Tomato Yellow Leaf Curl Virus

  • Symptoms

  • Trigger

  • Biological Control

  • Chemical Control

  • Preventive Measures

Tomato Yellow Leaf Curl Virus

TYLCV

Virus


In a Nutshell

  • Yellow and curled leaves.
  • Stunted growth.
  • Less number of fruit.

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.
  • Plant early to avoid peak populations of the whitefly.
  • Intercrop with rows of non-susceptible plants such as squash and cucumber.
  • Use nets to cover seedbeds and prevent whiteflies to reach your plants.
  • Avoid to plant alternative host plants close to your crops.
  • Mulch the seedbed or the field to break the life cycle of the whitefly.
  • Use sticky yellow plastic traps to mass-catch the insect.
  • Monitor the field, handpick diseased plants and bury them away from the field.
  • Find and eradicate weeds in and around the field.
  • Plow deep all plant debris after harvest or burn them.
  • Practice crop rotation with non-susceptible plants.