How to prevent sweet potato root rot?

The use of chemical spray or root irrigation, the method is the first choice of most growers, when the field after the root rot, timely to spray the pesticide to prevent and control, for sweet potato root rot, can be used difenoconazole, propiconazole, carbendazim, formabi, thiococcine copper + oxachlor, formamine + oxafen, etc., different dosage forms, the use of methods is also different, such as emulsifiable concentrate form is used to spray, and wettable powder is used to irrigate roots.

The best thing to do is to choose a disease-resistant sweet potato variety or plant detoxified sweet potato seedlings before planting.

Plant it separately from other crops, use it earlier if there are signs of illness, and don't water it at noon.

Hello, I have helped you find the result; Sweet potato seedlings have rotten roots in the ground, the following methods can be considered:1Land Preparation for Land Change:

If the decay is severe, consider changing the planting site. Remove the rotten sweet potato seedlings and the surrounding soil and set them aside, then re-cultivate the land and prepare the land, and wait for the soil to recover before expanding the planting scale. 2.

Sterilization treatment: During the storage of sweet potato seedlings, the breeding of germs and fungi can be effectively prevented through the appropriate amount of fungicide treatment. Sweet potatoes can be soaked for a period of time by adding an appropriate amount of bleaching powder or detergent to the poured water, and then drying them before planting.

3.Plant new sweet potato seedlings: Finally, consider replanting healthy sweet potato seedlings.

When purchasing new sweet potato seedlings, it is necessary to choose new varieties from formal channels to ensure that the roots are free of bacteria and fungi, and at the same time use the appropriate amount of organic fertilizers and nutrients to provide a favorable growth environment for the new sweet potato seedlings. In conclusion, in order to completely prevent root rot of sweet potato seedlings, it is necessary to follow a series of planting practices and management methods. For example, ensuring the right amount of water and nutrients, avoiding overwatering, and paying attention to soil ventilation and drainage can effectively prevent the root rot of sweet potato seedlings and increase the chance of successful planting.

Due to its high water content, sweet potato is prone to soft rot during storage, which is an important disease in the process of sweet potato harvesting and storage. If we don't value it, it can cause a lot of sweet potatoes to rot. Therefore, today Bian Xiao will learn about the control techniques of soft rot in sweet potato planting.

Conditions for the occurrence of soft rot in sweet potato cultivation techniques.

The causative agent of soft rot is Rhizopus creepingus, which belongs to the subphylum Compound Mycetes. The bacteria are found in the air, either attached to damaged potato chips or overwintered in storage cellars. Potato chunks are in an environment with a temperature of 15 to 25 and a relative humidity of 75% to 85%, which is the most suitable for the reproduction of the bacteria.

Sweet potatoes are most susceptible to infection when they have a wound or are frozen.

The main symptoms of soft rot in sweet potato cultivation techniques.

The pathogen of soft rot mainly infects potato tubers. In the early stages of infection, a grayish-white mold grows on the surface of the tubers, which then turns black or dark. Diseased tissue turns light brown when immersed in water.

Finally, a large number of grayish-black filaments and sporangia grow on the diseased surface, forming a large black hair that expands rapidly under the right conditions. After about two or three days, the whole potato was soft and rotten, giving off an unpleasant smell.

Prevention and control methods of soft rot in sweet potato planting technology.

1.Prevents frost damage. Frost damage to sweet potatoes is the main cause of soft rot during storage.

The earliest symptom of sweet potato soft rot is softening and then overflowing. Finally, white or off-white hyphae grow out of the diseased area, giving off the smell of sake lees. When sweet potatoes rot, they come out of the liquid and dip into the lower healthy sweet potatoes nearby.

The hyphae spread far and the infection was widespread, resulting in large areas of sweet potato rot. Frost-damaged sweet potatoes get sick after being put in the cellar first. Therefore, storing sweet potatoes in the cellar should prevent frost damage, avoid frost during harvesting, and keep the cellar temperature above 10 degrees after entering the cellar to prevent frost damage.

2.Avoid damage. Sweet potatoes suffer mechanical losses, the wounds are not completely healed, and they are prone to rot when they enter the cellar. Therefore, when harvesting sweet potatoes and sorting them into the cellar, care should be taken to prevent damage to the potato fragments and to prevent injured sweet potatoes from entering the cellar.

3.Dry in the ground. Sweet potatoes should be sun-dried in the ground at harvest time, especially in years with high soil moisture at harvest time. The moisture of sweet potatoes should be reduced by field drying, and field drying can also be used to achieve the purpose of disinfection.

