Potato blight on tomatoesis a very dangerous disease of these plants, causing large losses in tomato cultivation both in the field and under cover, commonly found in our country. See how to recognizesymptoms of potato blight on tomatoes , how to prevent this disease, as well as recommended sprays and other methods forfighting potato blight on tomatoesHow to grow plague-free tomatoes?
Potato blight on tomatoes
Fig. depositphotos.com
Potato blight on tomatoes - symptoms
Potato blight on tomatoesis caused by the fungus organism Phytophthora infestans. It is found in potatoes, tomatoes and other nightshade vegetables. In tomatoes, it infects all above-ground organs of the plant, including fruit.
Symptoms of potato blight on tomatoesgrown in the ground are usually observed at the end of June, when the pathogen massively attacks early varieties of potatoes . In tunnels and greenhouses, plague symptoms often appear in April.
Potato blight on tomato fruits
Fig. Scot Nelson, CC0, Wikimedia Commons
Stains on tomato leaves are also observed as a result of theblight of tomatoes . They are watery, gray-green spots that gradually turn brown. Within these spots, the leaf innervation is brown-black.With high air humidity, a white, delicate coating of the pathogen's sporulating mycelium may appear at the spots on the underside of the leaves.
Potato blight on tomato leaves
Fig. Scot Nelson, CC0, Wikimedia Commons
Also brown, hard spots appear on the stems and fruit buds. The course of the disease can be very rapid, especially when grown under cover, leading to complete wilting of all tomatoes within a few days.
Potato blight on tomato stalks
Fig. Scot Nelson, CC0, Wikimedia Commons
Potato blight on tomatoes - combating
Effectivecombating potato blight on tomatoesrequires, first of all, taking preventive measures and avoiding conditions conducive to the development of this disease in tomatoes.
First of all, do not locate tomato cultivation in hollows and in the vicinity of water reservoirs, because moisture and accumulating fog favorinfection of tomatoes with potato blightIn the case of growing tomatoes under covers, it is extremely important to ventilate greenhouses and garden tunnels so that the air inside them is not excessively humid. Also, do not sprinkle the leaves on the tomatoes, always water them directly onto the soil.
The cultivation of tomatoes should be abandoned if there are potato crops nearby, as the pathogen usually first attacks the potatoes and then spreads to the tomatoes. When planting tomatoes next to potatoescontamination with potato blightwe are almost guaranteed … In the fight against potato blight on tomatoes, one should also remember to rotate, i.e. avoid planting tomatoes in the same places in subsequent years. When plants show symptoms of disease, it is necessary to remove infected plants and start spraying.
Potato blight on tomatoes - home remedies
Due to the rapid development of the disease and the extensive damage it causes,potato blight sprayingis done preventively before its symptoms appear on tomatoes. The signal for mandatory preventive spraying is the appearance ofsymptoms of potato blighton nearby potato crops.
First of all, before we reach for chemical plant protection products, it is worth using natural andhome remedies for potato blight . They are spraying with preparations prepared on the basis of weeds, herbs and baker's yeast.
For preventive sprayingagainst potato blight on tomatoesuse horsetail manure. It is prepared by pouring 5 liters of water over 500g of green leaves (or 100g of dried) horsetail and wait until fermentation is complete. We use diluted with water in a ratio of 1: 5.Horsetail manure contains a lot of silicic acid, which prevents the formation of fungal diseases such as powdery mildew or potato blight, and also repels pests, such as aphids.
As a preventive measure againstpotato blight on tomatoeswe can also use nettle decoction. Prepare the stock from 0.5 kg of fresh plants and 5L of water. Boil the nettle with water for about 0.5 hours. After cooling down, dilute the finished preparation with water in a ratio of 1: 5, water it and spray the endangered tomato bushes. Most often, this decoction is used in early spring. By the way, the nettle herb is also worth preparing a slurry, which is an excellent fertilizer for tomatoes.And if there are no nettles growing in our area, you can buy ready-made SUBSTRAL or TARGET nettle spraying in the garden shop.
