This presentation talks about a virus, potato virus Y that affects many crops including potatoes. it leads to massive losses and increases the cost of production. When well understood, one can make an early diagnosis and avert losses. One can also put preventive measures so as to lower the risk of it getting to the farm.

1. POTATO VIRUS Y DISEASE

2. Introduction
• Potato virus Y first isolated in 1930s
• It belongs to the genus potyvirus
• It causes yield losses and threatens food security
• Can cause from 20-100% losses
• There are different strains of the virus
• Potato virus Y is the most destructive among
viral diseases of potato

3. ETIOLOGY
• Potato virus y disease is caused by potato virus Y that is a potyvirus
• It’s a monopartite single stranded RNA virus that affect solanaceous
plants
• There are different strains including the most common PVYO
• It is primarily caused by green peach aphids and potato aphids
• PVY is transmitted non-persistently
• Aphids feeding on an infected plant picks up the virus within 1-2
seconds of feeding

4. SYMTOMATOLOGY
• Sunken necrotic dark brown rings
on the tuber
• Death of growing points
• Stunted growth
• mottled or distorted leaves
• Leaf mosaic and necrosis
• Tuber cracking

5. DISEASE DEVELOPMENT
• The virus gains entry into host through injuries or vector
• The viral RNA disassembles, replicate and converts its mRNA to
proteins
• The virus moves to neighbouring cells and spreads systemically to the
whole plant
• There is expression of symptoms

6. TRANSMISSION
• Vector transmission by aphids
green peach Myzus persicae
potato aphid macrosiphum eurphorbiae
• Through injury of the plant

7. ECONOMIC IMPORTANCE
• Most important viral disease of potato
• Can cause 20-100% yield loss
• Reduces the quality of the tubers
• Leads to decrease production of certified seeds
• Brings about high cost of production

8. MANAGEMENT
• Use of certified seeds
• Rogue any plant showing symptoms
• Destroy any volunteer plant in the field
• Maintain high levels of hygiene
• Use of border crop to keep aphids away
• Plant PVY free potato seeds

9. REFERENCES
• Christophe Lacomme, L. G. (2017). Potato virus Y: biodiversity,
epidemiology and management. springers international publishing .
• El-Aziz, M. H. (2020). The importance of Potato virus Y. Journal of
plant science phytopathology, 009-015.
• Kaguongo, W. G. (2008). Farmers practices and adoption of improved
varieties in Kenya and Uganda. Social sciences , 5-85.
• Sunita Yadav, A. K. (2018). Molecular aspects of plant-pathogen
interaction. Springer.
• Tolin, S. (2008). Tobacco viruses. Encyclopedia of virology, 60-67.

10. THANK YOU