Melon, the front and back of the leaves are spotted

Mainly downy mildew, the resistance is different in different places, it is recommended to choose one or two mixtures (in severe cases) and use alternately with one or two ingredients such as enoylmorpholine, manganese zinc frost urea, downy mildew hydrochloride, methalen manganese zinc, sulfoxaline manganese zinc, cyanofrostazole, fluether amide and other ingredients (in severe cases).

If it is a protected greenhouse, pay attention to controlling the humidity, and on rainy days, it is recommended to use chlorothalonil fogging agent to control the condition. ）

Prevention first, comprehensive prevention and control (prevention of diseases, dosage reduction). Use pesticide ingredients alternately, and do not use the same pesticide ingredients consecutively. This is the principle of crop protection.

It is recommended to mix bacterial pesticides such as streptomycin or mesomycin or thiamethone or chunleimycin or thiazolezinc to prevent and control bacterial diseases.

Because the situation in the field is complex, you can't just look at the symptoms of a few leaves. It's important to take precautions.

Prevention and control methods of melon downy mildew.

1.Agricultural control: select Yellow River honeydew melon, red flesh reticulated melon, Snow White, Suizhou big white melon and other varieties resistant to downy mildew.

Implement crop rotation, drain water in time after rain, and avoid flood irrigation. Reasonable fertilization, timely vine arrangement, and maintenance of ventilation and light. Avoid adjacent or continuous cropping with melon crops, and adopt rain-sheltered cultivation methods if conditions permit.

7 After the rain in August, it is not advisable to water, if you need water, you should water half a ditch, and do not flood with water.

2.Nutritional control: After the melon flowering, the mu with a kilogram of urea, white sugar (or brown sugar) kilograms, 40 50 kg of water foliar spray, every 5 6 days 1 time, 4 5 times in a row, or mu with "Gaomei Shi UA-102 nutrients" and other organic active liquid fertilizer 50 times 50 70 kg sprayed on the foliar and root soil, 7 10 days 1 time, spray 2 times, in order to enhance plant resistance, prevent disease.

3.Pharmaceutical prevention and control: spray 70% ethylphosphorus and manganese-zinc wettable powder 500 times at the beginning of the disease, or 18% methyl frostamine and manganese-zinc wettable powder 600 times liquid, or 64% alum wettable powder 400 500 times liquid, or 72% gram anti-spirit wettable powder 800 times liquid, or 50% Fumei double wettable powder 600 times liquid, or 25% Ruixin mildew wettable powder 800 times liquid, or 20% benzalene emulsifiable concentrate 350 times liquid, or 72% Kelu wettable powder 700 times liquid, per 7 1 time in 10 days, 3 or 4 times in a row.

Bacterial disease or lack of what elements, or mosaic disease is also possible, affecting the growth of the disease?

Summary. The reasons for the spots on the melons: 1. The ventilation in the greenhouse is relatively late, which will cause the temperature in the greenhouse to be too high and the humidity to be too high.

When the canopy is uncovered, the temperature will continue to rise, resulting in a layer of water droplets on the surface of the melon, and if the temperature is ventilated, the melon will be very prone to green spots. Second, the density of planting is too large. In order to greatly increase the yield, many farmers increase the planting density of melon fields, which will cause the lower part of the melon seedlings to be closed, which will have a great impact on ventilation and light transmission, and eventually produce green spots.

Third, the time of pesticide application is wrong. In fact, the application of pesticides when the temperature is very high will cause the surface of the melon to be stained with pesticides, resulting in the formation of green spots. Fourth, when applying pesticides, if the concentration is too large, it will cause green spots on the melon surface.

The reasons for the spots on the melons: 1. The ventilation in the greenhouse is relatively late, which will cause the temperature in the greenhouse to be too high and the humidity to be too high. When the canopy is uncovered, the temperature will continue to rise, resulting in a layer of water droplets on the surface of the melon, and if the temperature is ventilated, the melon will be very prone to green spots.

Second, the density of planting is too large. In order to greatly increase the yield, many farmers increase the planting density of melon fields, which will cause the lower part of the melon seedlings to be closed, which will have a great impact on ventilation and light, and eventually produce green spots. Third, the time of pesticide application is wrong.

In fact, the application of pesticides when the temperature is very high will cause the surface of the melon to be stained with pesticides, resulting in the formation of green spots. Fourth, when applying pesticides, if the concentration is too large, it will cause green spots on the melon surface.

Measures to prevent spots: First, it is necessary to master the ventilation methods. Mastering good ventilation skills can avoid green spots on melon noodles.

The specific steps are: when the wind is released, it is the time when the temperature in the greenhouse rises. When the greenhouse film is uncovered, you can first open a round lead mouth on the upwind outlet, but the temperature in the greenhouse should not drop too quickly, the temperature in the shed should be slowly increased, and then slowly increase the upwind outlet, so that the water droplets on the surface of the melon mold cavity evaporate to nothing.