4.Disinfect the potato cellar. Clean the sweet potato cellar 15 days before the sweet potato is put into the cellar, spray the sweet potato cellar wall with methyl tobuzin, or light the sulfur for disinfection, ventilate the sweet potato one week before entering the cellar, and prepare the sweet potato into the cellar.

5.Freshness. Soaking sweet potatoes with 800 times methyl tobuzin solution before entering the cellar can reduce the occurrence of sweet potato soft rot and achieve the effect of long-term preservation.

6.Regular check-ups. During the storage of sweet potatoes, the cellar should be checked frequently, and the sweet potatoes with moisture or mildew should be picked out and removed from the cellar in time to prevent them from infecting healthy sweet potatoes.

Soft rot is caused by too many bacteria in sweet potatoes, so it will be caused, at this time we should sprinkle some pesticides, and pesticides also need some nutrients and water, so that they can be fully eliminated.

Timely treatment of the surrounding weeds, to do a good job in the later drainage work, must be timely irrigation and fertilization, but also to spray a large number of pesticides to prevent and control.

At this time, don't continue to water, the main thing is to make the soil drier, and then spray some pesticides or fertilizers that can enhance resistance in time.

The prevention and control of soft rot needs to strengthen field management, pay attention to ventilation and light transmission, reduce field humidity, avoid flood irrigation, and pull out diseased plants in time when the disease occurs.

Harvest at the right time, and harvest potatoes on sunny days to avoid frost damage. When harvesting, it is necessary to avoid hurting the tubers as much as possible to reduce the channels for disease damage. Carefully screen, eliminate diseased potatoes, and dry them reasonably.

The storage cellar should be thoroughly cleaned and disinfected, and the cellar with a high incidence rate can be fumigated with sulfur. After the sweet potatoes enter the cellar, the daily management should be strengthened, the suitable temperature in the cellar should be maintained, and the cellar door should be opened in time for ventilation and humidity.

The damage should be locked, and it should also be watered frequently, paying attention to the ambient weather of sweet potatoes, so that soft rot can be prevented.

First of all, don't water too much, and don't accumulate too much water in the planting area, and then you should clean up the pests in time, and then you should also fertilize at regular and fixed points, and be sure to do a good job of ventilation.

Some pesticides should be sprayed, and some pesticides can prevent and control sweet potato soft rot.

Symptoms of Sweet Potato Soft Rot Sweet potato soft rot forms a gray-white substance on the surface of sweet potato at the beginning of the disease, which is mildew, and then gradually darkens and turns black. Eventually, decay and waterlogging gradually expanded, forming a large number of hyphae to spread further. A musty smell in the pantry can be smelled during the onset of the disease.

One reason why sweet potatoes are delicious is that sweet potatoes have a high water content, which is also one reason why sweet potatoes are prone to soft rot. Sweet potato soft rot is caused by a bacterial infection, but as the saying goes, flies don't lick seamless eggs. If sweet potatoes are mechanically damaged during harvesting and transportation or have frostbite during storage, they can be easily exploited by bacteria; If the storage environment has poor ventilation, high temperature and humidity or too low temperature, it is easy to induce soft rot of sweet potato.

Sweet potatoes suffer mechanical damage. Sweet potatoes are subject to mechanical damage due to improper handling during harvesting and transportation. Especially when harvesting, if there are few species here, we basically dig directly with shovels, which can easily cause damage to sweet potatoes.

It is recommended that it is best to dig the soil with a rake, and machine harvesting is also a good option if planting more sweet potatoes. The moisture content of sweet potatoes is also one of the causes of frostbite. Sweet potatoes will cause frostbite if they are stored under 9 for a certain period of time, and frostbite will occur after a period of time, so be sure to control the temperature of the storage room during storage.

Sweet potato frostbite is actually related to the time of harvesting. Some growers often harvest sweet potatoes very late to allow them to grow longer in the field for maximum yield.

If the temperature is too low at this time, it will inevitably lead to frostbite of sweet potatoes, and the gains outweigh the losses. When harvesting or storing sweet potatoes, the humidity is too high. If there is rain or too much watering in the late growth of sweet potatoes, the humidity of sweet potatoes will be too high.

