Potato leafroll virus
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Potato leafroll virus (PLRV)
The virus is found around the world wherever potatoes are grown and causes a common and serious potato disease. Symptoms start with curling of the leaves, followed by chlorosis and stunting of the plants. The virus is mainly present in the phloem system and sap transport through the phloem is impaired. Young plants are affected most and mature plants have a degree of resistance to the virus. Infected tubers often show internal small necrotic spots and strands. Yield losses can exceed 50%. Epidemics are often initiated through the planting of infected seed potatoes. These become sources of new infections when aphid vectors are present and a few infected tubers per hectare can cause outbreaks.
The virus is transmitted by aphids (mainly Myzus persicae, but also species like Macrosiphum euphorbiae) in a circulative and non-propagative manner. The aphids acquire the virus with the phloem sap they feed on. Aphids then remain infectious for life, but cannot pass it on to their offspring. Other plants species, mainly from the family Solanaceae can also become infected.
|• English:||Potato leafroll virus
|• Español:||enrollamiento de la hoja de la papa|
|• Français:||virus de l'enroulement de la pomme de terre|
Management involves the use of disease-free seed potatoes, the destruction of infected plants and the removal of susceptible weed species and volunteer potatoes. Aphid vectors can be controlled with insecticides.
PLRV has isometric particles, about 24 nm large. The genome consists of a positive sensed, single stranded RNA with 5.8 kb and 8 open reading frames.
Tomato yellow top virus
For a review see Taliansky et al., 2003.