Plant Virus and Viroid Diseases in the Tropics
Plant virus and sub-viral pathogens pose severe constraints to the production of wide range of economically important crops worldwide. The crops raised both through true seed and vegetative propagated materials are affected with number of virus and virus-like diseases. The virus may enter into plants through seed planting materials or by vectors. Once the virus is in the field, it multiplies and spreads following definite patterns depending upon the nature of the vector and agro-meteorological conditions. Disease free crops and plants are great economic and social importance in feeding the world's population. Detection of virus and sub-viral agents at initial stages of infection is critical to reduce economic losses. For nearly two decades, ELISA and its variants played a major role in large scale virus testing and also in the production of virus-free planting materials.
Virus and virus-like diseases in tropical countries were described along with assessment of yield losses, transmission and diagnostic tests for framing suitable management measuresLatest 9th ICTV classification in relation to tropical virus diseases is presentedFor quick and reliable diagnosis of virus and viroid diseases latest molecular techniques with suitable examples were discussed