Late blight on potato — measures
In the potato late blight affects both the leaves and stems, and tubers.
In wet warm weather during budding on the leaves at the bottom of the Bush are viewing brown oil spots.
White patches on the underside of the leaves resembles fur and is the same fungus that causes the disease.
Conidia are spread quickly across the landing in rainy weather, the spotting on the leaves increases and plants become sick.
Begins to show late blight of potato on leaves, petioles, stems brown stripes and spots. During rain the spores of the fungus fall to the ground and settle on the tubers.
Especially the fast spread of Phytophthora in the tuber begins during the harvest. When we dig Bush potatoes and shake it to shake the ground, the spores scatter throughout the site and, in addition, affect other tubers.
Affected tubers are easily identified by appearance: they are formed inside the slightly depressed brown spots, which penetrate in the form of stripes and streaks.
Such potatoes cannot be kept long, as it quickly rots.
Methods of dealing with late blight
First of all, you need to always keep clean the garden area and promptly remove the affected spores of the fungus collected plants.
To touch the potatoes regularly and to carry waste beyond it, and not to leave with the pile.
After the landing before the closing of the tops, the potatoes need to till and weed, removing not only the weeds but also diseased plants.
A half weeks before harvesting potatoes, the tops should be removed, and the tubers before laying on storage well ventilated and dry.
When storing the tubers the temperature in the store must be within ten degrees. In this temperature regime, the tubers are well preserved in the absence of moisture.
To prevent mildew, the potato also should be sprayed at least four times over the holiday season, constantly changing the composition of the liquid.
First spray with copper sulfate or Bordeaux produced in the period of budding plants.
This procedure can be done with polyhema. It is better to treat the leaves with copper oxychloride.
Finally it is possible to apply spraying polycarbacine. Usually spend during spraying about one five-gallon bucket of prepared solution per one hundred square meters of cultivated area.
The number of treatments depends on the weather and the varieties of potatoes, but one condition you must adhere necessarily: the last spraying should be done at least three weeks prior to harvest.