What medicine is used for watermelon vine blight, what medicine is used for watermelon vine blight.

Today, when we went to the melon field, we found that the watermelon we planted was infected with germs and necrosis, so we were ready to use pesticides! Today we are going to share some common sense of watermelon planting to prevent germs.

Watermelon is easy to cause various symptoms in the planting process, vine blight is often encountered, it is an important disease on watermelon, and currently mainly relies on chemical control. However, long-term use of a large number of fungicides, especially systemic drugs with a single site of action, can easily make pathogens resistant. It has been reported that the pathogen of watermelon blight has developed resistance to azoxystrobin, thiophanate-methyl and benomyl, and it has been reported that it has developed resistance to carbendazim in China.

At present, there are few drugs registered for watermelon to prevent and control vine blight, so does watermelon vine blight need to use imported drugs?

Watermelon vine blight does not need to use imported drugs, through many tests have confirmed that acetamide and difenoconazole have a good preventive effect on watermelon vine blight, these two drugs have no cross-resistance, can be used alternately, in order to delay the emergence of bacterial resistance, prolong the service life of the agent, but also conducive to expanding the bactericidal spectrum.

Watermelon vine blight does not need to use imported drugs, and can effectively prevent vine blight by alternating the use of two drugs, acetamide and difenoconazole.

Answer: Hello, watermelon vine blight with acetimidine and difenoconazole can play a protective role, these two drugs have a good preventive effect on watermelon vine blight, and there is no cross-resistance, can be used alternately to delay the emergence of bacterial resistance. I hope my answer will help you. [Happy].

Asking questions is now **, not prevention.

Answer: During the onset of the disease, you can spray 45 kg of water with 60 grams of 80% multi-fu zinc wettable powder + 15 grams of 25% difenoconazole emulsifiable concentrate + 120 ml of Luoxiao Wang foliar fertilizer per mu. It can also be sprayed with 3000-5000 times of 25% difenoconazole emulsifiable concentrate, 600 times of 75% chlorothalonil wettable powder, 800 times of 70% methyl tobuzine wettable powder, etc., sprayed once every 5-7 days, sprayed 2-3 times, and the effect is better.

Precautionary measures:

1. Apply sufficient basal fertilizer (can use Aonong Le microbial fertilizer), properly control watering, to keep the root soil not too wet, promote the growth of plants, improve disease resistance, and reduce the incidence of disease.

2. Agricultural operation: After falling vines, tendrils, side branches, and old leaves, etc., use R. solanacearum + Diliwang spray, which can sterilize, supplement trace elements, and promote wound healing.

3. If the central diseased plant is found, it should be uprooted, buried or burned in time.

Leaf spot disease, downy mildew, fruit rot, anthracnose, vine blight and other leaf and fruit diseases can be sprayed twice with R. solanacearum Rick 90-150 times + garlic oil 1000-1500 times, and the third time with R. solanacearum 90-150 times + Diliwang 300 times + Wofonsu 600 times, with an interval of 2-3 days each time; In addition to spraying, it is necessary to irrigate the roots with 90-150 times of R. solanacearum + 300 times of Diliwang + 600 times of Wofengsu in addition to spraying. If the condition is severe, chemical drugs can be appropriately compounded.

The specific drugs for watermelon leaf blight include chlorothalonil wettable powder, Sukrin wettable powder, and mancozeb wettable powder.

1. Chlorothalonil wettable powder: This drug is an excellent protective fungicide, which is characterized by high efficiency, low toxicity, low residue and wide bactericidal spectrum, which can effectively prevent and control a variety of diseases on fruit trees, vegetables, flowers, forests, cotton and other crops.

2. Suclin wettable powder: the drug is a low-toxicity and high-efficiency fungicide, its original powder is white or light brown crystals, and almost insoluble in water, but soluble in acetone, xylene, slightly soluble in ethanol.

3. Mancozeb wettable powder: the drug has broad-spectrum and protective properties, and can prevent and control a variety of diseases on fruit trees, vegetables, flowers and other crops.

