What are the pests and diseases of sweet potatoes and what are the main pests of sweet potatoes? How

There are several common pests and diseases of sweet potato:

Viral disease, leaf spot, scab, sweet potato blast, sweet potato vine cutting disease, sweet potato soft rot, etc.

The first method of disease prevention and control is to use detoxification seedlings and disinfection of seedlings; The second is to carry out pharmaceutical prevention and control according to different diseases. Control and prevention of physiological diseases: due to soil deficiency, physiological deficiency, poor environment and other factors (too dry, too wet, daily burning, high temperature, low temperature) and other physiological diseases, it causes a variety of physiological diseases such as deficiency, sunburn, aging, weakness, wilting, etc.

Control methods: select resistant varieties or non-sensitive varieties; Choose robust varieties that grow strongly; Proper watering to keep the surface and plants dry; Maintain proper density; Crop rotation can be reduced by maintaining crop rotation on planting plots. For non-infectious diseases, sulfur and copper preparations are used for prevention and control.

For bacterial diseases, such as soft rot, proper watering and watering at the same time keep the surface and plants dry. Fungal diseases, such as downy mildew, rust and other soil-borne diseases, can be prevented by mulching and drip irrigation to keep the environment dry.

1. Leaf rollers.

Symptoms: Leaf curlers generally hide on the back of sweet potato leaves, and then slowly roll up the sweet potato leaves from a corner, and finally slowly gnaw all the mesophyll of sweet potato leaves from the inside, leaving only a layer of film and leaf stems, when the disease is more serious, you will find that the field is bare, although the sweet potato grows in the soil, but it still needs to photosynthesize, so it will affect the growth of sweet potato.

Control methods: for the prevention and control of leaf rollers, we can only use pesticides to spray and kill, when we find that the sweet potato leaves in the field have leaf curls, we first see if it is caused by leaf rollers, if so, then we can use trichlorfon crystals for control.

2. Viral diseases.

Symptoms: The symptoms of viral disease are large and small spots on sweet potato leaves and sweet potato stems, and then slowly deepen and spread, resulting in a phenomenon of death and decay of the whole plant, which is mostly caused by improper water management in the field.

Prevention and control methods: too much water in the field, will cause bacterial infection, and the formation of viral diseases, the best way to prevent and control is to strengthen the water management in the field, in the field when planting, a good ditch in the field, so as to facilitate the drainage after the rainfall, when the rainfall is more, to dredge the ditch in time, the water is discharged, so that it is generally difficult to get sick. If the disease develops, then we can use chlorothalonil solution for prevention.

3. Nematode disease.

Symptoms: nematode disease mainly harms the fruit of sweet potato, followed by the stem of sweet potato will also appear this symptom, the surface of sweet potato has brown spots, is one by one, as if bitten by insects, when the sweet potato is broken open, the flesh inside the sweet potato is bad, this is due to the nematode crawling over, and gnawing on the surface, and then after the disease penetrates deep into the fruit, seriously affecting the quality of sweet potato.

Control methods: for the control method of nematodes, we generally choose varieties with strong disease resistance when selecting seeds, followed by pesticide treatment compared to seeds when sowing, and finally do insecticide treatment on the land of cuttings, so that the planted sweet potatoes have a certain immunity to nematodes to a large extent, and the impact will not be so great. Secondly, when we plant, we can sprinkle some avermectin 10-20 times in the soil, which can also play a good protective role.

4. Soft rot.

Symptoms: Sweet potatoes are not the same as normal when they are dug up, they are already rotten when they are dug up, and if you touch it, it will emit a foul smell, so that the sweet potatoes are completely bad and can not be reused, the cause of this disease is also due to too much moisture in the field, followed by missing the best harvest period and being frozen, so it seriously affects the yield and quality of sweet potatoes.

Prevention and control methods: first of all, we should strengthen the intensity of field management, followed by timely harvesting, so that it will not be frostbitten, and finally the sweet potatoes collected are soaked in carbendazim solution once or twice and then fished out, dried and then collected, so that there will be no soft rot.

The pesticides used to plant sweet potatoes to control underground pests include matrine aqueous agent, lesben, chlorantraniliprole, etc. The swelling period of sweet potatoes is the period when more water is needed, and the roots of sweet potatoes can be irrigated with matrine 1000 times when watering. Crop rotation can also be used to prevent underground pests and reduce the number of pests.

When preventing pests, it is important to note that farmyard manure must be fully decomposed before application, as the smell of uncooked farmyard manure will attract underground pests.

