The evaluation of efficiency selective herbicide and time of application on weed control wild oat (Avena ludoviciana L) in wheat fields

Subject Areas : Journal of Plant Ecophysiology

Kh. Taheri ¹ , H.R. Ebrahimi ² , A. Jafari ³

1 - دانشجوی کارشناسی ارشد دانشگاه آزاد اسلامی واحد ارسنجان
2 - استادیار دانشگاه آزاد اسلامی واحد ارسنجان
3 - استادیار دانشگاه آزاد اسلامی واحد ارسنجان

Received: 2014-09-24 Accepted : 2014-09-24 Published : 2014-09-01

Keywords: Wheat, wild oat, Weeds, tillering, Dry weight,

Abstract :

In order to evaluate selective herbicides at different times on wild oat control in wheat field, a factorial experiment in terms of randomized complete block design (RCBD) with four replications was conducted at Marvdasht, Fars during planting seasons in 2011-12. Four selective and common herbicides (Atlantis OD (mesosulfuron-methyl and iodosulfuron-methyl-sodium), Total (metsulfuron methyl and sulfosulfuron), Topic (Clodinafop propargyl( and Puma Super (Fenoxaprop-p-ethyl) and four application times (6-8 leaf stage of wheat, early tillering, mid-tillering and early jointing stage) were considered as the first and second factors, respectively. Results showed that there was significant difference between the times of application and selective herbicides to control wild oat weeds (p > 0.05). The results of mean comparison in relation to the application times revealed that the highest and the lowest control levels of wild oat weed were in the stages of mid-tillering and early jointing, respectively. The findings in relation to the selective herbicides also showed that the highest dry weight (DW) of weeds was obtained in both of Topic and Puma Super herbicides. The lowest DW of wild oat weed was observed in both Atlantis OD and Total herbicides. The results of yield and yield components showed that the highest grain yield obtained when the herbicide was applied at mid-Tillering stage. Herbicide application at the jointing stage due to lack of proper control of weeds led to a decrease in wheat yield level. Application of Atlantis OD herbicide at 6-8 leaf stage of wheat can cause severe burning of wheat and thus may decrease its yield. In general, it is recommended that acetyl coenzyme A carboxylase family of herbicides which has a high degree of resistance to weeds not to be used.