![]() Space plants well and thin them so that air circulates well.Water early morning so plants only get one “wet time” in the day (synchronize with dew).Avoid performing any other tasks during this phase: brushing against sick plants will spread the fungus fast when wet.Water from below, with a long hose nozzle, long-spout watering can, drip irrigation or ollas. ![]() Preventing downy mildew means ensuring the opposite of these factors: Mildew is hindered when plants are spread far apart and air circulates well.Like most fungal attacks, downy mildew will spread fastest after rain showers.Moisture is the main factor that triggers its spread, especially on leaves.These white spots look a lot like powdery mildew.Ĭonditions in which downy mildew appears and spreadsĭowny mildew particularly likes warm and moist settings, as well as dense foliage that keeps air and light away. On the underside, whitish patches appear that match topside spots.They turn brown and spread to cover the entire leaf which then falls off.Yellow spots appear on and under the leaves.This is a fungal disease that mainly impacts grape, tomato and potato.Symptoms of downy mildew start with the appearance of several spots on the leaves that encroach on neighboring leaves. Read also: Treating tomato blight and downy mildew.Regular preventive treatment should help you produce a beautiful harvest without any trace of downy mildew. This blight also threatens certain other vegetables from the vegetable patch such as tomato and potato, too. Famous for being vineyard owners’ #1 enemy, downy mildew is a constant threat to grape harvests.
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