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Plum Pox(Shakra)



P_plumpox

Plum Pox(Shakra)

Usually appear in

Spring to Autumn.


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Caused By:-     The Plum Pox Virus

Description

Plum pox disease is caused by a virus the plum pox virus (PPV). It is also known as Sharka, and can infect a variety of stone fruit species including peaches, apricots, damsons, greengages, plums, nectarine, almonds, and sweet and tart cherries. The virus is transmitted by aphids and as the lifespan of the virus within the aphid is usually less than an hour long distance spread can only be the result of the movement of infected plant materials like rootstock or grafted scoin, to new locations.
The infection eventually results in severely reduced fruit production. There are no known dangers to consumers, but it will ruin the marketability of stone fruit by causing acidity and deformities.
The symptoms vary according to cultivar, age, and nutritional status of the host and may also vary with environmental factors, such as temperature. Severity of symptoms may differ according to the specific strain of PPV.
Sampling of trees is difficult since PPV is not evenly distributed in the tree and some parts of the plant plant may have undetectable concentrations of the virus. The virus may be detected at the bottom of a branch but not at the tip or it may be detected on some fruit and leaves but not others. Symptoms of PPV often appear 3 years following initial infection. However, tests performed in the laboratory can detect the virus before visible symptoms occur. Picture from Wikimedia Commons.


Control

The only way to control this disease is to destroy all infected trees. All susceptible Prunus material intended for planting that is moved into or within Great Britain must have been either officially certified as being free from Plum pox virus or derived from material which has been officially tested and found to be free from the disease within the last three growing seasons.
Plum pox is a notifiable disease. If its presence is suspected on a registered nursery or other registered premises, it must be reported to the Department for Environment, Food and Rural Affairs(DEFRA) Plant Health and Seeds Inspector headquarters.
A genetically modified plum resistant to plum pox virus, named "HoneySweet", has been developed but is not commercially available.


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