What is the treatment of tomato gray leaf spot, and how to treat the black spot disease of tomatoes?

The first consideration for the prevention and control of tomato gray leaf spot is to select disease-resistant varieties. At the same time, the following measures are applied:

First, agricultural prevention and control.

Crop rotation is practiced. rotation with non-Solanaceae crops such as cruciferous and cucurbitaceae; Strengthen field management. When planting, sufficient basal fertilizer was applied, and organic fertilizer, phosphorus and potassium fertilizer were added to enhance the host's disease resistance. If conditions permit, drip irrigation or dark irrigation under the membrane should be implemented as far as possible, and ventilation should be strengthened to reduce microclimate humidity; After harvesting, the diseased residues should be removed in time, burned in a centralized manner, and the soil should be turned deep in combination with land preparation to reduce the source of overwintering bacteria.

Second, chemical control.

At the beginning of the disease, spray 600 times of 75% chlorothalonil wettable powder, or 500 times of 40% closulfidan wettable powder, 400 500 times of 77% copper hydroxide wettable powder, 800 times of 80% mancozeb wettable powder, and 500 times of 50% thiophanate-methyl sulfur suspension, and control once every 10 days, and 2 3 times in a row.

Hello, the prevention and control methods are as follows:

1. Seeds of disease-resistant varieties are used.

2. The greenhouse protection area has just begun to spray in the early stage of the disease, and the special type for vegetable and fruit virus infection should be applied.

3. Eliminate the sick and disabled body immediately after the onset of the disease, and put an end to centralized damage. Use difenoconazole water-dispersed granules and spray once every 7-10 days.

4. Improve cultivation technology, apply phosphorus and potassium fertilizers to Haihai and Weihai to improve disease resistance.

[Symptoms and characteristics of tomato black spot disease]: Tomato black spot disease is also known as nail head spot disease and finger spot disease. It mainly damages fruits, leaves and stems.

The infected lesions of the fruit are grayish-brown or brown, round to oval and slightly concave, with distinct edges. There are one or several lesions on the fruit, which vary in size, and the spots have black mold, i.e., conidia and conidia.

Pathogenesis of tomato black spot disease]: Mycelium or conidia and conidia are overwintered in the soil with the diseased residues, and the conidia spread by airflow in the following spring, and the initial infection and re-infection are carried out. The bacterium is weakly parasitic and has a wide host range, and is usually attacked by this bacterium only when the plant grows weakly or the fruit has wounds.

Warm and humid weather is favorable for the development of the disease.

Tomato black spot control method]:

1) Strengthen water and fertilizer management, so that the plant grows steadily and steadily, which can reduce the damage.

2) Early spraying prevention, spraying 75 chlorothalonil wettable powder 600 times and 58 methalin-manganese zinc wettable powder 500 times from the green fruit stage. 50% dimethane wettable powder 500 times liquid, 80% mancozeb wettable powder 600 times liquid, 50% iprodimida wettable powder 1000 1500 times liquid, 40% grammetrian wettable powder 400 times liquid; Any one of the above agents is mixed with 50% chlorobromoisocyanuric acid soluble powder 1500 times, natural brassinin EC 6000-10000 times, green wind 95 600 times, and Kebao plant eugenics 1500-3000 times (transplanted crops, pesticide damage and fertilizer damage, frost damage, waterlogging damage, strong roots and seedlings, and 1500 times used for controlling prosperity).

Tomato black spot disease is a disease that occurs in tomatoes caused by Alternaria nail-headed tomatoes. Mainly damage the fruit, the fruit surface produces oval or round lesions, slightly concave, brown lesions, often black mold, and the later lesions are often combined with each other for large lesions. [3]

The plant is weakened or the fruit is wounded before it is attacked by the germ; Warm and humid weather is favorable for the occurrence of the disease. [4][6]

Control methods Agricultural control.

Variety selection: choose disease-free and disease-resistant varieties.

Clean the farm: remove the diseased and residual fruits in time after harvesting, take them out of the field to bury or burn, turn the soil deeply, and accelerate the decay and decomposition of the diseased residues. [1][2]

Strengthen cultivation management: deep ditch high furrow, reasonable dense planting, and often dredge the surrounding ditch system, prevent water accumulation after rain and reduce the groundwater level, in the pipe shed and multi-story greenhouse to protect the shed in the scientific fertilization, watering and fertilization to small water and less fertilizer watering frequently, increase the ventilation and humidity of the shed. In the early stage of the disease, the diseased fruit should be removed in time.

