Late blight occurs on the green parts of plants: stems, leaves, peduncles, and also affects the tubers. The disease affects the potatoes more intensively with high humidity and moderately warm weather. Of course, growers want to get rid of the disease in a short time and protect planting in the future.
. ContentsFolk remedies
- Trihopol
- Wood ash
- Milk with iodine
- Garlic infusion with
- wheyand chemical means of protecting potatoes and folk .Consider what are the main methods of control and prevention of the occurrence of phytophthora.
The manifestation of late blight on potatoes Preparations and processing time before planting
In the ground there may be vegetation contaminated with fungal spores. In order not to spread the infection, in the spring, before planting, the soil is watered with Bordeaux mixture or copper sulphate solution( 1-3%), then the earth is dug up.
To combat late blight on potatoes, tubers are sprayed before planting with Prestige, for this purpose, 60 ml of the drug is dissolved in 0.6 l of water. This composition is enough to handle 60 kg of tubers.The composition is prepared on the day of planting, and mixed before spraying. Put the solution in a sprayer and spray the sprouted potatoes, wait 1-2 hours, after planting the tubers. It is advised to deliver tubers to the landing site in closed packages.
You can treat instead with Maxim .
Copper sulfate 
Preparation Maxim What to process - seeds or tubers
Usually, when planting, it is the tubers( and not the seed for planting) that are sprayed with the drug from late blight.
How to protect potatoes from late blight after planting
To protect the crop from disease, apply compounds with copper, for example, Bordeaux mixture of 1% ( it is prepared by pouring 100 g of copper vitriol, 100 g of lime into a ten-liter bucket of water).
Interval between spraying 7-10 days. Last sprayed 21 days before harvest.
At the same time as spraying the Bordeaux mixture, no other fungicides can be used.
Bordeaux Mix Potato Prevention Products for Phytophthora
Phytophlorosis resistant potato varieties: Arina, Spring, Blue, Mavka, Nevsky, Spark, September.Then:
- Isolate healthy bushes from diseased, including garbage collection, weeding, this will delay the appearance of the disease on the stems and leaves until the budding time.
- For planting, pick only healthy potatoes.
- Use fungicides to seed tubers.
- Observe the crop rotation : plant potatoes for a year, after 2 years lupine, beans, beans, and then potatoes again.
- If you pile up the bushes high, it will partially protect them from secondary infection.
- Sanitary measures - we do not allow stagnant moisture;Do not water the potatoes by sprinkling in the evening, as otherwise dew will appear in the morning;timely weed out the weeds.
- Avoid excess nitrogen.
- Cut the tops a week before harvesting , if you plan to use potatoes, and 10 days if you plan to plant the tubers in the future.
- Harvest when there is no rain, after drying potatoes for 5 hours. Dig the aisles 5 days before harvest. This makes picking potatoes easier and removes weeds.
Fungicides for potatoes
Contact fungicides
Must remain on the plants when the pathogen comes into contact with them, it will die.
Table 1 .Contact fungicides against late blight and fungicide application rate
Norm kg / ha pennkotseb 1.1-1.6 bravo 2-2.3 novozir 1.6 Kuprikol, copper oxychloride 2.4-3.2 kuprosat 5.0 utan 1.2-1.6 shirlana theThis is an acrobat, kurzat. Systemic
The principle of operation of the systemic fungicides: they pass inside the stems and leaves, spread, inhibit the development of a pathogenic microorganism, as they directly affect it or as a result of metabolism. So the drug helps from phytophthora.Even after 2-6 hours from the time of treatment, the rains will not reduce the effect of their action. And they take 2-3 weeks off the pathogen. But pathogens produce resistance to them.
Therefore, it is advised that apply them 2 times per season of .And if you still need spraying, you can use contact drugs or systemic fungicide with a completely different composition.
