When it infects plants at the seedling stage, TYLCV causes severe stunting of young leaves and shoots, resulting in a somewhat bushy growth of the plant. In older plants, the infection results in excessive branching, thicker and wrinkled leaves, and interveinal chlorosis clearly visible on the leaf blade. At later stages of the disease, they take a leathery texture and their chlorotic margins are rolled upwards and inwards. If the infection takes place before the flowering stage, the number of fruits is considerably reduced, even though there are no noticeable symptoms on their surface.
TYLCV is not seed-borne and is not transmitted mechanically. It is spread by whiteflies of the Bemisia tabaci species. These whiteflies feed on the lower leaf surface of a number of plants and are attracted by young tender plants. The whole infection cycle can take place in about 24 hours and is favored by dry weather with high temperatures.
There is no treatment against TYLCV. Control the whitefly population to avoid the infection with the virus.
Once infected with the virus, there are no treatments against the infection. Control the whitefly population to avoid the infection with the virus. Insecticides of the family of the pyrethroids used as soil drenches or spray during the seedling stage can reduce the population of whiteflies. However, their extensive use might promote resistance development in whitefly populations.
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