Late blight on tomatoes and methods to combat it
Phytophthora is a fungal plant disease that affects mainly tomatoes and potatoes.
It affects the leaves, stem and fruit.
Late blight on tomatoes
Usually in late summer on the leaves of tomatoes and their fruits appear brown spots.
On the reverse side of the sheet may be white patches.
Stained leaves quickly dry up and die. On leaf petioles the spots are elongated shape and subsequently grow strongly, completely covering the plant along with the fruit.
Especially Phytophthora is favored by warm rainy weather with sudden changes in day and night temperatures, which are characteristic of Aug.
Bad for plants and create favorable conditions for Phytophthora night and morning fog, which fall to the ground from the end of July on a fairly regular basis.
But August is for the most part of territory of Russia the month of ripening fruit, so it’s important to carry out preventive and therapeutic measures to combat late blight to your crops please you fully.
The main interventions for the prevention of this disease deep autumn plowing and digging a garden plot.
Affected fruits and plant remains should be removed and disposed of outside the site.
The plot planted with potatoes must be at a considerable distance from the raised beds with tomatoes is a very important condition to prevent the spread of Phytophthora.
It is undesirable neighborhood with cucumber patches because the environment that you create for good growth and yield of cucumber (frequent watering in warm weather) is a favorable condition for the development of late blight in tomatoes and potatoes.
In the autumn the soil before or after plowing should be made more potash fertilizers.
Tomatoes are advised to begin spraying from the seedling period, changing the composition of the sprayer during the period of growth and fruiting of tomatoes.
You can start with Bordeaux mixture, then the second spraying is carried out with copper oxychloride, and the third time to spray polycarbacine.
The fluid flow for processing should be applied in the ratio of one liter per ten square meters.
If you see that the summer is pretty rainy, it is desirable to carry out the treatment, changing drugs to 5 times per season and if weather in summer is dry, it will be enough 2-3 times.
If late blight has covered a large number of plants, and the fruits are not yet ripe, it is better to collect them brown and put to Mature in the room.
But periodically, at least once in 2 days fruits are advised to inspect and to remove those which appeared first spots. To prevent further destruction of the crop by this fungus.