Tomato bacterial horn spot is a common disease, how to prevent and control tomato bacterial horn spo

Tomato bacterial spotted disease, also known as bacterial microspot disease, is the pathogenic type of tomato leaf spot disease of Pseudomonas clove. The pathogen overwinters on seeds, diseased residues and soil, spreads through agricultural operations such as rainwater, irrigation water and pruning and pruning, and has many re-tomato leaf damage, water-stained small spots at the beginning, and then expands into irregular spots, dark brown to black, no wheel lines, when the humidity is high, shiny bacterial pus can be seen in the later stage of the lesions.

Tomato leaf spot disease only damages the leaves, and the leaves are covered with dark round or irregular round spots at the beginning of the disease, and then expand along the leaf veins to the surrounding areas, and will rupture, perforate or even fall off in the later stage. 10% difenoconazole water dispersible granules can be used 1500 times + 70% methyl watermelon virus disease is mainly caused by cucumber mosaic virus. Viruses carry poisonous aphids.

Overwintering on the body, seed epidermis and some weeds with roots becomes the source of infection at the beginning of the following year. Aphids and melon leaf worms are the vectors of transmission, and contact transmission through agricultural activities is an important way of spread.

**Browning or grayish-white perforation and rupture, milky white bacterial discharge occurs in the diseased area when the humidity is high. The stems and fruits are infected, and at first they appear water-soaked lesions, and then they also overflow with white pus, which turn gray when they are dry, and form ulcers on a daily basis.

or a rip. Seed treatment. with 10% trisodium phosphate.

Soak the seeds in the liquid for 20 minutes, or treat the seeds with 70 degrees Celsius for 72 hours to kill the virus carried by the seeds. Strengthen field management. Remove weeds and diseased plants to reduce the source of poison. When pruning and pressing the vines, the healthy plants should be healthy first and then the diseased plants to prevent contact transmission.

Watermelon bacterial brown spot disease.

It is also called watermelon bacterial spot disease, which mainly harms leaves. At the beginning, yellow or yellow-brown small horn spots are formed on the leaves, the size is 1 2 mm, and the leaves turn brown and die when they are severe, and sometimes they harm the leaf edge to cause necrosis, and the symptoms of watermelon horn spot disease: mainly occur on leaves, petioles, stems, tendrils and fruits.

Cotyledons are diseased with round or irregular yellow-brown lesions; The lesions on the leaves begin to be water-stained and then expand to form yellow-brown, polygonal lesions, sometimes on the back of the leaves.

1. Select resistant varieties. 2. Pay attention to crop rotation and stubble. 3. Strengthen management and regulation of environmental conditions.

Timely control of the plant to prevent the growth of the plant, and appropriate spraying of foliar fertilizer to improve the disease resistance of the plant. 4. Pharmaceutical prevention and control, in the early stage of the disease, you can choose 500 times of 20% thiobacille copper suspension or 1000 times or 20 leaf dry azole for spraying and control.

Fertilizers should be used to prevent pests and diseases, and pig manure should also be used so that tomatoes can be well absorbed, and they should be watered frequently so that this problem can be controlled.

Tomato bacterial diseases can be prevented and controlled by 2% Chunleimycin or 10% Zhongshengmycin or 20% Yehurazole or 47% Chunleiwang copper spray, but strictly speaking, tomato does not have bacterial horn spot, bacterial leaf spots, macules and other diseases.

Timely spraying of pesticides, but also timely watering and fertilization, so that tomatoes have a very healthy state, can effectively avoid the occurrence of bacterial horn spot disease.

Pesticides should be sprayed in a timely manner, and the right medicine should be prescribed for the problem, and the growth of tomatoes should also be watered in a timely manner, and the growth of tomatoes should also be observed in a timely manner.

<> tomato fungal diseases include early blight, late blight, gray mold, leaf mold, wilt, etc. Early blight: 80% azoxystrobin water dispersible granules and other drugs can be used to prevent and control.

Late blight: It can be controlled with drugs such as 10% difenoconazole water dispersible granules. Botrytis cinerea:

It can be prevented and treated with drugs such as 90% carbendazim water dispersible granules. Leaf mold disease: It can be prevented and treated with drugs such as "Lanling King".

Fusarium wilt: Root irrigation can be carried out with drugs such as 50% enoylmorpholine.

1. What are the fungal diseases of tomatoes?

Early blight, late blight, gray mold, leaf mold, blight.

2. How to prevent and control the disease of tomato fungus

1. Early blight: Generally, 10% difenoconazole water dispersible granules (800-1000 times liquid) or 80% azoxystrobin water-dispersible granules (3000-4500 times liquid) can be sprayed.

2. Late blight: Generally, 10% difenoconazole water dispersible granules (800-1000 times liquid) or 45% tebuzoazoxystrobin water dispersible granules (1000-1500 times liquid) and other drugs can be sprayed.

3. Botrytis cinerea: Generally, 90% carbendazim water dispersible granules (500-600 times liquid) or 10% difenoconazole water dispersible granules (800-1000 times liquid) and other drugs can be sprayed.

