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Though rose plants are one of  the most popular flowering plants, they do not grow properly unless proper care is taken as they are vulnerable to many diseases. Natural rose species are more hardy, but hybrid roses need special care and regular spraying of  insecticides.

 

 Blackspot is one of the most common rose disease caused by a fungus diplocarpon rosae. It is common during rainy weather and is spread by water splashing from infected leaves.  Circular black spots up to half an inch in diameter are formed on leaves, which may be surrounded by a yellow area. The infected leaves fall off the plant . Stems may also be affected and develop reddish areas. The growth of  the rose plant is affected. 

 

 By spraying with a fungicide at regular intervals, rose plants can be protected from Blackspot.  Captan, copper hydroxide, copper sulfate pentahydrate, ferbam, mancozeb are some of  the fungicides used. Old leaves and mulch infected with the fungus should be removed at regular intervals. The leaves of  the rose plant should be kept dry to the extent possible.

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