![]() To avoid infection from soil-borne resting spores, practice crop rotation for vegetables, and avoid re-planting with the same host for at least a year where an ornamental plant has been affected.Water early in the morning so that leaf surfaces dry out rapidly Avoid watering plants in the evening, as this can lead to high humidity or leaf wetness that persists throughout the night.Open the doors and vents, when conditions allow, encouraging air movement In glasshouses, try to avoid prolonged leaf wetness or periods of high humidity.Avoid dense planting and control weeds, so that there is good air circulation around the plants.Remove and destroy severely affected plants.Pick off and dispose of (by deep burial, burning or consigning to the council green waste) affected leaves as soon as symptoms are seen.columbine, Impatiens, tobacco plant) the plant may die Severely affected plants are often stunted and lack vigour.cauliflower curds, Impatiens flower buds, pea pods Occasionally, other plant parts can be affected, e.g.tobacco plant), or turn yellow and fall prematurely (e.g. Severely affected leaves may shrivel and turn brown (e.g.foxglove, rose) it can be difficult to see, even with a hand lens pea, pansy) the growth is easy to see with the naked eye. This growth may be white, grey or purple, depending on the species of downy mildew A mould-like growth on the underside of the leaf, corresponding to the blotch on the upper surface.on lettuce) if they are bordered by the leaf veins These may be pale green, yellow, purple or brown, depending on the plant affected. The blotches sometimes have straight edges (e.g. Discoloured blotches on the upper leaf surface. ![]() Unlike p owdery mildews, plants affected by downy mildew are not so easy to recognise. RHS Botanical Art and Photography Show - TBC July 2024.RHS Flower Show Tatton Park - 17-21 July 2024.RHS Hampton Court Palace Garden Festival - 2–7 July 2024.RHS Garden Wisley Flower Show - 5–10 September 2023.RHS Garden Rosemoor Flower Show - 18–20 August 2023. ![]()
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