Symptoms: Watermelon vine blight mainly harms melon vines, leaves and fruits, and the lesions appear as water-stained dots at first. Pharmaceutical prevention and control:

Spray with Duofu zinc wettable powder and difenoconazole emulsifiable concentrate mixed with water. Apply fertilizer: apply more well-rotted organic fertilizer and cake fertilizer to improve the resistance of plants.

Seed disinfection: Seed dressing with antimicrobial wettable powder.

1. Symptoms

Watermelon vine blight mainly harms melon vines, leaves and fruits, and the lesions are water-stained small spots at first, and gradually expand into yellow-brown, blue-gray round or irregular spots, and in severe cases, the whole plant appears yellowish and wilted.

2. Pharmaceutical prevention and control

In the early stage of watermelon vine blight, 60 grams of 80% Duofu zinc wettable powder, 15 grams of 25% difenoconazole emulsifiable concentrate, and 120 ml of Luoxiaowang foliar fertilizer were sprayed with 45 kg of water per mu, sprayed once in 5-7 days, and sprayed 2-3 times in a row, and the effect was better.

3. Apply fertilizer

In the process of cultivating watermelon, sufficient base fertilizer should be applied, more rotten organic fertilizer and cake fertilizer should be applied, nitrogen, phosphorus and potassium should be applied together, nitrogen fertilizer should not be applied partially, and top dressing should be applied in time during the full fruit period to prevent plant defertilization and premature aging, and improve the disease resistance of watermelon.

4. Seed disinfection

In order to prevent watermelon from being infected with vine blight, you can use 50% compound carbendazim to soak the seeds in 500 times of the floating agent for 60 minutes, and then soak the celery in 55 warm water for 20 minutes, which plays a role in disinfection and sterilization and reduces the breeding of germs.

Symptoms of watermelon vine blight: seedlings are infected, mostly at the fork of the cotyledons, at first water-soaked, then brown, necrotic and shrunken, and the diseased part produces small black dots.

At the onset of the adult plant stage, the leaf lesions are brown at first, round or semicircular, and then develop into gray-brown lesions with obvious edges, and the lesions converge with each other to form irregular large spots in the later stage, or a single lesion develops into a nearly circular large spot, the center of the lesion is gray-brown and the edge is dark brown, with concentric ring patterns and obvious small black spots, and finally the lesions spread to the whole leaf to make the leaves black and die.

The petiole and vine are diseased, at first they are water-soaked small spots, and then they become brown fusiform to irregular necrotic spots, and the whole plant dies from small to small, and many black spots are produced on it. At the beginning of the disease, the melon and fruit formed amorphous water-soaked brown necrotic spots, which rapidly developed into nearly circular gray-brown water-soaked necrotic spots, and the diseased melons rotted with the development of the disease, and finally produced black spots on the surface of the lesions.

Cultivation management can be strengthened to prevent and control. During the prevention and control, it is necessary to apply sufficient basal fertilizer, apply more decomposed organic fertilizer and cake fertilizer, and apply nitrogen, phosphorus and potassium together, and do not apply nitrogen fertilizer. After the rainstorm, remove the stagnant water in the field in time.

Timely topdressing at the peak fruit stage to prevent plant defertilization and premature aging. After the plant is filial and sick, remove the diseased leaves and vines in time. After harvesting, the residue of diseased plants and weeds in the melon orchard should be thoroughly cleaned up, and buried and destroyed in a centralized manner.

Onset conditions

After transplanting the host crop, the radiated spores are transmitted by wind or agricultural operations, and invade the host body through wounds, cracks and stomata of the plant. The surface of the seed can also carry bacteria and cause disease in the seedlings. At a temperature of 5-35, germs can be infected.

When the temperature is 26-30 and the relative humidity of the air is 80-92, the disease occurs most severely.

Acidic soils with a pH of 4-6 are susceptible to the disease; The diseased and residual bodies in the melon orchard were not removed in time, resulting in a high incidence of diseases. Continuous rainy weather is conducive to the onset of the disease; melon continuous cropping, low-lying terrain, water accumulation after rain, serious disease; Fields with high groundwater table, lack of fertilizer and weak growth will have severe disease; The greenhouse cultivation density is large, the ventilation is poor, the humidity is too high, and the disease is serious.