Weeds not only cause yield and quality losses in cultivated plants but also hinder harvesting. To effectively reduce these negative effects, it's crucial to identify the weed species choose most appropriate control method. Conducting regular surveys areas where crops are grown is essential for this purpose. This study was carried out determine types, densities, frequency of occurrence barley, w...

Many polymorphisms exist in field bindweed (Convolvulus arvensis L.) populations. These differences that appear especially in their flower and leaf cause to different biotypes of this weed that are different in view of dry weight, rate- and flowering period. This research was accomplished during 2005 to 2006 at Weed Research Department, Iranian Plant Protection Research Institute for identifica...