Many potato nuggets are seriously rotten, what causes them and how to prevent them?

There are three main reasons for the rot of sweet potatoes during the harvest period, one is that soft rot occurs in sweet potatoes, the second is that sweet potatoes are infected with black spot disease, and the third is that sweet potatoes are affected by frost damage. Let's analyze it in detail with you.

Soft rot is one of the most common diseases of sweet potatoes, a fungal infectious disease that is highly contagious. Especially during the harvest and storage stages of sweet potatoes, soft rot is most likely to occur. After the occurrence of soft rot, sweet potatoes will appear gray-white mildew, and the color of mildew will gradually turn dark black with the aggravation of the disease, showing a water-soaked shape.

In the later stage, the affected area will gradually expand, and gray-black mold mycelium will appear, and the whole sweet potato will appear soft and rancid.

Solution: Sweet potato soft rot, we must do a good job in prevention and control. First of all, stop watering about two weeks before the harvest of sweet potatoes to avoid the moisture content of sweet potato stems being too high and affecting the later storage.

Secondly, the harvesting time should be grasped well, and the harvest should be carried out on a sunny day, and try not to cause trauma to the potato pieces to avoid wound infection. Sweet potato nuggets should be harvested in the process of selection, disinfection, wound drying and healing, etc., to avoid soft rot during the storage of potato nuggets. In the process of sweet potato storage, it is necessary to pay attention to the temperature and humidity of the sweet potato cellar, and at the same time pay attention to the disinfection of the sweet potato cellar.

Sweet potato black spot is also one of the important diseases that endanger the growth of sweet potato, and the whole growth process of sweet potato, including the later storage stage, is easy to cause black spot damage. After the onset of sweet potato black spot disease, it first manifested on the leaves, with yellow spots on the leaves and gray-white mold layers on the back of the leaves. In the later stage of the disease, the underground stems of sweet potatoes will rot and be soft muddy, and gray-black mold will appear in the affected parts.

Solution: Sweet potato black spot disease should be prevented, selected before sowing, minimized washing, reasonable crop rotation, cultivated strong seedlings, and improved the disease resistance of sweet potato seedlings. In addition, it is necessary to do a good job of disinfection and spray 50% carbendazim before seedlings.

1000 times solution of wettable powder, soaking treatment before sowing. Once a disease is found, spray it with 50% carbendazim 1000 to 2000 times solution in a timely manner, or spray with 50% tobuzin wettable powder 700 times solution. The spraying frequency is once every other week, about three times in a row.

Sweet potatoes have a thin skin and a high moisture content. When the growing temperature is below 9 degrees Celsius for a long time.

Potato nuggets are susceptible to physiological frost damage. After frost damage, the normal metabolism of potato nuggets will be seriously disturbed, resulting in a decrease in the resistance of sweet potatoes and susceptibility to pathogens, resulting in large surface rotting of sweet potatoes.

Solution: For the problem of low temperature frost damage, the first thing to do is to harvest in a timely manner, autumn sweet potatoes should be harvested before the beginning of winter, and summer sown sweet potatoes should be harvested before frost. When the temperature drops to around 18 degrees, the harvest can begin.

Pay attention to avoid trauma during the harvesting of sweet potatoes, and after harvesting, they should be properly dried and disinfected before storage, and the temperature in the cellar should be controlled during storage to avoid freezing damage to sweet potatoes.

It may be that there is a lot of water in the soil, the sweet potatoes are soaked in the water and rot, or there may be insects. The correct way to control it is to reduce watering and spray the plant with insecticides immediately if you notice bugs on the leaves.

It is very likely that the potato nuggets will be severely rotten when they are placed in a humid environment, so it is best to keep the potato nuggets in a cool, dry environment without contact with moisture.

When planting green beans in early spring, we must choose cold-resistant, good disease resistance, high performance, high-quality varieties two, the choice of soil green beans do not need much good land, whether marl or sand can grow well, as long as it can be well drained and irrigated in the planting field, but the fertile soil can get high yield production three, seedling 1, green beans have strong cold resistance, do not use high temperature environment, the temperature is more than 25, will affect the effect of flower bud differentiation, transplanted to the greenhouse planting after the greenhouse seedlings, Small shed planting can be done around mid-February, firstly, the seedbed is thinned with a width of 1,2 m, while the depth of the trough is 20 cm, the length of the compartment can be determined by the amount of sowing, watering sufficiently, then smooth the top with a sand board, using a nylon thread to become 9 cm wide, then cut into a square of 9,9, choose a 1, 2 cm square with a knife to pick out the depth of the nest.

Sweet potato root rot is the formation of black-brown lesions from the tip or middle of the root, and then most of the roots turn black and rot. The underground stems are infected and form black spots, and the epidermis is longitudinally cracked. In severe cases, the diseased tissues are loose, the diseased plants are short, the internodes are shortened, the leaves are yellow or purple and wriveled, thickened and brittle, and the leaves wilt or even dry up and fall off in case of drought or sun exposure, and the growth is stagnant, resulting in a large lack of seedlings or even no harvest.

The surface of the diseased tubers is rough, covered with many black-brown lesions of various sizes, and most of them are round. The epidermis does not rupture in the early stage of the lesion, but in the middle and late stages, the subcutaneous tissue becomes black and loose, and a new layer of epidermis can be formed at the junction between the bottom and the healthy tissue. During storage, the lesions do not expand, the diseased potatoes have no bitter taste, and there is no hard heart when cooking.

