The leaf rolling is one of the most important virus diseases of the vine, is determined by the virus called phloem tubuliformi closterovirus.
The leaf curl virus is transmitted through the use of infected propagation material in the planting of vineyards.
In nature, however, is transmitted by vectors such as coccidia (Pulvinaria vitis Linnaeus) and Pseudococcidi.
Symptoms The first symptoms are visible external leaf in early summer, Proceeding of the season intensify to achieve the maximum expression in the autumn.
Clusters: mature late and unevenly, they are also less and have smaller berries with low sugar content.
Fight
shall be examined mainly through preventive practices:
- production and use of propagation material "healthy" certificate.
-keeping in health care nurseries targeted by insecticide treatments against the vectors.
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