ACIAR-SRA Result-sharing Workshop PresentationPlace tle here of Results - 1 Occurrence of Sri Lankan cassava Date City, Country mosaic virus (SLCMV) th 19 Your Name Here July 2017, Phnom Penh, Cambodia Your e-mail
[email protected] Nami Minato Outline q Background – CMD and its distribution in Asia region q SRA cassava mosaic disease surveillance q Results and discussion q Notes for group discussion Cassava mosaic disease (CMD) Symptoms & Yield loss n Cassava mosaic disease infected cassava typically shows mosaic symptoms on leaves and leaf curl. n Yield losses attributed to CMD range 20 to (Photo by Sophearith Sok) 95%, and have been reported to be substantially increased following mixed infection. Transmission n Viruses causing CMD are transmitted by 1. Planting materials (cassava cuttings/seeds) 2. Insect vector, whiteflies Cassava mosaic geminiviruses (CMGs) Virus taxonomy n Viruses causing CMD (cassava mosaic geminiviruses: CMGs) belong to family Geminiviridae, genus Begomovirus. n CMD is caused by 11 species of virus, such as p African cassava mosaic virus (ACMV) p Indian cassava mosaic virus (ICMV) p Sri Lankan cassava mosaic virus (SLCMV) n CMD has been spread in Africa for over 200 years, and in South Asia (India and Sri Lanka). Spatial and temporal distribution Cassava mosaic disease in Asia Indian cassava mosaic virus (ICMV) Sri Lankan cassava mosaic virus (SLCMV) In December 2015, SLCMV was reported in Cambodia Initial report (Fauquet & Fargette, 1990, Plant Dis) 1894 African cassava mosaic disease 1956 Indian cassava mosaic disease