Description:

• Cool and humid weather conditions, neutral to acidic soils, and high soil moisture are favourable conditions for the occurrence of this disease.

Damage Symptoms:

• Pale yellow to greyish angular spots appear on the upper epidermis of the leaves.
• Grey to white mould can be observed on the lower surface of the leaves.
• The affected plant parts become curled and distorted, resulting in reduced photosynthesis.
• In severe cases, early shedding of leaves, stunted plant growth, and poor formation of heads can be observed.

Preventive Measures:

• Minimize overhead irrigation to reduce high relative humidity on the leaf surface and ensure proper spacing between plants.

Control Measures:

• Apply Mancozeb, Chlorothalonil, or Metalaxyl-M.