Finally, the temperature of the greenhouse is maintained to 28 degrees Celsius to 30 degrees Celsius. Even on cloudy days, ventilation should be done for a short time. Second, pay attention to planting density.

The planting density is too large, which will affect the yield of crops, and the planting of each mu usually needs to be 2500 to 2800 plants, and the grafted melons can be about 2500 plants, and the non-grafted melons can be 2800 plants. 3. The spraying time should be between 9 and 10 o'clock on a sunny day, and spraying pesticides after the temperature rises after 2 o'clock in the afternoon. Fourth, when spraying pesticides, the concentration or degree requirements are appropriate.

If the concentration is too small, it will not be effective in preventing and controlling diseases, and if the concentration is too large, it may cause pesticide damage, so it is necessary to prepare the pesticide solution according to the instructions.

Hello friend, glad to answer for you! The occurrence of melon spots seriously affects the interests of melon farmers, so how does the phenomenon of melon spots occur. Late ventilation causes high temperature and humidity.

After the shed is removed, a layer of water droplets is formed on the melon surface as the temperature increases, and ventilation at high temperature is easy to cause green spots. The density is too high. In order to increase the yield in the early stage and increase the planting density, some melon farmers have caused the lower part of the melon seedlings to be closed, which affects the ventilation and light transmission, and causes green spots.

Improper timing of medication. When the temperature is high, the medicine on the melon surface is easy to cause green spots. The concentration of the drug is large, so that the melon surface forms green spots.

I hope my clan Lu Xian will be helpful to you!

High temperatures or strong light exposure may also cause spots on melons**. In this case, the spots of the melon are usually some yellow or white spots with irregular shapes. Growth Stage:

Some melon varieties will have some natural spots during the ripening process. In this case, the spots are usually small black dots or light-colored dots with a regular shape. If the melon spots are not very obvious and there are no other symptoms, it will generally not affect consumption.

But if the melon spots are more severe, it is best not to eat them so as not to affect your health.

That's it, can you still eat this melon, does it have an effect on your body after eating, and the truckload of melons that sell melons is all like this.

In this case, the spots of the melon are usually some yellow or white spots with irregular shapes. Growth stage: Some melon varieties will have some natural spots during the ripening process.

In this case, the spots are usually small black dots or light-colored dots with a regular shape. If the melon spots are not very obvious and there are no other symptoms, it will generally not affect consumption. However, if the melon spots are more severe, it is best not to eat it, so as not to affect the health of the skin.

Summary. Causes of spots on the surface of melons.

1. Poor ventilation, resulting in high temperature and high humidity. After the shed is uncovered, a layer of water droplets is formed on the melon surface as the temperature rises, and ventilation at high temperature is easy to cause green spots.

2. The density is too large. In order to improve the yield in the early stage, some melon farmers will increase the planting density, resulting in the canopy closure of the lower part of the melon seedlings, affecting ventilation and light transmission, thus causing green spots.

3. Improper medication time. When the temperature is high, the medicine on the melon surface is easy to cause green spots.

4. The concentration of the drug is large, so that the melon surface forms green spots.

What is the condition of having spots on the melon.

The reason for the spots on the surface of melon 1. Poor ventilation, resulting in high temperature and high humidity. After the shed is uncovered, a layer of water droplets is formed on the melon surface as the temperature rises, and ventilation at high temperature is easy to cause green spots. 2. The density is too large.

In order to improve the yield in the early stage, some melon farmers will block the acacia and increase the planting density, resulting in the canopy closure of the lower part of the melon seedlings, affecting the ventilation and light penetration, thus causing green spots. 3. The time of medication is inappropriate. When the temperature is high, the medicine on the melon surface is easy to cause green spots.

4. The concentration of the drug is large, so that the melon surface forms green spots.

Preventive measures for spots on the surface of melons 1. Reasonable ventilation Skillful ventilation can avoid the formation of green spots on the melon surface. After uncovering the shed in the morning, you can first open the upwind outlet, but the temperature in the shed can not drop suddenly, with the increase of the temperature in the shed, gradually increase the upwind outlet, so that the water droplets on the melon surface slowly disappear. Finally, the temperature of the shed is maintained at about 28 30.

Even on cloudy days, ventilate for a short time. 2. The density of reasonable dense ridge splitting should not be too large, and the planting per mu is generally mastered at 2500 2800 plants, and the lower limit of grafted melons is taken, and the upper limit of non-grafting is taken. 3. Medication time The medication time is mastered at 9 10 a.m. on a sunny day, or after 2 p.m.