4. Leaf mold: Generally, 45% tebuazolestrobin water dispersible granules (1000-1500 times liquid) or Lanling King (1000-1500 times liquid) and other drugs can be sprayed.

5. Fusarium wilt: Generally, before the onset of the disease, 90% carbendazim (500-600 times the solution) or 50% enoylmorpholine (1000-1500 times the solution) can be used to irrigate the roots, each plant can be filled with kilograms of liquid medicine, irrigated once every 10 days, and irrigated 2-3 times.

2. Prevention and control measures (1) Seed selection. Seeds are harvested from disease-free seed plants and disease-free seeds are selected. (2) Seed treatment.

The commercial seeds should be treated well before sowing, and the seeds can be soaked in 55 warm water for 10 minutes and then moved into cold water to cool, and then removed and dried to promote germination and sowing. (3) Stubble rotation. Repeated-disease plots are encouraged to rotate crops with other crops for 2 to 3 years to reduce field pathogens**.

4) Strengthen field management. Open the drainage ditch system to reduce the groundwater level, reasonably dense planting, open the shed for ventilation in a timely manner, reduce the humidity in the shed, increase phosphorus and potassium fertilizer, improve the disease resistance of plants, and use clean water for watering. (5) Clean up the countryside.

In the early stage of the disease, prune and shoot in time, remove diseased leaves and old leaves, clean up the field after harvest, remove the diseased residues, and take them out of the field to bury or burn. Deep ploughing of the soil, irrigation of the protected land and stuffy sheds, high temperature and high humidity can promote the decomposition and decay of residual tissues, reduce the survival rate of pathogenic bacteria, and reduce the source of re-inhabited bacteria. (6) Chemical control.

Spraying should be started at the beginning of the disease, spraying once every 7 10 days, and 2 3 times in a row. The agent can choose 47% Garinon wettable powder 600 800 times liquid (125 165 grams per mu), 700 times Pulik water-soluble liquid (130 grams per mu), 800 times of Fenghu amine wettable powder (125 grams per mu, 600 times DT wettable powder (165 grams per mu, 700 times of wettable powder (130 grams per mu), etc.

Spot disease is a common disease of tomatoes, and if it is not treated in time, it will affect the yield and quality of tomatoes. So what is the cause of its onset, and how to prevent it? Let's take a look.

Symptoms: Tomato bacterial leaf spot disease mainly affects leaves, stems, flowers, petioles and fruits. The leaves are susceptible to the disease, producing dark brown to black irregular spots, 2 4 mm in diameter, with or without yellow halos around the spots.

The petioles and stems have similar symptoms, producing black spots but no yellow halos around the lesions. The lesions are easy to connect into plaques, and in severe cases, a section of the stalk can turn black.

Prevention and control methods: strengthen quarantine to prevent the introduction of infected seeds into non-epidemic areas; Establish disease-free seed fields and use disease-free seedlings; Crop rotation with non-Solanaceae vegetables for more than 3 years. Seed treatment.

Soak the seeds in 55 warm water for 30 minutes, or soak the seeds with acetic acid solution for 24 hours, rinse off the liquid with water after soaking, and then promote germination after a little drying. Pharmaceutical prevention and control. In the early stage of the disease, 400 500 times of 77% copper hydroxide wettable powder, or 600 times of copper hydroxide water dispersible granules, spray once every 10 days or so, and spray 3 or 4 times in a row.

Use of agents: the first choice can kill 2000, followed by streptomycin.

Concentration: 20001000 times the solution, 3000 times streptomycin 4000 times the solution.

Control period: leaf spraying begins at the seedling stage, and the second time after planting the seedlings, and the third time after the interval of 7 days and 10 days, can effectively prevent and control the occurrence and spread of tomato bacterial leaf spot.

Thanks for the reference.

Control methods: Agricultural control: remove weeds at the edge of the field and dead branches and rotten leaves after harvest, and destroy them in a centralized manner to reduce the source of mites.

Pesticide control: the insect is eliminated in the spot occurrence period. 73% alkyne mite 1500 times liquid spray; 25% acaricidal 1000 1500 times liquid spray.

Cyhalothrin EC 4000 times liquid spray. Bifenthrin EC or 5% Nisolan EC 3000 4000 times liquid spray. The above agents are sprayed once every 7 10 days, and 2 3 times in a row.

It mainly harms tomato leaves, stems, fruits and fruit stalks, and can be infected at the seedling stage and adult plant stage. Leaf infection, from the lower mature leaves to the upper part of the plant, first produces dark brown to black irregular spots, 2 4 mm in diameter, with or without yellow halos around the spots. Petiole and stem symptoms are similar to those of leaves, producing black spots but no yellow halos around the lesions.

The lesions are easy to connect into plaques, and in severe cases, a section of the stem can turn black. When it damages the flower buds, many black spots are formed on the sepals, and when the sepals are connected, the sepals dry up and cannot bloom normally. The small spots at the beginning of the young fruit are slightly raised, and the green color around the lesions tends to remain green for a long time when the fruit is nearing ripeness.

