powdery mildew,

Introduction:

The powdery mildew, is the common given the asexual form of certain fungi belonging to the family of érysiphacées. Powdery mildew is a fungal disease. It is also known as "white mildew", caused by different species of fungi. These fungi are responsible for terrible diseases that infect more or less specific, various species of cultivated plants. Each mushroom his favorite plant, there are over 100 species. Thus the rose powdery mildew on your squash will not, and vice versa. Powdery mildew attacks the vine, to the roses, to the fruit trees, to the gooseberries and to the vegetables...





Symptoms :
The leaves are covered with white mycelium on both sides, a sort of white powder. The leaf curls, is drying up. Lacking the ability to synthesize chlorophyll the plant vegetate. Powdery mildew can cause distortion of leaves, which curl and swell. The fungus multiplies preferentially on young bodies (leaves), it invaded and deformed.

Risk Factors :
The hot and humid summers. 

Species of powdery mildew the most common:
Erysiphe graminis : oïdium des céréales
Sphaerotheca pannosa : oïdium des rosiers
Erysiphe cichoracearum : oïdium des concombres et des courgettes
Podosphaera aphanis : oïdium du fraisier
...


Prevention: 
- Adequate spacing of plants.
- Regular cleanings around plantations (clear the center of Roses does not help maintain moisture).
- Fast Removal of the parties or affected individuals to avoid or slow the spread.
- Do not water the foliage during hot weather.
- Preventive treatment in susceptible individuals.

Sulphur Treatment (Bio)

Sulphur, commodity, used for a very long against powdery mildew, always gives good results in Controls (late autumn and early spring) or semi-healing. It is allowed in organic farming and can be used very close to harvest because it is completely biodegradable. Its shares are also interesting side on a number of other fungi and insects or mites. Sulphur bought as a "wet powder" which is diluted in water so the doses given on the package, and the increase does not improve treatment efficacy. But this "sulfur water" is much less effective than sulfur powder.

Remedies:

Milk Processing(Bio)
A regular spray foliage with a mixture of water and milk (10 1) can eradicate powdery mildew. Furthermore, this vaporization strengthen the immune system of the plant. Preferably use a skimmed milk or semi-skimmed milk to avoid the odors of decomposition of the milk fat. Do not overdose milk if other types of fungi develop. The action of milk on powdery mildew can be explained by its anti-fungal natural.

Treatment with bicarbonate of soda  (Bio)
The spray of baking soda is quite effective. Its basic pH prevents fungal spores from germinating. Dissolve 5 g (1 teaspoon) of baking soda per liter of water and add 1 teaspoon liquid soap or milk so that the solution clings to the leaves.
Spray this solution on and under leaves and repeat after any heavy rain.

Treatment with bleach (Bio)

By spraying in early winter to prevent. 25 ml of bleach to two quarts of water, even dilution curative but avoid the sun. The result is successful even with a heavy infection. Advantages: cost, environmental impact limited (chlorine evaporates fairly quickly), no stains. It is a radical means of care for roses susceptible to this fungus. Disadvantages: it kills the wildlife and flora of the soil, reducing fertility in the medium term.

Treatment with Bordeaux mixture
Bordeaux mixture, a potent fungicide can also be used.


Other treatment Bio
-The use of manure horsetail, containing silica, or an infusion of garlic mixture in (sulfur compounds in garlic, the milk used for adjuvant antifungal grip and also see below) , will eliminate mildew, while preserving the environment and soil fertility. For use at the onset of symptoms.
The decoction of roots-Nettle or sorrel has a dramatic effect: Soak in a quart of water, 100 g of roots for 24 hours. Simmer 30 minutes and use pure.