studied during 2012. Some important management information was analyzed in the first part of experiment. In the second part، the effect of three acetolactate synthase inhibitor herbicides (ALS) including of Tribenuron methyl (Granstar)، sulfosulfuron + metsulfuron-methyl (Total) and Iodosulfuron methyl sodium+Mesosulfuron Methyl+Mephen payer (Atlantis) on the growth of suspicious populations was examined on the base of complete randomized block design. To study dose-response reactions، different doses of mentioned herbicides were sprayed on resistant populations (G3، G4 & G5 of Gorgan، Kh1، Kh5 & Kh7 of Khoozestan and Ker1 of Kermanshah) and three sensitive populations (G9، Kh3 & Ker1 of mentioned province) in the third part of this experiment. According to the results of the first part، the only crop sequence of herbicides was not observed in more than 80% of the fields and wheat was cropped as in 39% of these fields. In addition، Khoozestan had the weakest crop rotation with 50% single cropping. The results of second part showed that 20% and 10% of populations were resistant to Tribenuron methyl and sulfosulfuron + metsulfuron-methyl respectively، but، high resistance to Iodosulfuron methyl sodium+Mesosulfuron Methyl+Mephen payer. Also، 10% of populations were resistant to Tribenuron methyl and sulfosulfuron+metsulfuron-methyl. According to the results of dose-response experiment، G3، G4، G5 (Golestan) and Kh7 (Khoozestan) populations had low، Ker2 (Kermanshah) had medium and two populations of Kh1 and Kh5 (Khoozestan) had high resistance to Tribenuron methyl. In addition، Kh5، Kh7 (Khoozestan) and G3 (Golestan) had low، medium and high resistance to sulfosulfuron+ metsulfuron-methyl، respectively.