Prevention and control methods: 1Choose high-yield and disease-resistant varieties, such as Shangshu 19, Jishu 21, Xushu 25, etc.

2.Clean the farm, dispose of the remains of diseased plants, dry and burn them; Don't use diseased potatoes as seed potatoes.

3.Improve cultivation techniques and strengthen field management: deep soil ploughing, early seedling strengthening in due course; Before the peak of the disease, water in time in case of dry weather.

4.Crop rotation and stubble. Sweet potatoes and wheat, corn, cotton, peanuts and other crops should be rotated in the severely diseased plots, which can reduce the occurrence of diseases. Generally, crop rotation for more than 3 years is implemented.

5.Establish disease-free seed land to prevent the spread of seedlings.

Sweet potato root rot is also called sweet potato root rot disease, the yield of the diseased plots is reduced by 10% to 20%, and the yield is reduced by 40% to 50% in the heavy cases, and even dies in pieces, resulting in a dead harvest.

Sweet potato root rot mainly occurs in the field stage. Damage sweet potato seedlings, starting from the tip or middle of fibrous roots, local black necrosis, and then expand to the whole root to turn black and rot, and spread to the underground stems, forming brown depressions and longitudinal cracks, and loose subcutaneous tissue. The internodes of the above-ground seedlings are shortened and dwarfed, and the leaves are yellow.

If the disease is mild, a large number of buds and flowers appear on the seedlings after autumn; If the disease is severe, all the underground rhizomes will turn black and rot, and the main stem will dry up from the bottom up, causing the whole plant to die. The surface of the diseased tuber is rough, covered with black-brown lesions of different sizes, cracked in the middle and late stages, and the subcutaneous tissue turns black.

It is normal for sweet potatoes to rot in winter, so choose to separate the bad ones and store them in the cellar for the winter so that they will not spoil.

Choose disease-resistant varieties to sow and plant early, plant disease-free and strong seedlings, deeply turn over the soil, increase net fertilizer, and water in a timely manner, establish three no-left seed land, and cultivate disease-free seed potatoes.

Root rot of sweet potatoes is generally caused by root rot, and the prevention of root rot should be done as follows:

1. Choose good sown varieties with disease resistance.

2. Plant early in a timely manner, plant disease-free and strong seedlings, deeply turn over the soil, increase net fertilizer, and water in a timely manner.

3. Establish three no-left seed land and cultivate disease-free seed potatoes.

4. Crop rotation with peanuts, sesame, cotton, corn, sorghum, millet, green manure and other crops for more than 3 years.

When planting, you can use dry farmer "Gen Shangya" to irrigate the roots, which can effectively prevent root rot.

If the temperature drops suddenly and the harvest is not timely, the sweet potatoes will suffer from frostbite and frost damage, resulting in rot due to frost damage, affecting the harvest quality and yield. Prevention and control measures: Sweet potatoes should be harvested in a timely manner.

To determine the harvest time according to the weather and temperature, you can also look at the growth of sweet potato vines, which begin to turn yellow and dry up, and the harvest time is almost the same.

Like some people in our village, they use a little open space in front of the house and behind the house to grow sweet potatoes every year.

However, when harvesting sweet potatoes, it is always found that some potato pieces have rotted, and even some are more serious, and they will be thrown away directly, which is a pity and has caused a lot of losses to hard-working farmers.

What causes the tubers to rot

First, before harvestingOur sweet potato fields are soaked with too much water, resulting in stagnant water, which is not discharged in time.

As a result, the sweet potato stems in the soil are soaked for a long time and gradually rot, which will lead to the severe rot mentioned later, affecting the yield and quality.

[Prevention and control measures].

Before the sweet potatoes are harvested, we can no longer water them, and we must keep the ground dry, easy to harvest, and easy to store. Even if there is stagnant water, it should be drained in time to avoid soaking in stagnant water and rotting of potato pieces.

SectionSecond, the sweet potato tuber is rotten, and it is also possible to suffer from sweet potato stem rot。Basically, there are black-brown spots on the edge of the contact between the soil and the stem, and when you peel it off, you will find that the rhizome is rotten, and then the tuber is rotten.

Underground pests are vegetarian, ready-made sweet potatoes, sweet and fragrant, the wounds and insect eyes left after being bitten by insects are soaked in water before they heal, and the results can be imagined, slowly rotting and deteriorating.

[Prevention and control measures].

This is the common pest and disease of sweet potato, once found, it must be timely, otherwise the consequences are very serious. In order to quickly treat the abrasion of the grandson, drug control has to be mentioned.

SectionThird, if the temperature drops suddenly and the harvest is not timely, the sweet potatoes will suffer from frostbite and frostbiteCause rot due to frost damage, affecting the quality and yield of harvesting.

[Prevention and control measures].

Sweet potatoes should be harvested in time. To determine the harvest time according to the weather and temperature, you can also look at the growth of the red stool potato vines, which begin to turn yellow and dry up, and the harvest time is about the same.

Fourth, try not to hurt the sweet potato pieces during harvesting, as the broken potato pieces are prone to rot.

I think it's because you're watering too much. You should do proper watering and fertilization.