Another often recommendedhome remedy for potato blightis spraying tomatoes with yeast.To prepare it, you take a cube of baker's yeast (100g) and dissolve it in 10 liters of water. Some people add half a liter of milk to it. Plants should be sprayed at intervals of 7 days.Another recommended home method is spraying tomatoes with milk. For this, the milk should be diluted with water in a ratio of 1: 5 and the plants should be sprayed regularly every week.
It should be remembered, however, that the effectiveness of suchnatural sprays against potato blight on tomatoesis low, although many organic gardeners praise them very much. They work well as long as they are done preventively before the disease attacks.
Potato blight on tomatoes - spraying
In chemical protection, the following fungicides are used forspraying of late blight on tomatoes
Acrobat MZ 69 WG- tomatoes can be sprayed both in the ground and under cover. Dosage for field cultivation is 25 g of the agent dissolved in 7-8 liters of water, it is enough for 100 m² of cultivation.In cultivation under covers, use a concentration of 0.3%, i.e. 30 g of the agent is dissolved in 10 liters of water.
Amistar 250 SC- used in the field cultivation of tomatoes at a dose of 8-10 ml of the agent dissolved in 8 liters of water per 100m². Spraying also combats alternaria. Order in our store: Amistar 250 SC
Amistar Opti 480 SC- a twin preparation for the cultivation of tomatoes under cover. Dissolve 25 ml of the agent in 10 liters of water, which is enough for 100m². This agent can be sprayed up to two times a season, 14 days apart.
Miedzian 50 WP- is the basic agent selected for use in amateur crops in home gardens and allotments, approved for organic farming. Miedzian fights many bacterial and fungal diseases on a variety of crops, including bacterial mottling and potato blight on tomatoes.
In the case of potato blight, Miedzian must be applied as a preventivebefore disease symptoms appear as signaled or during periods of expected disease risk.When growing tomatoes in the soil of Miedzian 50 WP, we dose 25-30g of the agent dissolved in 7 liters of water, which allows spraying 100m² of tomato beds. Under the covers, 30 g of copper is dosed for 10 liters of water. You can spray 2-3 sprays a season every 7-10 days, preferably alternating with fungicides from other groups.
Polyram 70 WG- use only in soil tomato crops in a dose of 12-18 g dissolved in 6-7 liters of water. Spray this amount on 100m² of the crop. It also fights alternaria. You can use up to 3 times a season, repeating spraying every 7-10 days, alternating with fungicides from other groups.
Revus 250 SC- used against potato blight on tomatoes and against blight in field cultivation. The dose is 6 ml to 4 liters of water, enough to spray 100m² of the crop. The first spray of Revus 250 SC is performed as a preventive measure in the event of a disease threatening or after the first symptoms of disease appear in the period from April to October.A maximum of 3 sprays per season can be performed at intervals of 7-10 days. Use alternately with other fungicides.
Ridomil Gold MZ Pepite 67.8 WG- used against potato blight on tomatoes and alternaria in field cultivation. The dose is 22.5 g dissolved in 6-8 liters of water, it is enough to spray 100m² of the crop. The first spraying with Ridomil is carried out as a precautionary measure in the 5th phase of the true leaf. A maximum of 3 sprays per season can be performed at intervals of 7-10 days. Use alternately with other fungicides.
Signum 33 WG- spray preventively (especially in field crops, when the first symptoms of late blight appear on early potato varieties growing in the area) or when the first symptoms of the disease appear. Another Signum 33 WG spraying is performed every 7-10 days, up to 3 times a season. We use 2g of the agent per liter of water.
These are, of course, not all pesticides that can be used againstpotato blight on tomatoes , their list is slightly larger.However, I was able to find the above-mentioned in small packages adapted to the needs of amateur cultivation on plots. Regardless of the measures chosen, remember about the general rules - start spraying preventively even before the first symptoms of the disease appear, as indicated, repeat them every 7-10, alternate different agents (at least two) and remember that most of these preparations must not be used more like 2-3 times a season.
Listed in the articlemeans of protection against potato blightyou can order in our store. We guarantee high-quality products, efficient service and shipment within 24 hours. (which is important when your plants are already sick andyou need to spray quickly ). To go to the store, press the button below: -)
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