CATDOLL : CATDOLL: What are the methods to prevent and treat fish white skin disease?

1. What are the methods to prevent and treat fish white skin disease?

Treatment methods: (1) Thoroughly clean and disinfect the pond; regularly spray 50ml/mu of mold net or 50ml/mu of dithiocyanate methane; (2) Orally take Lifuyukang + high-efficiency immune polysaccharide + high-energy immune VC mixed with bait for feeding, and use it for 5-7 days; 1. Pathogen: White-skinned Pseudomonas aeruginosa 2. Symptoms: When the disease begins, the disease develops at the end of the tail fin and quickly spreads to the back half of the fish's trunk. The spread part appears white, so it is also called white tail disease. In severe cases, the tail fin of the diseased fish rots or is incomplete. Soon, the head of the diseased fish is facing down and the tail is facing up. It struggles and flows in the water and soon dies. 3. Epidemic situation: The epidemic season of this disease is from June to August 4. Prevention methods: (1) Thoroughly clean and disinfect the pond; regularly spray 25ml/mu of mold net or 25ml/mu of dithiocyanate methane. (2) Orally take Lifuyukang + high-efficiency immune polysaccharide + high-energy immune VC mixed bait and feed it for 5-7 days.

2. Can fish infected with Nocardia be eaten?

cannot

The epidemic season of Nocardia in sea bass is relatively long, and it occurs from April to November every year, with the peak of the disease occurring from June to October. The fish that are infected are often 1 or 2 years old. The disease can be prevalent when the water temperature is between 15℃ and 32℃, and the disease is most serious when the water temperature is between 25℃ and 28℃. The disease is characterized by a long incubation period and slow progression, but high morbidity and mortality rates. The natural incidence rate can reach 15% to 30%, and in severe cases it can reach more than 60%. The mortality rate of farmed California sea bass after Nocardia can be as high as more than 80%. Therefore, once farmed fish are found to have Nocardia, they should be treated in time. The earlier the treatment, the fewer the number of infections, the higher the cure rate, and the smaller the economic losses caused to aquaculture production.

3. How to prevent and control rice virus diseases? What are the methods for preventing and controlling rice virus diseases?

1. Prevention and control strategy[1]: Adopt the prevention and control strategy of “cutting off the source of the disease, controlling pests and controlling diseases” to control the damage caused by stripe leaf blight and black-streaked dwarf disease, while also controlling the stem borer and the chilo suppressalis, laying the foundation for a bumper rice harvest.

2. Time of application: Apply the medicine 3-5 days after transplanting (machine planting); apply the medicine as soon as direct-seeded rice turns green, and apply the medicine for the second time after 5-7 days.

3. Pharmaceutical formula:

①Use 60g of 25% pyrifos + 60ml of 30% thiazolin + 30ml of 2% amino oligosaccharide or 60g of 50% chlorobromoisocyanuric acid mixed with 20-30kg of water for even spraying per mu;

②Use 100 ml of 45% rice poison + 30 ml of 2% amino oligosaccharide or 60 g of 50% chlorobromoisocyanuric acid mixed with 20-30 kg of water per mu and spray evenly;

③Use 15g of 25% pymetrozine + 60ml of 30% thiazolin + 30ml of 2% amino oligosaccharide or 60g of 50% chlorobromoisocyanuric acid mixed with 20-30kg of water for even spraying per mu. III. Precautions 1. To improve the control effect, add 20ml of flusilazole prochloraz, and pay attention to the combination of fast-acting and long-lasting agents, and use different agents alternately;

2. It is necessary to use pesticides for comprehensive prevention and control at a unified time, and use pesticides on weeds along roads, canals and ditches at the same time to ensure the prevention effect;

3. It is prohibited to use highly toxic and high-residue pesticides.

4. Dissolve chlorobromoisocyanuric acid in water first, then add other fungicides and pesticides.

4. How to prevent and control sweet potato virus disease? What are the prevention and control methods for sweet potato virus disease?