If the sweet potatoes are not dried after harvesting and directly put into storage, it is easy to induce soft rot during storage. Improper storage conditions: If the storage environment of sweet potatoes is poorly ventilated and not breathable, resulting in abnormal respiration and even hypoxia of sweet potatoes, it is easy to cause sweet potato rot, and then induce sweet potato soft rot. In addition, high temperature, high humidity or low temperature under storage conditions can easily induce sweet potato soft rot.

Sweet potato soft rot control measures are harvested in a timely mannerUnder normal circumstances, when the soil temperature is around 18, sweet potatoes will basically not grow.

In order to prevent frost damage to sweet potatoes caused by too cold weather, it is more appropriate to harvest sweet potatoes around 18, and do not harvest sweet potatoes on cloudy or rainy days. Choosing several consecutive sunny days and cutting off the vines of the sweet potatoes before harvesting to allow the sweet potatoes to dry for two days can reduce soil moisture and reduce the mechanical damage of digging sweet potatoes. Before storage, air dry and pick sweet potatoes to clean the surface soil, and dry the surface for storage.

Not all sweet potatoes are suitable for storage. Injured sweet potatoes are prone to illness, so we need to take this sweet potato out individually**. This sweet potato is not only susceptible to disease, but it is also easy to spread after infection.

In order to prevent residual germs in the storage room, the storage room should be disinfected before storage, and sulfur fumigation is generally used.

First of all, it is necessary to sterilize in time, and it is necessary to avoid bacterial infection, and it is necessary to not take too long in the process of preservation, and it is necessary to pay attention to drainage, and to choose the right fertilizer and the right soil.

At this time, we must reduce the amount of watering, increase the light time, apply organic fertilizer or nitrogen, phosphorus and potassium fertilizer in time, supplement nutrition, and spray pesticides to prevent other pests and diseases.

Pesticides should be sprayed in a timely manner, and pests should be removed regularly, and the right medicine should be prescribed, and water and fertilizer management should also be strengthened, and it is also necessary to ensure that the light is sufficient and the soil is fertile, and the soil should be loosened in time, and the permeability of the soil should also be ensured.

Sweet potato soft rot, diseases caused by bacterial infection, with mesobiomycin, or allicin, or polyantimycin, or agricultural streptomycin, or occultamine acetate, or chlorbromoisocyanuric acid, or spring thunder king copper, or thiamium copper, or thiosenic copper, or quinoline copper, or copper hydroxide, or cuprous oxide, or copper oxychloride, or methyl frost copper, or copper complexa, or copper pine acid, etc.

Root rot of potatoes can greatly reduce the yield of potatoes, and root rot can be directly used to dismantle the soil of Haowanshi**, it is a new type of pure biological bacteriostatic agent for Laocha jujube, which can inhibit or kill pathogenic bacteria, and celebrate this pest against bacteria, fungi, viruses and other diseases, and have significant control effects.

The disease of potato root rot is caused by fungal infection, and the treatment of potato root rot in the plot that does not produce disease resistance can be effectively controlled by using broad-spectrum fungicides allicin, benzopropiconazole, methamethyl, etc. The possibility of restoring the healthy growth of medicated crops after the onset of diseases that have occurred to the root system is not very high, and the prevention and control of bacterial diseases in field planting is the main focus.

The potato root rot control measures are as follows:

1.Proper crop rotation.

Remove and clean up the diseased residues on the soil surface in time, apply fully decomposed farm fertilizer, deep tillage, fine land preparation, and use high furrow mulching for cultivation. It is strictly forbidden to flood irrigation to avoid water accumulation in the field after rain. Pay attention to the prevention and control of underground pests. Loosen the soil in time after watering to enhance soil permeability.

2.Establish disease-free farmland.

Disease-free tubers were selected as seed potatoes, high potassium fertilization was added, field management was strengthened, and pesticides were sprayed in time to improve the disease resistance of the plants.

3. Sterilize and disinfect the seed blocks before planting, and use fungicides and biological fertilizers to inhibit bacteria in the cultivated soil. In the early stage of growth, the root irrigation is carried out periodically with Trim microbial agent, which has bacterial disease prevention and aseptic rooting. After the occurrence of the disease, the diseased seedlings and surrounding weeds should be pulled out in time, effectively destroyed to avoid returning to the field, and the soil should be treated with bacterial fertilizer or fungicide for sterilization and disease prevention.

In addition to actively using biological fertilizer sterilization and disinfection, the growth stage can be used to prevent disease and increase the production of foliar fertilizer, and improve the stress resistance and disease resistance of potato seedlings.