Sandalwood Spike Disease

• 28 Sep 2020

Why in News

India’s sandalwood trees are facing a serious threat due to Sandalwood Spike Disease (SSD).

Key Points

• The natural population of sandalwood in Marymoor Sandal Forest of Kerala and various reserve forests in Karnataka, including MM Hills (Malai Mahadeshwara Wildlife Sanctuary), are heavily infected with SSD.
• Sandalwood Spike Disease:
  
  • It is an infectious disease which is caused by phytoplasma.
    
    • Phytoplasmas are bacterial parasites of plant tissues — which are transmitted by insect vectors and involved in plant-to-plant transmission.
  • There is no cure as of now for the infection.
    
    • Presently, there is no option but to cut down and remove the infected tree to prevent the spread of the disease.
  • The disease was first reported in Kodagu, Karnataka in 1899.
    
    • More than a million sandalwood trees were removed in the Kodagu and Mysore region between 1903 and 1916.
• Concerns: About 1% to 5% of sandalwood trees lost every year due to the disease, scientists warn that it could wipe out the entire natural population if measures are not taken to prevent its spread.
  
  • Another concern is, any delay in arresting the trend may result in the disease spreading to cultivated sandalwood trees.
• Reason: The present rapid spread of the infection is largely due to restrictions on green felling in forests, which has allowed vectors to spread the disease to healthy trees.
  
  • Green felling (silviculture felling) is the felling of green trees of one or more types.
  • Silviculture is the art and science of controlling the establishment, growth, composition, health, and quality of forests and woodlands to meet the diverse needs and values of landowners and society such as wildlife habitat, timber, water resources, restoration, and recreation on a sustainable basis.
• Recent Steps: In an effort to combat the killer disease, the Institute of Wood Science and Technology (IWST), Bangalore will join hands with the Pune-based National Centre for Cell Sciences for a three-year study, initiated by the Union Ministry of AYUSH with a financial allocation of Rs. 50 lakh.
  
  • IWST is a Centre of Excellence for Sandalwood Research and Wood Science.

Red Sandalwood

• Red sanders (Pterocarpus santalinus) is endemic to South India.
• They are found in the Tropical Dry Deciduous forest of the Palakonda and Seshachalam hill ranges of Andhra Pradesh and also found in Kerala, Tamil Nadu and Karnataka.
• Red Sanders usually grow in the rocky, degraded and fallow lands with Red Soil and hot and dry climate.
• The International Union for Conservation of Nature (IUCN) has put it under the category of near threatened from earlier endangered species in the Red List.
• It is listed in Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES).
  
  • Appendix II – Species which are not necessarily threatened with extinction, but in which trade must be controlled to avoid utilisation incompatible with their survival.
• It is known for its rich hue and therapeutic properties, is high in demand across Asia, particularly in China and Japan, for cosmetics and medicinal products, wood-works and musical instruments.
• Its popularity can be gauged from the fact that a tonne of red sanders costs anything between Rs. 50 lakh to Rs. 1 crore in the international market.

Source: TH