Sweet potato virus diseases can be spread through farm tools, aphids, wind and rain, etc., causing large-scale virus infection. Continuous cropping and improper field management will cause severe disease, resulting in a large reduction in sweet potato production.

Essentials of prevention and treatment:

1. Rotate crops reasonably, select disease-free and disease-resistant varieties, and use disinfectants before planting to reduce the spread of bacteria in seed potatoes and cultivate healthy and strong seedlings.

2. After the sweet potatoes emerge, spray the new lipid film 800 times solution in time to protect the plants to isolate the bacteria from infecting and prevent the virus-free seed potatoes from being infected with the virus. Timely control of aphids, whiteflies and other spreading pests to effectively reduce the source of viral diseases in the field.

3. Increase the intensity of field inspections, and remove and destroy diseased plants in a timely manner. Apply more phosphorus and potassium fertilizers, and spray Diguo Zhuangdiling + Baneda Bika potassium dihydrogen phosphate on the leaves to improve the sweet potato's ability to absorb water and fertilizer, and promote the rapid expansion and development of underground tubers. Ensure sufficient water and fertilizer supply in the field to promote high and high yields of sweet potatoes.

5. How to prevent and control apple rot?

Apples are fruits that can be stored for a relatively long time, but once they get rot, it is difficult to cure them. In serious cases, they can destroy a large orchard. So what are the ways to prevent and control apple rot? In fact, there are several ways!

The first one is the copper sulfate mud method. This method is particularly easy to use, but it is generally better not to use it because it contains a slightly higher level of chemical ingredients. So try not to use it if you can. If you want to use it, use 50% copper sulfate solution and add some clean fine soil, then mix it into a paste. Apply it evenly to the diseased area of ​​the apple, just make sure it is slightly larger than the actual area you apply it to!

The second method is the concentrated alkaline water method. This method requires the edible alkali we use when steaming buns at home and then add water to make a solution with a concentration of 1%. Use a small brush to evenly apply this prepared medicine to the scar area. Generally, it is brushed once every two days and it will take 3 to 5 days to complete the scar!

The third method is the sugar garlic liquid method, which is to crush the garlic that is not usually eaten and then mix it with vinegar. The ratio requirement is not very high, about 1:1. After the preparation is completed, leave it for about 3 days and apply it to the rotten part of the apple to see results quickly!

The fourth method is the oil application method. The oil application method mentioned here is not the oil we eat, but the butter we usually use. Apply this oil evenly on the scar. Generally, applying it three times in a row can basically achieve the desired result!

The fifth method is to apply human urine. It is best not to use this method publicly. If used publicly, it may affect the subsequent sales of the fruit. Just use a knife to make a small cut in the rotten part of the apple and then brush it with human urine about 2 times a day. Generally, it can be completely cured in about 5 days!

The sixth method is to use the table salt we use at home, add water and mix until evenly mixed, then apply it to the prepared salt water. Generally, it can be completely cured in about five days!

The seventh method is the re-bark scraping method. In August and October every year, the base of the trunk of the apple tree should be re-scraped, and about 1MM of bark should be scraped off. Generally, when scraping the rough bark and old bark, remember not to touch the bottom layer of the bark, otherwise it is very likely that the apple tree will be scraped to death.

The last method is to use iodine to treat the scars that have been scraped clean. Apply it once every 10 days on average, which means you can achieve the desired results in about a month!

6. How to prevent and control fruit tree rot?

Take fresh soil and mix it with clean water until it is moist enough to stick to the bark. Apply it on the scar of the fruit tree with a thickness of 3-5 cm and 5 cm beyond the scar. Then wrap it tightly with plastic film to prevent moisture evaporation and mud from falling off. After one year, remove the plastic film and mud. In this way, the aerobic bacteria will suffocate and die due to long-term lack of oxygen. The cure rate of this method is over 90%.

7. How to prevent and control kidney bean yellow leaf disease?

1.

