How to identify common pests and diseases of tomatoes? How can it be prevented?

Look at the leaves of tomatoes to see if there are holes, if there are definitely pests, you can buy some pesticides to control them.

On the leaves and fruits, the leaves are curved, stiff, and elongated, and the leaflets are incapacitated, longitudinally wrinkled, and the leaf margins are twisted and deformed. The fruit damage is manifested as fruit deformity, the most common being the mastoid umbilical fruit. Choose disease-resistant hybrids to prevent aphids in advance.

The main diseases are virus disease, late blight, gray mold, leaf mold, early blight and canker disease, etc., spray pesticides regularly, keep ventilation, and watering under the film.

1. Prevention and control at the sowing stage

1) Choose disease-resistant (resistant) varieties with good commerciality and high yield according to local conditions, such as Maofen 802, Jiafen 17, Jiafen 10, etc.

2) Seed treatment: The seeds are treated at high temperature to kill the pathogenic bacteria attached to the surface. The following methods are used for the main local diseases.

3) Seedbed: mix 50% carbendazim wettable powder with 50% Fumei double wettable powder according to 1:1, or 25% methalin wettable powder and 70% mancozeb wettable powder according to 9:

1. Mix, mix 8-10 grams per square meter with 15-30 kg of fine soil. When sowing, 1 3 is spread on the bed, and the remaining 2 3 is covered with seeds.

4) Install insect-proof net: The air outlet of the shed is closed with an insect-proof net, with a hole diameter of 25-40 mesh and a width of 1-meter, covering the air outlet.

2. The tomatoes planted in the gray mold shed are seriously diseased.

1) Appropriate application of phosphorus and potassium fertilizer to improve plant disease resistance. Drip irrigation and dark irrigation technology are used to prevent flooding. In the early stage of the disease, remove the residual petals and stigma, diseased leaves and fruits, and pull out the diseased plants in time to prevent the spread of the disease.

2) Pharmaceutical control: smoke fumigation, dust control of pests and diseases, compared with conventional spraying, has the advantages of not increasing the humidity in the shed, reducing labor intensity, saving pesticides, etc., and different methods can be selected according to the specific situation.

3. Early blight:

1) Diseased leaves and fruits, timely ventilation and moisture dissipation in the shed.

2) Pharmaceutical prevention and control. At the beginning of the disease, spraying and application began, and it was done once every 7 days.

4. Late blight:

1) First of all, we should control the temperature and humidity, try to reduce the temperature and humidity in the shed, control it at 26-30 during the day, and control it at 20-24 at night. Timely ventilation and humidity dissipation to keep the relative humidity at 60-70. After the onset of the disease, remove the diseased leaves and fruits.

2) Pharmaceutical prevention and control: pesticide application begins at the early stage of the disease.

5. Leaf mold:

1) Remove the lower diseased leaves in time at the early stage of the disease.

2) In the prevention and control of early blight and late blight, it can be considered to treat both, but the back of the leaf should be the main thing when spraying. Pharmaceutical control can be controlled by dust agent or fumigant.

6. Viral disease: Tomato virus disease.

The main symptoms in the field and among the fields are mosaic and leaf type, fern leaf type, stripe type and so on. In recent years, tomato stripe spot virus disease has become more and more serious. Prevention and control measures:

1) Shoot the branches at night and prevent aphids early. Late thrashing can reduce and delay the transmission of tobacco mosaic virus from agricultural practices; Early control of aphids can prevent the occurrence and spread of cucumber mosaic virus.

2) Pesticide control: 100 times of 83 anti-agent is used, and sprayed once at the seedling stage and after the seedling is slowed.

The leaves will turn yellow and droop, the size of the tomato will be small, it will not keep warm, and the growth will not be very good, and the size will not be there; Watering more, fertilizing more, the temperature should be suitable, there should be a certain amount of sunshine, spraying nutrient solution, and also spraying insecticides.

A common ailment of tomatoes is late blight. Viral diseases, bacterial wilt, cotton bollworm. These diseases can cause the fruit of the plant to grow poorly.

A common symptom is infection of mosaic streaks. In severe cases, the entire plant can be infected. If a bollworm is encountered, it is necessary to carry out insect fighting.

Spray the insecticide at regular intervals. For example, 15% avidoxin emulsifiable concentrate 1000 1500 times liquid.

Late blight mainly harms the leaves and fruits of tomatoes, and the seedlings and adults will be infected, such as seedling stem disease, seedling stem disease, disease spots above the branches and leaves, and leaf death, white mildew layer will also appear in humidity, and gray-brown disease spots will appear in the adult leaves. Control methods: strengthen field management, improve plant stress resistance, watering on sunny days, do a good job of ventilation and humidification, reasonable dense planting, timely pruning and crossing, improve field ventilation and light transmission conditions, in the early stage of the disease, can use 72% downy mildew net wetting powder diluted 800 times, spray once every 7 10 days, the effect is very good.

