Famous for being vineyard owners’ #1 enemy, downy mildew is a constant threat to grape harvests. This blight also threatens certain other vegetables from the vegetable patch such as tomato and potato, too.
Regularly applied preventive treatment should help you produce a beautiful harvest without any trace of downy mildew.
- Read also: Treating tomato blight and downy mildew
How to recognize downy mildew
Symptoms of downy mildew start with the appearance of several spots on the leaves that encroach on neighboring leaves.
- This is a fungal disease that mainly impacts grape, tomato and potato.
- Brownish spots appear on and under the leaves, and spread until the leaves turn completely brown and fall off.
Conditions in which downy mildew appears and spreads
- Moisture is the main factor that triggers its spread.
- Like most fungal attacks, downy mildew will spread fastest after rain showers.
- Mildew is hindered when plants are spread far apart and air circulates well.
Organic downy mildew treatments
It’s possible to use very effective organic downy mildew treatments.
- Bordeaux mixture is the only effective preventive treatment against downy mildew.
- Apply regularly at the beginning of spring and in fall.
- Treat during the entire vegetative phase.
- Treat regularly, on average every two weeks and after every rainfall.
- In the case that downy mildew appears, only a curative treatment will have any effect.
Downy mildew and baking soda
Baking soda is an excellent solution to treat downy mildew.
- Dissolve 1 table spoon baking soda in 1 quart (1 liter) water (ideally rainwater or mineral water, for the water to be softer).
- In dry weather, spray this mix on all the leaves, spraying both on top and on the underside of leaves.