Tomato Yellow Leaf Curl Virus

  • Symptoms

  • Trigger

  • Biological Control

  • Chemical Control

  • Preventive Measures

Tomato Yellow Leaf Curl Virus

TYLCV

Virus


In a Nutshell

  • Thicker and wrinkled leaves, with interveinal chlorosis clearly visible on the leaf blade.
  • The chlorotic margins of leaves are rolled upwards and inwards.
  • The number of fruits is reduced, but no noticeable symptoms are visible on surface.

Hosts

Tomato

Symptoms

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 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.

Trigger

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.

Biological Control

Sorry, we don't know any alternative treatment against TYLCV.

Chemical Control

Always consider an integrated approach with preventive measures together with biological treatments if available. 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.

Preventive Measures

Use resistant or tolerant varieties.,Practice crop rotation with plants not susceptible to the whitefly.,Use nets to cover seedbeds.,Plant early to avoid peak populations of the whitefly.,Use sticky yellow plastic traps.,Mulch the seedbed or the field to break the life cycle of the whitefly.,Intercrop with rows of non-host trap plants such as squash and cucumber.,Monitor the field, handpick diseased plants and bury them.,Avoid to plant alternative host plants close to tomatoes.,Find and eradicate weeds in and around the field.,Plow deep all plant debris after harvest or burn them.