blight - threatening fungal disease affecting mainly Solanaceae (potato, tomato, eggplant, peppers, etc.).It calls it the fungus Phytophthora infestans, which is entered to the site often to the purchase tubers or seedlings.Sources of infection can also be left for the winter pile tops.The spores of Phytophthora, wintered, cause disease of new plants.To deal with this infection is very difficult.Simply to prevent its development.
Phytophthora, control methods which are primarily in the prevention, infects plants mainly in the second half of the summer.Therefore, it is important not to miss the timing of planting potatoes.The most optimal time - the second decade of April.Before planting, the soil must be loosened.Many vacationers during the laying of tubers into the wells to throw handfuls of manure.In this case, it is important to observe the dosage.The fact that an overabundance of nitrogen in the soil - one of the main causes of Phytophthora.So do not get too much manure to fertilize the soil.
Some surplus of potash and phosphate fertilizers on the contrary reduces the risk of diseases such as late blight.Methods of dealing with it are quite complex and often ineffective.Therefore, another excellent way to prevent its development can be considered the use of the area is only stable for her grades.It may be "tempo", "Gatchinsky" "Table 19" and others.
Phytophthora on potato often manifests itself in the event that it is grown on for several years in the same place.In this case, gradually accumulating, infection greatly reduces the yield.One should not be planted near the potato field tomatoes.In the latter case may suffer both cultures.The roots before planting necessarily sorted, culling all the small, ugly and sick.It is best to sustain them another week at a temperature of 16-18 c.Celsius.During this period, spot blight become visible, so remove diseased tubers will be easy.
Phytophthora potatoes often affects it in a cool rainy summers.In this case you should reduce the amount of irrigation.It is very important time to remove the weeds, weakening the plant and conduct hilling.A thick layer of soil over the tubers will not penetrate them fungal spores from the leaves and branches.
If, however, late blight has touched your crops, you have a great and laborious work.First, you need to remove all infected leaves and stems.Then the potatoes treated with drugs fungicides.Also it copes with the disease Bordeaux mixture.However, it is best to use new media.The fact is that late blight, control methods which involve the use of copper-containing drugs, rapidly mutates and adapts to all applicable thereto chemicals.
In some cases, it is useful and environmentally friendly means of microbiological new generation.Their operating principle is simple: their constituent in contact with the bacteria in the water activated, and the substrate solution on the branches and stems start to destroy the fungus.Rainwater they penetrate into the soil, facilitating the purification of the disease and tubers.Thus, it is possible to cope with the disease "late blight".Methods of dealing with it chemicals, of course, can be regarded as more radical.However, the use of microbiological agents will provide uncontaminated harmful compounds harvest.In this case, the decision rests with the owners of the site.