Chemical control. Seed disinfection: The introduction of commercial seeds before sowing dried seeds with fludioxonil suspension seed coating agent (when happy) coating, the coating dosage is 3-4, and the coating is dried and sown. [1][2]

Pesticide prevention and control: in the onset period, combined with the prevention and control of the main diseases of tomato, the selection of broad-spectrum fungicides for concurrent treatment, the prevention and control of tomato black spot disease in the appropriate period from the green fruit stage began to spray, the interval between drugs is 7-10 days, and the continuous prevention and control is 2-3 times.

Black spot disease, also known as head spot disease, mainly damages tomato fruits. Pay attention to prevention and control in planting, disinfect seeds before sowing, strengthen fertilizer and water management during growth, and appropriate top dressing to enhance plant disease resistance. If it enters the rainy season, you can spray the bacteriophilic cool suspension for prevention, and spray pesticides such as chlorothalonil wettable powder at the beginning of the disease**.

Strengthen field management to prevent injuries to tomato plants during agricultural operations; Scientifically regulate fertilizer and water to make the plant grow steadily; After harvesting, the fields should be cleaned in time, and the soil should be plowed and sunned.

March 22, 2018 Tomato black spot disease prevention measures 1, tomatoes should be covered with high furrows and mulch, and the density should be appropriate. 2. Strengthen water and fertilizer management, apply enough manure, and be timely.

You can buy Bordeaux liquid or carbendazim according to the proportion of water spraying, generally speaking, spraying for a week can see the effect, if it rains, you have to spray again.

Before the disease occurs, it can be prevented by spraying fungicide spray. After tomatoes have leaf spot disease, they can be treated with carbendazim, fungicide spray, and chlorothalonil**, which can have a good effect. If the humidity in the greenhouse is large, you can use some chlorothalonil smoke agent to smoke inside, which can also play a preventive role.

Tomato farming tips.

1. Temperature: The temperature is best kept between 15 degrees and 28 degrees, if possible, the temperature at night can be controlled between 15-20 degrees, and the temperature during the day can be controlled between 25-28, so that the color of the tomatoes will be more vivid and the taste will be better.

2. Watering: It needs a lot of water to grow, but there can be no water in the soil, so it is best to choose the soil with better drainage effect for planting, and generally need to be watered in the morning and evening, especially in the growth period.

First, the tomato gray leaf spot disease**:

difenoconazole water dispersible granules 1500 times liquid + 70% methyl tobuzine wettable powder 600 times liquid mixed spray; 25% azoxystrobin suspension 1500-2000 times liquid spray.

2. The above agents are sprayed once every 7-l0 days, and can be shortened to 1 time in 3-4 days when the condition is serious, and a total of 2-3 sprays. When spraying, pay attention to the front and back of the leaves. Prune and wipe the buds in time to ensure ventilation in the field.

For the diseased plants, remove the diseased residues in time, and pull the harvested residues to the field for centralized burning.

3. The medication interval is determined according to the weather, if it is rainy, spray the medicine once every 5-7 days. Especially on rainy days for 4-5 consecutive days, spraying should be done immediately after the rain stops.

2. Prevention of tomato gray leaf spot disease: 75% chlorothalonil wettable powder (or 50% carbendazim wettable powder) 800 times + 70% mancozeb wettable powder 600 times mixed spray before susceptibility, or 1000 times of copper hydroxide dry granules, or 500 times of 20% thiamium copper suspension can be sprayed for prevention.

3. Symptoms of tomato gray leaf spot disease.

1. The disease can appear on both young and old leaves. At the beginning of the disease, the leaf surface is covered with round or irregularly shaped small spots, the lesions are light brown and dark brown around, and the back of the leaf is darker than the front of the leaf, and the surrounding area is dark brown. The lesions are slightly concave, mostly small, and there are also large round brown lesions, which expand over time and are irregularly shaped by the restriction of leaf veins.

2. The lesion is thin, and it is easy to rupture and perforate in the later stage. The leaf margin can also be diseased, with irregularly shaped lesions along the leaf margin, and the color of the front and back of the leaf is almost the same. The lesions often develop along the leaf margins, forming sheets, dark brown, and gradually fade to gray-white to grayish-brown as the leaves dry out.

3. When the damage is serious, it will cause all the leaves to turn yellow. The infested leaves gradually turn brown and soon die and fall off the plant. Gray leaf spot symptoms are generally confined to leaves, but can also occur in stems and petioles when environmental conditions are suitable.

Tomato gray leaf spot disease.

Classification: Disease.

Affiliation: Tomato.

Symptoms: Mainly harm the leaves, rarely the stems, not the fruits. At the beginning of the disease, the leaf surface is covered with small dark brown spots that are round or not round, which are water-soaked and expand along the leaf veins, developing into irregularly shaped lesions. Lesions.

