Crown gall disease is an important disease of roses worldwide and can affect roses of all ages. Crown Gall Disease is caused by the bacteria Agrobacterium tumefaciens. It causes the formation of galls or tumors on the stem, roots or crown of the plant, which can lead to stunted growth and even death. In this article, we will explore the causes, symptoms, favorable conditions for disease development and management practices.
Crown gall disease is also a threat to the nursery industry, as infected plants can serve as a source of infection for healthy plants. The development of crown gall disease of rose is influenced by the disease triangle, which includes the presence of the pathogen, susceptible host, and favorable environmental conditions. The disease is favored by warm and moist conditions and can spread rapidly under such conditions.
The disease cycle of crown gall disease of rose includes primary infection and secondary infection with mode of survival.
Scientific Name: Agrobacterium tumefaciens
Crown gall disease of rose is a widespread disease in India, affecting rose plants in many states. Some of the major affected states include Uttar Pradesh, Tamil Nadu, Maharashtra, Karnataka, and Punjab.
The symptoms of crown gall disease of rose vary depending on the severity of the infection.
Crown gall disease management can be achieved through cultural practices, mechanical control, biological control and chemical control.
Cultural practices such as crop sanitation, crop diversification and soil management are crucial in controlling crown gall disease.
One approach to biologically control crown gall disease is the use of soil amendments such as Agrobacterium radiobacter K84, which is a non-pathogenic strain of Agrobacterium Radiobacter that can outcompete the pathogenic strains for space and nutrients. This can be used to prevent the colonization of the pathogenic bacteria in the first place.
Chemical control of crown gall disease can be achieved by applying certain fungicides and bactericides. Some of the commonly used chemicals are,
Product Name | Technical Content | Dosage |
Kocide Fungicide | Copper Hydroxide 53.8% DF | 2 gm/lit of water |
Dhanuka Kasu B Fungicide | Kasugamacyin 3% SL | 2-3 ml/lit of water |
Conika Fungicide | Kasugamycin 5% + Copper Oxychloride 45% WP | 1.5-2 gm/lit of water |
Crystocycline Bactericide Antibiotic | Streptomycin sulphate 90% + Tetracylin hydrocloride 10% sp | 0.1 gm/lit of water |
Blitox Fungicide | Copper Oxychloride 50% WP | 3gm/lit of water |
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