1. Sweet potato pesticide control underground pests

1. The pesticides used to control underground pests include matrine aqueous agent, Lesben, chlorantraniliprole and other agents. When the sweet potato is swelling, this stage needs a lot of water, and it can be combined with watering to apply 1000 times of matrine water agent to the root of the sweet potato, and the control effect is better. During the normal growth period of sweet potatoes, foliar sprays of Xerox 1000 times can be carried out, or 35% chlorantraniliprole suspension, and each package of agent can be mixed with 15 kg of water when used.

2. You can also use the method of crop rotation to prevent underground pests, and the number of pests can be reduced through crop rotation, and then the pesticide can be used for control, which can improve the efficacy. Sweet potatoes are more drought-tolerant, underground pests are mainly produced according to the growth characteristics of sweet potatoes, they are resistant to dry soil but not waterlogging, and the fields with frequent underground pests can be rotated with water and drought during the prevention and control, which effectively reduces the occurrence of underground pests.

3. When using farmhouse fertilizer for sweet potatoes, it must be fully decomposed before application, because farmhouse fertilizer without rotting will emit the smell that underground pests like, which is conducive to the reproduction of pests. If you use uncooked farm manure for a long time, there will be more and more underground pests, and even if pesticides are used for control, after the effect of the pests disappears, the pests will reappear and continue to harm.

Second, what are the main underground pests of sweet potatoes?

1. Grubs: Grubs are the larvae of beetles, which mainly feed on the underground parts of the young roots and stems of crops, and they will bite or bite off the roots of crops to make the seedlings wither and die.

2. Needleworm: Needleworm larvae will harm seeds and germs, and in severe cases, there will be many small holes in the rhizomes of seedlings, resulting in dead seedlings, lack of seedlings or tuber rot.

3. Mole crickets: Mole crickets will harm the seeds that have just been sown or germinated and feed on the tender stems, bite the young stems into a mess, and at the same time, the roots of the seedlings will be separated from the soil, causing the seedlings to wither and die.

4. Ground tiger: larvae have a mixed feeding habits, they will lurk in the soil during the day, and they will come out at night, which will lead to serious lack of seedlings and even destruction of crops.

5. Termites: Termites are very harmful to sweet potatoes, and they can directly hollow out sweet potatoes, which will lead to a decrease in sweet potato quality and yield in serious cases.

6. Root aphid: Mainly concentrated in the taproot, sucking the root juice, causing the lower part of the taproot and fibrous roots to become thinner, atrophy, blacken and even rot.

Sweet potatoes are mainly affected by grubs and black spot disease. Grubs mainly come from the larvae or eggs or soil caused by underground pests, so fertilization is reasonable, the farmyard manure is completely rotten, and the grubs have to eat the rotten farmyard manure, which can reduce the damage to the sweet potato. Secondly, choose excellent varieties with strong disease resistance and use fertilizers rationally.

Sweet potatoPlanting requires plenty of sunlight.

Sweet potatoes need plenty of sunlight. Like other silk plants, sweet potatoes can use sunlight to take advantage of carbohydrates, such as starch from carbon dioxide gas absorbed from the air and water absorbed from brushing soil. This function is called photosynthesis.

The carbohydrates produced by the photocontract action are delivered to the sweet potato chunks, and the sweet potato chunks increase. When sunlight is insufficient, photosynthesis is slow, tooth yield is small, and sweet potato yield is not high. Therefore, when growing sweet potatoes, we should pay attention to the propagation of light, and here's why.

How to choose a sweet potato variety?

There are many varieties of sweet potato, which can be divided into pink sweet potato, white sweet potato and sweet potato according to the skin color of sweet potato; According to the color of the sweet potato heart, it can be divided into sweet potato, purple sweet potato, yellow sweet potato, white sweet potato, powder sweet potato, etc. Each type of sweet potato has a different yield and taste. In my experience, purple sweet potatoes taste best, but not everything is absolute.

It is also associated with post-planting fertilization and management, but with the same fertilization and management, purple sweet potatoes are more popular. <>

Sweet potatoes should be weeded in time.

After planting sweet potatoes, it doesn't take long for weeds to appear on the land. When growing traditional sweet potatoes, farmers usually don't use herbicides, so weeds must be thoroughly removed in a timely manner at an early stage. After planting sweet potatoes, after the rain, there is more grass.

After the surface of the soil has dried slightly, combine it with a cultivator hug, that is, loosen the soil with straw or other tools while removing weeds. This traditional practice has many advantages, namely that weeds can reduce soil hardening, destroy the soil layer, and play a role in irrigation. <>

Aphids and golden nematodes are very common pests, and for pests that harm roots and stems, they are generally prevented in advance.