Onset symptoms. The main infiltration mass should harm the leaves, rarely the stems, and not the fruits. At the beginning of the disease, the leaf surface is covered with small dark brown spots that are round or not round, which are water-soaked and expand along the leaf veins, developing into irregularly shaped lesions.

The middle of the lesion fades to grayish-white to grayish-brown. The lesions are slightly depressed, small and numerous, 2-4 mm in diameter, extremely thin, and easy to rupture, perforate or fall off in the later stage. The lesions on the stem are small dark brown spots.

Pathogenesis. The disease is a fungal disease, the pathogen is stempyliumsolani, and the state is called pieospolycopersiri. Pathogens can overwinter in soil on diseased residues or seeds.

When the temperature and humidity are suitable, the primary infection is carried out, and the pathogen spreads through wind and rain and is re-infected. Warm, humid, rainy days, and prolonged condensation are important conditions for the onset of the disease. When the soil fertility is low and the plant growth is weak, the disease is severe.

It can occur at both seedling and adult stages.

Disease ** method.

Cultivation measures. Choose disease-resistant varieties. Increase the application of organic fertilizer and phosphorus and potassium fertilizer. After harvesting, the sick and residual bodies should be removed in time and burned in a centralized manner.

Pharmacy anti-calling. In the early stage of shed cultivation, spray 5 Garinon dust agent, or 7 antimycolin dust agent, or 5 milcofen dust agent, with a dosage of 1 kg per 667 square meters each time; It can also be fumigated with 200 grams of 15% Chloryl tobacco mold agent (Chlorothalonil) per 667 square meters. In the early stage of open field cultivation, the commonly used pesticides are 75 chlorothalonil wettable powder 600 times liquid, 40 grams of bacterial powder wettable powder 500 times liquid, 77 can kill wettable powder 400-500 times liquid, 50 mixed sulfur suspension 500 times liquid.

1 time every 10 days or so, 2 3 times of continuous cluster chain orange control.

Summary. Pro, it can also be used: 20% thiophanate-500 times liquid, or 77% can kill 400 500 times of wettable powder, or milligrams of basic copper sulfate suspension, or 23 grams of hydrogen-copper frosturea wettable powder grams, or 20 grams of thiamium copper suspension 250 500 hectares for control.

Spray 1 time every 10 days, 1 2 times in a row.

Hello dear! Tomato leaf spot disease can choose Chunlei King copper, Kinder, etc., with allicin, chitosan and other sprays.

Gray leaf spot. Yes pro, it can be used.

I've used it, and I can't control it.

Pro, chitosan and other sprays.

Pro, the concentration can be appropriately increased.

Pro, you can use carbendazim, chlorothalonil, mancozeb, etc.

Pro, it is advisable to use smoke and other smoke prevention agents such as chlorothalonil smoke control. When spraying, pay attention to the front and back of the leaves.

Pro, it can also be used: 20% thiophanate-500 times liquid, or 77% can kill 400 500 times of wettable powder, or basic copper thioltarinate suspension milligram kilograms, or 23 grams of hydrocopper-frosturea wettable powder grams, or 20 grams of thiobactyl copper suspension 250 500 grams of hectares of peidanzi for control. Spray 1 time every 10 days, 1 2 times in a row.

Before or at the beginning of the disease, spray the plants with 500 times of 20% thiamyl copper suspension or 1000 times of copper hydroxide powder. Taking 1500 times of 25% amicida suspension for prophylaxis will have a very good effect. In the event of disease, it can be used 10% Shigao (benzoconazole) 1500 times, or 64% alum 400 times, 52% fast inhibiting water purification agent 1800 times or 68% easy water retention agent 1300 times, 47% Garinone wettable powder 700 times, 75 Dakonin wettable powder 600 times, or 10th century high water dispersible granules 1500 times, or 80 Dasheng wettable powder 600 times, or 70 Pinrun dry suspension 600 times, or 25% Kairun emulsifiable concentrate 1500 times liquid, or 6% Lebigon wettable powder 1500 times liquid spraying.

Spray 1 time every 7 10 days, 2 3 times in a row. When spraying, try to use small aperture spray pieces to reduce the humidity of the leaf surface. The topped plot is sprayed with 30% phenylether methyl propylene emulsifiable concentrate 3000 times and 50% sulfur suspension 1000 times mixed with spray, which has a good control effect.

However, phenylethermethyl propionate emulsifiable concentrate inhibits the growth of tomato and is used as a companion, so it is used less or no in the vigorous growth plots. At the beginning of the disease, the shed protection area began to spray 5% Garinon dust agent or 7% milfin dust and 5% mypin dust agent, with 1 kg per mu. You can also choose 15% cloxin tobacco mold agent (Suke Lu Zhu Hongling chlorothalonil), 200 grams per mu of fumigation.