Workishet et al Greener Journal of Agricultural Sciences Vol. 9(2), pp. 259-267, 2019 ISSN: 2276-7770 Copyright ©2019, the copyright of this article is retained by the author(s) DOI Link: http://doi.org/10.15580/GJAS.2019.2.032819057 http://gjournals.org/GJAS Survey of Cotton Weeds in Middle Awash of Ethiopia Workishet Taye; Silesh Getahun; Zemedikun Alemu; Nurhussien Seid; Sharew Abate Ethiopian Institute of Agricultural Research, Werer Agricultural Research Center, Ethiopia P. O. Box 2003, Addis Abeba, Ethiopia ARTICLE INFO ABSTRACT Article No.: 032819057 Type: Research DOI: 10.15580/GJAS.2019.2.032819057 Cotton is a widely cultivated fiber crop and plays an important role in the globe. In Ethiopia, cotton is produced in small and large scale, but commercial farms are greatly affected by the problem of weed infestations. Weed survey was done in the potential irrigated cotton growing areas of Middle Awash at seedling and flower initiation stages of the crop. From all locations, the specimen was collected and tagged. Identification of the specimen in the field was done based on weed identification guidelines and those specimens difficult to identify in the field were identified by the national herbarium of Addis Ababa University. Frequency, Abundance, Dominance and Similarity Index were done according to their formula. A total of 27 weed species from 17 families were recorded from all locations. The most dominant weed species are from Poaceae, Amaranthaceae, Euphorbiaceous, Malvacea, Convolvulaceae and Asteraceae weed families in all locations. Weed species composition are different among crop growth stage and similar between districts and across districts and hence, a similar management practice will be applied for the districts. Submitted: 28/03/2019 Accepted: 01/04/2019 Published: 13/06/2019 *Corresponding Author Workishet Taye E-mail: workishet@ gmail.com Keywords: Weeds; Cotton; Gossypium hirsutum L. 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