How to Protect Tomatoes From Grey Leaf Mold

If the leaves of your tomato plants are covered with a dull, powdery film and yellow spots, grey leaf mold could be the culprit. Grey leaf mold, or spots, is more common in greenhouse tomatoes because of the higher humidity and lack of airflow. The mold spreads by spores and, if not properly treated, will infect the entire crop. Create ideal conditions to prevent the formation and spread of grey leaf mold.

Dehumidifier

Instructions

- 1
  Water the tomato plants first thing in the morning. This allows the day’s warmth to evaporate the leave’s water droplets, cutting down the mold’s formation. Avoid watering the leaves directly and instead concentrate the liquids on the soil and roots.
- 2
  Lower the greenhouse or growing room’s humidity. Install a dehumidifier or turn up the heat to create a drier environment that is not favorable to mold formation.
- 3
  Provide the tomato plants with adequate ventilation, both during the day and at night. This keeps the leaves cool and dry, preventing the mold from growing and spreading.
- 4
  Remove any diseased leaves immediately after you notice them. Pull the leaves off with your hands and dispose of them in the trash. Do not attempt to mulch or compost the leaves, which would spread the mold.
- 5
  Avoid crowding the greenhouse or growing room with an excessive number of plants. Give the tomato plants adequate room to grow and receive airflow.

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