Viral diseases. It is mainly manifested as mosaic type, stripe type, fern leaf type, with slight markings on the leaves, purple veins, dark brown to dark brown stripes on the stems, and the plants wither and die in the later stage, the diseased fruits are deformed, and irregular necrotic spots appear. Control Method:

Disease-resistant varieties were selected, planted early, watered in time during the fruit expansion period, soaked with 10% sodium nitrate before sowing, and sprayed with 8% Ningnan water agent 800 1000 times or zinc sulfate 1000 times or 20% morpholinoguanidine ethyl copper wetting powder after the effect, and the effect was very good.

1. The main common pests and diseases of tomatoes The main pests and diseases of tomatoes are leaf mold, virus diseases, late blight and aphids. The symptoms are as follows: Tomato leaf mildew:

The site of the disease is on the leaves, which have irregular yellow-green spots. On the back of the diseased leaves, the white mold layer gradually changes to a dark brown mold layer. Tomato virus disease:

Tomatoes in autumn are susceptible to viral diseases, and aphids are the main vectors of the disease. Yellow-green stripes appear on the diseased leaves, which make the leaves shrink, the leaves become smaller, the veins are transparent, the leaf margins are curled, and the fruits are susceptible to striated lesions. Botrytis cinerea:

This disease damages the leaves and fruits. Starting at the tip or margin, it gradually changes from dark green to brown. Green fruits are susceptible to this disease, and initially change from dark green to dark brown.

When the ambient humidity is high, oil stains of white mold appear on the lesions. Tomato aphids: Aphids mainly feed on the sap of tomato plants, curling and turning yellow leaves, and are the main pests that transmit viral diseases.

2. The main tomato pest control methods The prevention and control of tomato diseases and pests should be based on prevention and comprehensive management. First of all, it is necessary to select good seeds, and then disinfect the seeds, and the seedbed is disinfected as much as possible. We can press 50% carbendazim wettable powder and 50% fumei double wettable powder by 1:

Mix in a ratio of 1 and cover the seeds with about 8-10g m2 and 15-30kg of fine soil. Apply heavy base fertilizer, increase phosphorus and potassium fertilizer, spray 6000 times Aiduo liquid, enhance disease resistance, and prevent aphids in the later stage. Avoid soil moisture or stagnant water, and remove and destroy diseased plants in time.

Leaf mold control: spray with 83,100 times after seedling stage and slow seedling stage. Prevention and control of viral diseases:

500 times of 20% virus A wettable powder, or 800 times of curative emulsion, or 2000-3000 times of 25% thiamethoxam water dispersible granules. Prevention and control of gray mold: spray 50% mancozeb 800-1000 times on the affected area, and spray on the soil surface at the same time, spraying once every 15 days or so, a total of 2-3 times.

Aphid control: 1000-1500 times of imidacloprid EC or 1000-1500 times of 4% Jianzhu EC can be sprayed and killed. In short, there are many common pests and diseases in tomatoes, but the main ones are leaf mold, virus diseases, late blight, and aphids.

In terms of prevention and control methods, prevention is the mainstay, and comprehensive prevention and control is carried out. The prevention and control were carried out from the aspects of seed selection, seedbed disinfection, field management, and chemical control. Early detection and prevention.

If there is anything wrong with the above introduction, please correct!

Common pests and diseases of tomatoes are bacterial wilt, early blight, late blight, gray mold, virus disease, in the process of control, it is necessary to spray carbendazim solution to tomatoes every other week to eliminate the bacteria on the plant, and can also regularly ventilate tomatoes, maintain air circulation in the environment, avoid bacterial breeding, and let tomatoes grow healthily.

1. Bacterial wilt

A common pest and disease of tomato is bacterial wilt, after the appearance of bacterial wilt, the leaves of tomato will wilt from top to bottom, affecting the growth of plants. In the prevention and control of bacterial wilt, it is necessary to soak the tomato seeds, soak them in the green enjoyment agent, and take them out after ten minutes to improve the disease resistance of the seeds.

2. Early blight

Tomato common pests and diseases also have early blight, its main symptoms are manifested in the leaves, stems and flowers and fruits of the appearance of black spots, and continue to expand, in the prevention and control of early blight, can be in the tomato seedling stage and growth period, every other month for it to spray the green enjoy agent, to eliminate the bacteria on the plant, so that it can grow healthily.

3. Late blight

Tomato common pests and diseases are late blight, the main symptoms of which are the blackening of seedlings, leaves and stems, which eventually lead to the lodging of the whole plant, in the prevention and control of late blight, the tomato can be irrigated at the seedling stage, and the roots are watered with carbendazim solution to destroy the bacteria in the soil and restore the growth of the plant.

