Hi Tui, how do I treat mould/mildew on my marrow plant leaves?
Avoid overhead watering and water in the morning rather than at night. When you water try and water around the base of the plant beneath the foliage, and increase air circulation around the plant.
Talk to your local garden centre about a suitable fungicide spray for powdery mildew that is safe to use on edible crops. Remove and destroy any infected plant material rather than composting.
Thanks, Tui Team.