Nasim Ahmad Yasin, Shakil Ahmed, Waheed Ullah Khan, Yaseen Ashraf
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Survey and Pathogenicity of Black Spot Disease of Rose in Pakistan
Black spot disease has become a serious constraint for successful cultivation of rose crop in Pakistan and rest of the world. The current research was conducted to identify the causal pathogen and respective disease severity in 4 districts of province Punjab, Pakistan. The most prominent symptoms of disease included formation of purple to black spot (5-15 mm) with/without yellow margins especially on older leaves. Mortality of infected plants was also observed in severely infected plants. It was observed that Diplocarpon rosae was the casual organism of this disease. The greenhouse experiment revealed variation in pathogenicity of different pathogenic strains.
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