4. Botrytis cinerea

Botrytis is also a common pest and disease of tomatoes, and its main symptoms are rotting and falling flowers and fruits, and dry and yellowing leaves. In the prevention and control of gray mold, you can spray clovelinol agent on tomato plants to avoid the breeding of gray mold, and can also ventilate tomatoes to maintain air circulation in the environment.

1. Tomato early blight: tomato early blight is also called spot disease, the lesion is round or nearly round, black and brown, mainly harms tomato leaves, sometimes harms stems and fruits, high temperature and high humidity are easy to get sick, and the pathogen is a fungal semi-known fungus. To timely ventilation and dampness to reduce the occurrence of early blight, the prevention and control of early blight can be treated with 75% chlorothalonil or 50% iprodione spray according to 600 times each according to 600 times to prevent or treat the effect is good, and the smoke shed can be smoked with chlorothalonil aerosol agent.

2. Tomato late blight: tomato late blight belongs to the fungal oomycetes, which has become the most important control object of tomatoes with fast onset and strong destructiveness, and generally late blight first invades from the leaf edge, and then develops into black-brown spots, and infects the stem and fruit, causing the stem to turn black-brown around the stem, and the fruit does not become soft at the beginning, and it becomes dark green after being soaked in oil. The germs are spread by wind, rain and watering, and the disease is severe due to low temperature, high humidity, poor ventilation, and poor ventilation.

Late blight can be sprayed with frost 600 times to prevent and control, when the disease is serious, it can be sprayed with enoylmorpholine plus quasi-energy, and the fog agent can be smoked with frost plague smoke killer.

3. Tomato cotton blight: tomato cotton blight is a fungal egg disease, commonly known as "falling eggs". At the beginning of the disease, the leaves have green spots, and then they are soaked in water, and the fruit is mostly affected in the shoulder area, and the light brown spots appear to be striated, and the humidity is high, and the cotton white mold grows.

Cotton blight disease is severe at high temperature and humidity or at ground temperature and humidity. The prevention and control of cotton blight can be the same type of drugs as the prevention and control of late blight, which can be controlled by downy mildew and copper amber (copper melocy) spray, and can also be treated with dalianga enoylmorpholine spray.

Summary. Hello, tomatoes are common dual-purpose agricultural products, it likes to grow in a suitable temperature environment, which can effectively avoid the occurrence of pests and diseases, thereby improving the commodity attributes of tomatoes, in addition, the fertilization and watering of tomatoes determine the yield and quality, and have a certain preventive effect on pests and diseases, so what are the common pests and diseases of tomatoes and control methods? Let's find out!

Hello, tomatoes are common vegetables and fruits with two feet of agricultural products, it likes to grow in a suitable temperature environment, which can effectively avoid the occurrence of pests and diseases, thereby improving the commodity attributes of tomatoes, in addition, the fertilization and watering of tomatoes determine the yield and quality, and have a certain preventive effect on pests and diseases, so what are the common pests and diseases of tomatoes and control methods? Next, let's bend the silver high together!

1. Blight is easy to cause the disease at the seedling stage, after the onset of the disease, the tomato seedlings will grow poorly, and the leaves will gradually die in the later stage, and the disease will appear dark brown rot lead rot spots, and the spread speed is very fast. Control method: Strengthening water and fertilizer management is the first step to prevent tomatoes from appearing pests and diseases, and spraying brassinolide water agent at the seedling stage to enhance plant disease resistance.

Spraying thiophanate-methyl or dimethazin at the beginning of the disease, spraying once every 7-10 days between hail can have a good prevention and control effect.

2. Fusarium wilt disease is a soil-borne disease, which occurs at the flowering and fruiting stages, one side of the leaf turns yellow, browns, and dies directly in the later stage, and the young roots will also be parasitic and spread when there is a lot of rainfall. Prevention and control methods: the selection of disease-resistant varieties, crop rotation stubble planting, and tomatoes to fertilizer requirements are stricter, fertilization must be controlled to avoid pests and diseases because of fertilizer, and pay attention to soil disinfection, with mildew wettable powder dipped in roots, after the onset of the disease, you can also use allicin emulsifiable concentrate to irrigate the number of sengen control.

3. Botrytis gray mold The disease mainly affects the fruit of tomatoes, causing the peel of Zhaoxiaoqi to appear gray-white and water-stained, soft and rotten, and the fruit stalk will also appear gray-brown mold layer, and the fruit will lose water and become rigid. The leaves die directly. Prevention and control methods:

Strengthen ventilation at ordinary times, and pay attention to controlling the light intensity, reduce the humidity of the field branches, improve the disease resistance of tomatoes, and spray the watering of Heling to avoid excessive water, increase the probability of disease, remove the diseased leaves in time, and use chlorothalonil smoke removal agent for fumigation and disinfection to avoid tomatoes susceptible.