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Not AvailableMosaic disease is one of the most important diseases in the production of watermelon under arid and semi-arid regions of India. Field trials were conducted to screen 13 watermelon/mateera genotypes viz., RW-I77-3, RW-187-2, GP¬20, GP- 35, GP- 42, Thar Manak, AHW- 19, AHW- 65, Asahi Yamato, Sugar Baby, Arka Manik, Bikaner Local-I and Barmer Local-I for resistance against mosaic disease with normal cultivation practices during summer 2011 and 2012 at Plant Pathology Block of Central Institute For Arid Horticulture, Bikaner under field conditions. Resistant genotypes were categorized on the basis of disease incidence. Among 13 watermelon/mateera genotypes, none was found immune against disease. One variety 'Asahi Yamato' showed resistance with less than 10.0% disease incidence, ten genotypes were categorized as moderately resistant ranging from 10.1 to 25.0% disease incidence and two genotypes such as RW-I77 -3 and GP- 20 having more than 25.0% disease incidence proved susceptible against mosaic disease.Not Availabl