For the sweet potato plant, it is a very common food on people's tables, and the occurrence of pests in the local sweet potato cultivation is not very different from pests in different periods. At the seedling stage, it is mainly ground tigers and aphids, and in the middle and late stages, it is mainly sweet potato moth and Spodoptera litura. Therefore, we must also learn to master certain knowledge in life, and we must also learn to observe in advance in the process of planting sweet potatoes, and reducing dead seedlings is the most important thing.

Sweet potatoWhat are the pests?

The larvae of the beetle will gnaw on the roots and stems of the ground, and in the process of the growth period of the sweet potato, they will bite the young roots of the germ and the tuber to cause the root seedlings to wither or the tuber to rot.

Sweet potatoHow should insect pests be controlled?

After harvesting sweet potatoes in autumn, you can choose to spread more than 1,000 kilograms of straw straw on each acre of land, and put 50 100 kilograms of quicklime for deep ploughing. This will help the soil to enhance its nutrition and ensure a good harvest in the coming year.

What is my personal opinion?

In the process of reopening the control of sweet potato, we must be bold and careful, there are a large number of insect pests, timely through chemical control, can effectively avoid the spread of pests, and do not recommend the use of high concentration of pesticides, because high concentration of pesticide pollution is more serious, while killing pests, it will also lead to sweet potatoes to be affected to a certain extent, where conditions can be used to use water and drought rotation, effectively cut off the transmission route of infection, and ensure the healthy growth of crops.

Spodoptera litura, sweet potato moth, sweet potato wheat moth, leaf miner moth and other moth pests.

It can be sprayed and controlled from the egg hatching period to the beginning of the 2nd instar larvae, and the optional pesticides are 10% chlorfenapyr suspension 1500 times liquid, 08% emamectin EC 1500 times, 15% indoxacarb suspension 4000 times, 5% lice mite urea EC 800 times, bifenthrin EC 2000 times, 5% fluoropyridine urea EC 2000 times, 20% chlorantraniliprole suspension 3000 times, 10% trifluoromethanyl ether EC 1000 1500 times or 24% methoxyfenozide suspension 2000 2500 times and other spray control.

Black spot can occur, root rot can occur, soft rot can occur, stem nematode disease can occur, and potato blast may also occur. Pesticides can be used for control, and limestone and sulfur can also be used to sterilize and disinfect the soil.

Good morning! The main potato diseases were potato late blight, potato early blight and potato ring rot.

The main insect pests are potato ladybugs, potato tuber moths, aphids, etc.

In order to reduce the occurrence of pests and diseases, seed potatoes can be soaked with pesticides or dressed. In the prevention and control of potato blight, 400 times of 25% methamanine wettable powder can be used to make disinfectant water soaking seeds, or the use of 35% methanofen seed dressing agent according to the seed potato mass of O 4% of the seed potato mass dressing, or 58% of the mass fraction of methamanine manganese-zinc wettable powder according to the quality of the seed potato 03% for seed dressing; In the prevention and control of potato ring rot, it can be soaked in the amount of 50 mg of copper sulfate per kilogram of seed potato for 10 min; Potato aphids can be treated with 68% imidacrine seed dressing according to seed quality.

FYI! Happy work!

There is a product in Liaoning that is very easy to use, treating root-knot nematodes and preventing and killing underground pests.

Sweet potatoes are susceptible to underground pests, forming insect paths, and sweet potatoes rotting, which has a very serious impact on the yield and quality of sweet potatoes, and cannot be eaten and processed when serious. There are many kinds of underground pests, and the main ones that harm sweet potatoes are grubs, mole crickets, ground tigers, crickets, needleworms, sand latent root nematodes, etc. There are several ways to prevent and control them:

1. Chemical control, sweet potato seedlings use phosphine capsules and other roots, and apply 3% phoxanthion granules when the sweet potato is raised (the number is determined by the number of underground pests, 5-10 kg per mu); 2. Agricultural methods such as crop rotation and stubble, deep ploughing and ploughing, and timely irrigation are used to prevent and control crop rotation; 3. For the use of chemical fertilizers, it is recommended to use low-N avermectin organic fertilizer and high-content biological fertilizer to effectively inhibit the number of diseases and insects in the soil; 4. It is best to recommend the use of detoxified sweet potato seedlings in grassy soil, and the use of high-cut sweet potato seedlings to prevent viruses and insect pests although potato seedlings are brought into the soil.