Plant disease
Pathogen: Fungi of the order Erysiphales
A white, powdery coating on leaves, shoots and buds. The leaves turn yellow, become deformed and drop prematurely.
Remove infected parts, spray with sulphur- or triazole-based fungicides, and in milder cases use preparations based on plant extracts.
Ensure good air circulation, avoid wetting the leaves when watering, and keep nitrogen feeding moderate.
Flowers Begonia semperflorens
Perennials Chrysanthemum × morifolium
Vegetables Cucurbita pepo
Flowers Zinnia elegans
Trees Quercus robur
Perennials Phlox paniculata
Shrubs Hydrangea paniculata
Shrubs Hydrangea macrophylla
Fruit Malus domestica
Perennials Echinacea purpurea
Shrubs Syringa vulgaris
Flowers Lilium
Herbs Mentha × piperita
Vegetables Cucumis sativus
Vegetables Capsicum annuum
Flowers Pelargonium × hortorum
Perennials Paeonia lactiflora
Vegetables Solanum lycopersicum
Shrubs Rosa × hybrida
Shrubs Rhododendron hybridum
Perennials Rudbeckia fulgida
Vegetables Lactuca sativa
Flowers Helianthus annuus
Perennials Fragaria × ananassa
Shrubs Euonymus fortunei
