Investigation of resistance problems of phalaris brachystachys Link. (short spiked canarygrass) is problem weed of wheat fileds in Çukurova region against to some wheat herbicides

This study was carried out aim to determine of resistance of Phalaris brachystachys Link. That one of the important weeds of wheat fields in Çukurova Region, against to some herbicides using in wheat in 2008-2009. Possible resistance population was collected from Oksuzlu Village of Kadirli Town of Osmaniye Province. Susceptible population was collected from never herbicide used place like road side and empty field. In study three ACCase inhibitor herbicides (clodinafop-propargyl, pinoxaden ve tralkoxydim) and two ALS inhibitor herbicides (mesosulfuron-methyl+iodosulfuron-methyl-sodium) were used. Six different doses (N/4, N/2, N, 2N, 4N, 8N) of five herbicides were applicated. Resistance index of possible resistant population was determined against to clodinafo-propargyl at the rate of 11.56 and 10.89 at first an second year respectively and pyroxsulam at the rate of 8.51 and 2.13. at first and second year respectively. Resistance index increased second year than first year but recommended doses were found effective for pinoxaden, tralkoxydim and mesosulfuron-methyl+iodosulfuron-metyl-sodium. In this way, herbicides must applicate whenever need and controlled.