It is worth noting that there should be no water droplets on the seedlings before the shed. 4. The concentration of medication should be accurate. The concentration of preparation is small, can not achieve the purpose of disease prevention and treatment, the concentration is large, easy to cause drug damage, must be dispensed according to the instructions for use.

The above is the cause and preventive measures for the surface of the melon, the surface of the melon is actually caused by improper management, the melon farmers should pay attention to the daily management of the melon when they are in the morning socks, and prevent the problem of the surface of the melon in time. The long spots on the surface of melons will reduce the commerciality of melons, affect the economic benefits of melon farmers, and cause certain losses, so we must be careful.

Summary. It will affect the fact that the leaves grow too well, will not grow melons, and will grow less melons, there is that kind of medicine to control the growth of leaves, just hit it.

What's going on with the large melon leaves.

There is a problem with the pesticides or the fertilizers used.

It will affect the fact that the leaves grow too well, will not grow melons, and will grow less melons, there is that kind of medicine to control the growth of leaves, just hit it.

Can you tell me what kind of medicine to use to beat the leaves to control.

Tell me the secret recipe!

I'm going to ask about the place where the medicine is sold.

Summary. Silvery on the reverse side of melon leaves is a common disease, often known as "gray mold", the symptom is the appearance of light gray spots, crystals similar to glass beads, in a high temperature environment to develop a more serious disease, that is, the reverse side of the leaves are silver, causing considerable losses to crops. To avoid silvering on the reverse side of the leaf, there are a few suggestions:

1.Strengthen soil management, avoid waterlogging, maintain suitable soil humidity and temperature, and regularly carry out soil remediation and add organic fertilizers. 2.

Timely crop prevention and control, according to the diseased crops of plants, precise input of prevention and control agents, insect removal, timely prevention and control. 3.Strengthen seed testing and adopt strict testing methods to ensure that there are fewer seed diseases.

4.Scientific fertilization, through fertilizer ratio, on the basis of reasonable input of nutrients, to achieve the least input, to achieve the maximum benefit. Not only that, in order to ensure the health of melon plants, the seeds should be planted well, the seeds should have good freshness, and the fallen flowers that are susceptible to disease should be removed in time after flowering, so as to strictly prevent the spread and expansion of disease sources within the cultivation range, timely application of disease resistance agents and insecticides, and timely pruning of plants, reduce plant density, and play an active role in disease prevention and control.

The reverse side of melon leaves is a common disease, often known as "gray mold", the symptom is the appearance of light gray spots, crystals similar to glass beads, in the high temperature environment to develop to a more serious disease, that is, the reverse side of the leaves silver and clear color, causing considerable losses to crops. To avoid silvering on the reverse side of the leaf, there are the following suggestions:1

Strengthen soil management, avoid waterlogging, maintain appropriate soil humidity and temperature, and carry out soil remediation and add organic fertilizers during the bright and low period. 2.Timely crop prevention and control, according to the diseased crops of plants, precise input of prevention and control agents, insect removal, timely prevention and control.

3.Strengthen seed testing and adopt strict testing methods to ensure that there are fewer seed diseases. 4.

Scientific fertilization, through fertilizer ratio, on the basis of reasonable input of nutrients, to achieve the least input, to achieve the maximum benefit. Not only that, in order to ensure the health of melon plants, the seeds should be required to have good freshness at the time of planting, and the fallen flowers that are susceptible to diseases should be removed in time after flowering, so as to strictly prevent the spread and expansion of disease sources within the cultivation range, timely application of disease resistance agents and insecticides, and timely pruning of plants, reduce plant density, and play an active role in disease prevention and control.

Did I answer the wrong one?

It could be powdery mildew.

Melon powdery mildew is a common disease of melons and can cause serious harm. Symptoms: In the early stage of leaf disease, small white pink spots appear on the front and back of the leaf. It gradually expands into a white round pink spot, with multiple lesions connected to each other.

so that the leaves are covered with white powder. With the development of the disease, the color of the pink spots gradually turns grayish-white, and in the later stage, small black dots occasionally appear under the powder layer. Finally, the diseased leaves withered and died.

Prevention and control methods: 1. Agricultural prevention and control: 1After the harvest of the previous crop, the residues of diseased plants in the field were removed to reduce the source of infection. 2.Cultivate strong seedlings and improve the disease resistance of plants. 3.Apply enough farm fertilizer and increase phosphorus and potassium fertilizer to prevent plant growth and premature senescence. 4.

Prune and prune in time to ensure that the plants are well ventilated and transmitted. 5.Reasonable watering, timely unveiling of the shed for ventilation and moisture drainage.

2. Pharmaceutical control: spray 2% pesticide antibiotic 120 (pyrimidine nucleoside antibiotics) or 2% Wuyi mycin (BO-

10) 200 times of water solution or high-tech control white (ethoxystrobin), spray once every 6 7 days.