Symptoms of Verticillium dahliae on tomato

• Organs attacked  :

Verticillium dahliae mainly attacks the vascular system of plants, but symptoms are also on the leaves.

• Symptoms :
  • Discreet withering of the lower leaflets at the hottest times of the day, reversible during the night.
  • Softening and progressive yellowing of sectors of the leaf blade, often interveinal and V-shaped (figures ). These eventually turn brown and become necrotic.
  • Premature death of leaflets and leaves, leaving fruits exposed to the sun.
  • More or less marked browning of the vessels of the lower part of the stem extending over time and reaching the branches.
  • Weakening of plants and reduction of yields.

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• Signs  : no particular signs present on the plants.
• Possible confusion : other Solanaceae vascular diseases ( Bacterial wilt , Fusarium).

• Production areas affected: