Rose plants, often referred to as the “King of Flowers”, are highly prized for their beauty, fragrance and versatility. However, these rose plants are also vulnerable to several diseases, one of the most prevalent of which is blackspot. Blackspot is a fungal disease that affects roses, and it is one of the most widespread and damaging diseases in rose cultivation. Blackspot is a major concern for rose growers because it can significantly reduce the quality and yield of roses. In severe cases, blackspot can kill the plant entirely, resulting in significant financial losses for growers.
Blackspot is favoured by warm and humid conditions, with temperatures ranging between 20-30°C and relative humidity between 70-80%. Prolonged periods of leaf wetness due to heavy rainfall, overhead irrigation, or frequent morning dew also contribute to the development of the disease.
Scientific Name of Pathogen: Diplocarpon rosae
Blackspot is a widespread disease in India and affects rose plants in many parts of the country. Some of the most affected states include Maharashtra, Karnataka, Tamil Nadu, West Bengal, and Uttar Pradesh.
Cultural practices are the first line of defense against blackspot. Some important practices include:
In cases where cultural, mechanical and biological control strategies are not sufficient to control black spot, adoption of chemical method of control may be necessary. There are several fungicides available for controlling black spot in roses, including:
Product Name | Technical Content | Dosage |
Kavach Fungicide | Chlorothalonil 75% WP | 1-2 gm/liter water |
Ridomil Gold Fungicide | Metalaxyl 4% + Manconzeb 64% WP | 1-1.5 gm/liter water |
Kocide Fungicide | Copper Hydroxide 53.8% DF | 2 gm/liter water |
Multiplex Neel Cu | Copper cheated with EDTA (12.0 %) | 0.5 gm/liter water |
Indofil M45 Fungicide | Mancozeb 75% WP | 3-4 gm/liter water |
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