If yellow leaves appear over a large area, it is related to nutrient deficiency. The veins of old leaves turn yellow mainly, which is mainly caused by magnesium deficiency. The new leaves turn yellow or white, which is related to zinc, iron, and manganese deficiencies.

Yellow leaves caused by nutrient deficiency should be prevented in advance. At the same time, it should be noted that the weak growth of kidney bean plants will definitely affect the root system. We must ensure healthy growth, and root promotion is the foundation.

2.

During the entire growth stage of kidney beans, micro-root calcium + energy + impact magnesium can be applied underground to supplement calcium and phosphorus to promote root growth, improve the root nutrient absorption capacity, and supplement magnesium, zinc, iron, and manganese. To prevent and reduce the problem of yellow leaves and premature aging due to nutrient deficiency, add micro-root calcium + energy + impact magnesium each time you apply the pesticide to protect the leaves and reduce

8. How to prevent and control camellia leaf blight?

There are many reasons for the withering leaves of camellia. If it is caused by too strong light, it is necessary to block the sunlight in the summer to avoid prolonged exposure to the sun.

If it is caused by improper watering, the frequency of watering needs to be improved. Too much or too little will affect the normal growth of the plant.

If it is caused by improper fertilization and too much fertilizer is needed, the excess fertilizer needs to be discharged to avoid root burn.

9. What is the best way to prevent and treat Sclerotinia disease?

Step/Method 1

1. Crop rotation: Implement crop rotation with gramineous crops for more than 2 years or water-land rotation. In the southern melon-growing areas, watermelon is planted after late rice.

Step/Method 2

2. Adjust temperature and control humidity. Promote the application of under-film hose drip irrigation technology, which can save water and reduce humidity in the greenhouse. In the morning on sunny days in early spring, keep the greenhouse covered to allow water droplets on the roof to atomize. Ventilate and dissipate moisture in time at noon. Cover and keep warm at night to reduce condensation on leaves.

Step/Method 3

3. In the early stage of the disease, you can use 40% Sclerotinia net wettable powder 100-150g/mu, add 50kg of water for spraying, or use 50% Boscalid water dispersible granules 30-50g/mu, add 30-50kg of water for spraying. Spray once every 7 days, and spray 2-3 times in a row.

Step/Method 4

4. For protected cultivation, in the early stage of the disease, 0.25 kg of the medicine can be used in each greenhouse, and it can be fumigated once every 8-10 days, and fumigated 2-3 times in a row.

10. How to prevent and control taro spot disease?

1. Reasonable density planting

Select disease-free seed taro or select seed taro from disease-free or slightly diseased land, and dry them for 2-3 days before sowing. Avoid continuous cropping of taro fields for many years. It is best to rotate water and dry land. During cultivation, over-dense planting, excessive nitrogen fertilizer or lack of fertilizer will also cause serious disease. Use high ridges and single rows for planting, with 3,000 plants per mu being appropriate, and deep planting is recommended.

2. Drain water in time

When it rains, the ditch should be cleared and drained in time, especially in the rainy season, to prevent waterlogging, which can effectively reduce the occurrence of taro spot disease, soft rot, blight and other diseases. In the late growth period, fertilizer and water should be controlled to avoid the vigorous growth of new leaves, delay maturity, and affect the yield and quality of taro.

3. Strengthen management

Strengthen water and fertilizer management, avoid excessive application of nitrogen fertilizer, add organic fertilizer and superphosphate as base fertilizer, and topdressing can be wood ash, potassium sulfate, etc. Wood ash also has a dehumidifying effect. Potassium dihydrogen phosphate can also be added in the middle and late stages of growth in combination with disease and insect prevention to improve the plant's disease resistance and help reduce the occurrence of the disease.

4. Chemical control

You can use 20% Jebendazole emulsion, or 64% alum wettable powder, or 50% thiophanate-methyl wettable powder, or 50% carbendazim wettable powder for prevention and control. Spray once every 7-10 days, and spray 2-3 times in a row.