Mildew

Introduction:

Mildew is the generic name for a series of fungal diseases affecting many species of plants. Contrary to what has long been thought due to its appearance, mildew is not caused by fungi, but by algae, which explains its extreme sensitivity to copper.

Symptoms :
Spots yellow / brown oily appearance on the top leaves and whitish or gray corresponding mark on the underside of the leaves, visible time humide.Les leaves shrivel up and wither. Brown spots on the plants shrivel and die tiges.Les. vegetables are suffering bumps and dark spots.




Dates:
High humidity, rain successive without drying, and mildew by species, freshness (peas) or heat (potato, tomato) 

Risk Factors:
- Plants tight
- Lack of crop rotation
- Too much moisture.

Species of mildew the most common:
Peronospora parasitica or mildew of crucifers (cabbage, broccoli, cauliflower ...)
Phytophthora infestans: potatoes and tomatoes
Peronospora destructor: onions, garlic
Phytophthora cactorum: strawberry
Phytophthora capsici (mildew of pepper)
Peronospora brassicae (cabbage)
Pseudoperonospora cubensis (downy mildew of Cucurbitaceae)
Bremia lactucae, attacks lettuce and artichokes.
...

Prevention:
- Space the plants: you plant a little less, but we do not lose everything. Air circulates Parmet and the plant to dry.
- Practice crop rotation that interrupts the reproduction of insect pests and fungal diseases.
-Avoid constant moisture on the leaves, planting tomatoes and potatoes in the sun and water at the foot.
- If necessary and if you can protect from rain with plastic stretched over guardians.
- For the tomatoes: bury the nettles at the bottom of the hole, about 20 cm.


Remedies:
-Monitor and the first (and low attacks) immediately remove the affected leaves and try to treat the nettle manure. Otherwise: destroy infested plants, burn. The disease spread rapidly, respond quickly.
- Imperatively: do not replant the same species in the same place before 5 years.
- Although the mildew is very resistant to heat, do not compost infested plants.
- The manure nettle, diluted and garlic décocion prove themselves. (Rather than preventive)
- Fungal treatments: Bordeaux mixture or spray Burgundy. (Controversial character bio)


Treatments Bio

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It is possible to treat naturally mildew using a solution of baking soda, and dish soap. The following mixture is sprayed on infected plants:
-10 Grams (about 1 tablespoon) baking soda
- 4 liters of water
- 40 ml (2 ½ tsp) of horticultural oil or soap
The soap is used to set the baking soda on the sheet, repeat the spray after rain or watering the leaves. The toxicity of the treatment is zero.