System-contact
Table 2 .System-contact fungicides and their dilution rate
Fungicide Norm Thanos 0.6 l / ha Acrobat Mc 50gr.per 10 liters of water Tattu 100ml.10 liters of water Ridomil Gold Not more than 2.5 kg / ha 50g.per 10 liters of water
Spray the bushes every 2 weeks. Wood ash
When the potatoes rise, sprinkle ashes between the rows. When the potatoes bloom, then repeat.
Milk with iodine
Pour 1 liter of skimmed milk into a ten-liter bucket of water, drip 15 drops of iodine. With , spray the bushes every 14 days with .
Trichopolus 
Wood Ash 
Milk with Iodine Self-Controlling Means
Infusion of Garlic with Manganese
Recipe for Infusion of Garlic Garlic: 100 g of Garlic( take the garlic head, take out the head of garlic with the help of garlic garlic: 100 g of garlic( take the head of garlic with garlic, 100 g of garlic( take the head of garlic with the garlic, 100 g of garlic( take the head of garlic with garlic, 100 g of garlic( take the head of garlic, 100 g of garlic( take the head of garlic, 100 g)In a glass of water, place the garlic and leave for a day. After strain and pour into a ten-liter bucket with water, add 1 g of potassium permanganate to the same place.Spray the bushes every 2 weeks with a solution. Pour half a liter on the bush.
Whey Whey Add the same amount of water to whey from yoghurt and spray bushes every 2–3 days.
Three-fold treatment of planting
This means that the planting process 3 times :
- From germination to closing the foliage in a row use - Shirlan, Tattu .
- From the closure of the tops to the budding use - Ridomil Gold, Infinito .
- From the appearance of flowers to the topping of the tops of the tops - Acrobat Mc .
Phytophlorosis disease
What is potato phytophthora
Phytophthora of potato is a dangerous disease resulting from the spread of the fungus, it develops very quickly, and as a result, yields are greatly reduced.
Signs of late blight
The most obvious sign of late blight: brownish specks are visible on the leaves and stems of the culture, after some time a fluffy gray-whitish bloom appears on the spots. With further spread the plant may die.With precipitation, spores from the leaves fall to the ground, further to the tuber crops, , a secondary lesion occurs with .
Phytophthora on the leaves of potato Phytophthora on tubers, primary lesion: small gray specks are visible, they grow and merge into darkish areas of flesh, the peel becomes reddish-brown.
Secondary lesion of tuber crops: they rot, decompose, have an unpleasant odor, then become soft. The disease can affect the very center of the tubers and in winter, when the fungus begins to multiply, it becomes visible.
What is the causative agent of late blight
? The causative agent - pathogen oometsit Phytophthora infestans. It is assumed that he is originally from Mexico .
There are 2 strains of the disease: A1, it does not form a spore that can survive the winter;A2 has spores that are resistant to frost. When oomecytes are crossed, new strains appear that are resistant to frost and fungicides.
Late blight and blight - is there any difference
The disease itself comes from blight blight mushrooms - blight. It can be in tomatoes, peppers, potatoes, eggplants, buckwheat, strawberries .
tomato late blight Phytophthora 
Peppers with Eggplant, struck late blight Why fight phytophthora blight
spoils every year 10 - 15% of the harvested tubers, during epitaphs - to 70%.
If you do not fight blight, for 2 weeks without the use of chemicals 2 - 3 plants can infect the land of 1.5 hectares. Landing will die.The smallest temperature at which the disease is observed - 1.3 ° C, the highest - + 30 ° C.The incubation period lasts depending on the air temperature 3 - 16 days.
Spores of the fungus multiply more intensively at a temperature of + 10 ° C and an ambient humidity of 75%.Spores of the fungus are transferred by wind and rain from one plant to another. The wind carries disputes for 2-3 km from the originally affected plant, it is proved.
And remember that it is better to carry out preventive measures so that the plants do not get sick with late blight than to eliminate the disease and eliminate the consequences!
