The public extension organizations are the most important actor for the transfer of sustainable agriculturalpractices to the farmers in Turkey. In this study, public extension workers evaluated the sustainability levels ofthe farmers' practices. For gathering the data, interviews with 177 public extension workers were done in lzmir,Manisa, and Aydın Provinces. The average age of extensionists is 38.7 and 81.9% of them graduated fromagricultural faculties. The professional experience of extension staff is 12 years on average in the research area.The targets in extension activities are different according to the provinces. Productivity increase in Manisa andenvironmental protection in lzmir are the priorities of agricultural production. Extensionists, who graduatedfrom the agricultural faculties, pay more attention to sustainable applications. The Farm Sustainability Indexwas developed to measure the sustainability levels of farmers' practices in the study. According to theextensionists, 36.2% of the farmers are not sustainable. Generally, farmers have low level of sustainability.There is no difference between farmers in terms of sustainability by the provinces. The adoption levels of somebasic sustainable suggestions such as protection ofthe grassland, regular soil analysis, green fertilization, takingerosion protection preventions by farmers are not at intended level in the region. The awareness should becreated through training and introducing activities on sustainability in rural areas. ln case of adopting ofsustainable practices, the positive impact is not limited in the farmer's field, it contribute to environmental and community health, too.