Diseases of Vegetable, Ornamental and Spice Crops

Lecture 26

Introduction:

Rose [Rosa spp. (Rosa moschata, R. chinensis, R .indica)] is a woody perennial plant, within the family Rosaceae. There are more than 100 species. They form a group of erect shrubs and climbing or trailing plants, with stems that are often armed with sharp prickles. Flowers are large and showy, in colours ranging from white through yellows and reds. Most species are native to Asia, with smaller numbers native to Europe, North America, and northwest Africa. Species, cultivars and hybrids are all widely grown for their beauty and fragrance. Rose plants range in size from compact, miniature roses, to climbers that can reach 7 meters in height. Different species hybridize easily, and this has been used in the development of the wide range of garden rose. During cultivation, roses are infected with many diseases which not only reduce the quality but quantity of flowers. This lecture deals with the bacterial and viral diseases infecting this crop along with their management.