The flesh near the lesion is slightly depressed, black around the lesion, and the middle is light and slightly depressed.

Prevention and control method 1: Strengthen quarantine to prevent the introduction of infected seeds into non-epidemic areas. 2. Select disease-resistant varieties, establish disease-free seed fields, and use disease-free seedlings. 3. Seed treatment Before sowing, the seeds should be treated, and the seeds can be soaked in 55 warm soup for 20 minutes, then moved into cold water to cool, and then dried to promote germination and sowing.

4. Implement crop rotation with non-solanaceae vegetables for more than 3 years. 5. Attention should be paid to avoiding the spread of diseases in irrigation, pruning, pruning, harvesting and other agricultural operations. Use drip or furrow irrigation as much as possible, and avoid sprinkler irrigation as much as possible.

6. For the prevention and control of chemical control agents, you can choose 77 to kill 500 times of wettable powder, or 300 times of 14 copper ammonia aqueous solution, 500 times of copper succinate wettable powder, or 72% agricultural streptomycin or 4000 times of neophytomycin, and prevent disease once every 5-7 days.

FYI!

Fungal spots should be treated with difenoconazole, or pyraclostrobin, tebuconazole, or enazole, or azoxystrobin, or etherstrobin, etc.

Bacterial spots, diseases caused by bacterial infection, with mesobiomycin, or allicin, or polyantimycin, or agricultural streptomycin, or ocpticonine acetate, or chlorbromoisocyanuric acid, or spring thunder king copper, or thiamium copper, or thiasesen copper, or quinoline copper, or copper hydroxide, or cuprous oxide, or copper oxychloride, or methyl frost copper, or copper cyrope, or copper pininate, etc.

Tomato spot disease mainly damages leaves, but can also damage stems and fruits. Small necrotic spots appear at the beginning of the disease, followed by enlargement of the necrotic area; The lesions are grayish-yellow to yellowish-brown with purplish-brown whorls or a yellow halo around the edges, and the diameter of the lesions varies from 1 15 mm. When wet, the affected area produces dark gray mold, and in severe cases, the leaves die and wither.

The pathogen overwinters in the soil with hyphae and conidia with the diseased residues, and carries out initial infection when the conditions are suitable in the following year.

It occurs in both open fields and sheds, and is prone to high humidity conditions after temperatures of 20 to 25 and continuous rain.

It is recommended to spray 500 times of 36% thiophanate-methyl suspension or 50% mixed floating agent, 600 times of 40% multi-sulfur suspension, 800 900 times of 50% compound thiophanate-methyl wettable powder, 1000 times of 50% carbendazim wettable powder and 1000 times of 75% chlorothalonil wettable powder, once every 10 days or so, and 2 3 times of continuous treatment.

FYI!

1. Choose disease-resistant (resistant) varieties.

The selection of resistant varieties is an economical and effective measure to prevent and control the disease. Breeding and introduction of disease-resistant and high-yield varieties according to local conditions.

2. Seed treatment.

The disease is mainly transmitted by infected seeds, so seeds are disinfected before sowing. The method is: soak the seeds in 55 warm soup for 30 minutes, and stir constantly, soak for 2 hours after the water temperature drops down, and then promote germination and sowing, or soak the seeds with 3% Zhongshengmycin wettable powder 600 800 times for 30 minutes, wash and sow seeds.

3. Timely crop rotation.

Crop rotation with non-Solanaceae vegetables for more than 3 years to reduce initial infection**.

4. Strengthen cultivation management.

After harvesting, remove the diseased residues and surrounding weeds in the field in time, and bury them deep outside the field; When the humidity in the field is high, try to avoid agricultural operations such as pruning and pruning; Pay attention to ventilation and control the temperature and humidity in the shed; When planting, avoid damaging the roots; Reasonable dense planting and increased field permeability; Use a dropper or furrow irrigation to avoid flooding as much as possible.

5. Soil disinfection.

In areas with severe disease, soil disinfection can be used to reduce the amount of bacteria in the soil. In the summer of high temperature, the stuffy shed treatment is carried out, the soil in the shed is irrigated with water, and the film is mulched, and the sun is dried at high temperature for 4 to 6 weeks; Or 1 month before planting, soil treatment with calcium cyanide or Vibaimu can effectively prevent the occurrence of the disease.

6. Chemical control.

In the early stage of the disease, timely medication can be used, and the agent can be 1500 times of 46% copper hydroxide water dispersible granules, or 800 times of 3% Zhongshengmycin wettable powder, or 800 times of 2% Chunleimycin aqueous solution, or 100 million cfu·ml-1

Bacillus subtilis 500 times liquid spray control. Try to choose a dry afternoon spray. In addition, attention should be paid to cross-rotation of drugs with different active ingredients to delay the emergence of antimicrobial resistance of pathogenic bacteria.