|A grape leaf showing downy mildew and powdery mildew|
A serious disease in cool, damp seasons.
The initial symptoms of downy mildew appear on leaves as light green to yellow spots, then as it develops it becomes a downy grey mould. Leaves slowly die back and shrivel from the tips. Onion bulbs infected become soft and are not suitable for storage.
None. Should the disease be confirmed on site, immediately dispose of diseased material in sealed bags or bins and arrange for it to be destroyed.
- Try to ensure any starting plant material is disease free.
- Provide good air circulation and ventilation in glasshouses.
- Try to avoid long periods of high humidity and leaf wetness.
- Avoid watering crops late in the day.
- Apply a routine preventative fungicide programme to minimise disease risk, especially during periods when environmental conditions are favourable for downy mildew infection.
- Practice good nursery hygiene by cleaning up plant debris between crops and at the end of the season and use appropriate disinfectants.
- ↑ Hessayon, D.G. (2009). The Vegetable & Herb Expert. Transworld Publishers, London. p. 75. ISBN 9780903505468
- ↑ a b McPherson, M. and Brough, W. (2009) "Good Horticultural Practice for the Prevention and Control of Impatiens Downy Mildew (Plasmopara obducens)". Agriculture and Horticultural Development Board. Retrieved 2010-07-17.
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|Basil · Lavender · Lemon balm · Marjoram · Mint · Oregano · Rosemary · Sage · Savory · Thyme|
|Diseases||Downy mildew · Fusarium wilt · Grey mould · Powdery mildew · Rhizoctonia solani · Rust · Septoria leaf spot of lemon balm · Verticillium wilt|
|Pests||Aphid · Cabbage whitefly · Capsid bug · Celery fly · Leaf miner · Leafhopper · Red spider mite · Shore fly · Silver Y moth · Slug|