Sweet potato leaves, what is the disease of rolling up, and how to treat it?

Sweet potato leaves rolled up is a curl leaf virus, which must be insects, spray some pesticides, and spray 30% suspension of biological pesticides to cure it.

Sweet potato planting long curly leaves should pay attention to reasonable fertilization, sweet potato fertilization has a variety of methods, such as base fertilizer, top dressing, etc. The application of basal fertilizer is more important for the whole growth period of sweet potato, and organic fertilizer is the main fertilizer, and basal fertilizer accounts for more than half of the whole fertilizer amount. Therefore, the base fertilizer is the base fertilizer during the growth period of sweet potato.

Sweet potato planting area has increased dramatically in recent years, but improper use of drugs will have a serious reduction in yield, harvest and other situations, here is the common situation of sweet potato seedling breeding: whether on land or cold shed, warm shed seedlings, there is a possibility of extremely serious virus disease, from the current grasp of the actual situation, the occurrence of virus disease is widespread, whether it is detoxified potato seeds or ordinary potato seeds, whether it is tobacco potato, Ji potato, commercial potato, honey potato, Qin potato, dragon potato, Any variety such as watermelon red in different regions have yellowing curl leaf (leaf rolling) virus disease (some are dominant for curl leaves, recessive for yellowing, some are opposite, some are dominant at the same time) and leaflets, dwarfing, atrophy, wrinkles, greening, stiff seedlings (frost damage and pesticide damage can also be good) and other different situations will occur at the same time, from the beginning of less than 3%-5% of individual plants with the impermanence of the weather cold and warm changes in just a few days to break out rapidly, the parietal leaves almost stopped growing, these are its main characteristics.

Hello! Sweet potato leaves rolled, red spots on the stem, there may be leaf rollers, sweet potato moth, Spodoptera litura, etc., can be used dimethoate, dichlorvos and pine and other insecticides, according to the normal medication instructions, spray in the afternoon.

There may be two reasons for the appearance of leaf curling disease in sweet potato seedlings: 1. Sweet potato leaf curling virus disease. Sweet potato leaf curling virus disease is a viral disease caused by sweet potato pinnate mottle virus, after the virus infects sweet potato, there are many symptoms, the most common symptoms are:

Greening fade, flowering leaves, shrinkage, yellowing, leaf curling and potato nut cracking, among which the leaf curling type is manifested as the edge of the sweet potato leaf is rolled up, and the leaf is rolled into a cup when the disease is severe. Sweet potato pinnate mottle virus disease is transmitted by insects such as whiteflies and thrips, in sweet potato production, the propagation method used is tuber, seedling propagation, virus seed potatoes in the seedling process, easy to spread the virus to sweet potato seedlings, therefore, in order to prevent the spread of viral disease, detoxified seedlings should be used in production; When raising seedlings, attention should be paid to the prevention and control of whitefly, thrips and other poison-carrying insects; It is necessary to strengthen the field management of sweet potatoes, uproot the diseased plants in time, and replant them with strong potato seedlings. Once a viral disease occurs in sweet potatoes, there is almost no cure, resulting in a serious reduction in yield.

Sweet potato virus disease causes the sweet potato tuber to crack and lose its commercial value. 2. Sweet potato wheat moth larvae. The larvae of sweet potato and wheat moth are mainly harmful to sweet potatoes and water spinach, and the young larvae mainly feed on the young leaves and buds of sweet potatoes, and begin to eat the mesophyll of sweet potatoes after the third instar, and roll up the potato leaves, hide them in the leaves and continue to cause damage.

The sweet potato leaf curl caused by the sweet potato wheat moth is different from the leaf curl caused by viral diseases, and the sweet potato wheat moth rolls the potato leaves into a trumpet shape, gnaws the potato leaves from the inside, and excretes feces. When the occurrence of sweet potato wheat moth is large, a large number of potato leaves are damaged, causing serious yield reduction. The best time for control is before the larvae hatch to the 2nd instar stage, the control is too late, the larvae are hidden in the potato leaves, and it is difficult to effectively control them

30% Avi. 2000-3000 times of chlorpyramide, 22% perchlorofluorine. thiazis 1500 times liquid, etc.

There are many reasons why sweet potato seedlings roll their leaves, such as: Han's or recruiting insects will play a role in transferring to the hospital, or the root system is not developed, and there will also be such a phenomenon.

If the yellowing and wilting of sweet potato leaves is not very serious, you can cut off the yellow leaves one by one to maintain the permeability of the whole plant. If the yellowing is more serious, take maintenance measures in time.

Watering regularly, each watering to keep the potting soil moist, receive more sunlight every day, and keep warm in a low temperature environment.

It is also possible that sweet potato root rot is a disease.

The seedling emergence rate of infected potatoes is low and the seedlings emerge late, and black-brown lesions appear at the tip or middle of the absorbing roots, which are severe and constantly rotten, and the epidermis of the diseased part is longitudinally cracked and the subcutaneous tissue is present.

Darkened, the underground stem with light disease can send out new roots near the ground, although it can produce potatoes, but the tubers are small, and the rhizomes with heavy disease become black and rotten, causing the dwarf growth of the aboveground plants to be slow, the leaf color gradually turns yellow, and the whole plant dies.

Sweet potato root rot control measures.

1. Crop rotation stubble planting, for the plots with serious root rot all year round, the spraying of chemical agents has poor control effect, and it is necessary to rotate with other crops for more than 3 years to reduce the harm of root rot, such as corn, peanuts, sesame, sorghum and other crops in rotation.

2. There are differences in disease resistance between different varieties, and choosing varieties with strong disease resistance can not only prevent and control root rot, but also prevent other diseases, which is economical and effective. Deep ploughing of the soil and increasing the application of organic fertilizer can reduce the number of pathogens in the tillage layer and increase the disease resistance of sweet potatoes for the plots with serious root rot, so as to prevent and control root rot.

3. For the plots where root rot occurs, after the sweet potato is harvested, the diseased leaves, diseased plants and weeds that fall in the field should be cleaned out of the field in time to reduce the wintering places where the pathogens inhabit and reduce the number of pathogens in the field.

4. Before sowing sweet potatoes, use root boys to sterilize the seed potato pieces, which can effectively control the occurrence and spread of root rot. In the planting process, for the plants with initial root rot, the microbial agent of Trim is applied or irrigated, and the concentration of the agent is determined according to the severity of the root rot of the plant, so as to reduce the harm of the disease.

Leaf curling disease appeared after the emergence of sweet potato seedlings, and it was quickly cured by applying urea fertilizer with gibberellin.

Sweet potato virus disease is one of the common diseases of sweet potato, which begins to occur at the seedling stage of sweet potato, and the disease is more serious after seedling cutting. The typical symptoms of diseased seedlings are: yellowing of leaves, shrinkage, flowering leaves, curling leaves, thinner stems and vines, and obviously weaker growth potential.

After the diseased potato seedlings are inserted in the field, the growth is weak, the yield is low, and the yield is generally reduced by more than 6%. The internal cause of sweet potato virus disease is the virus in seed potatoes, and the external cause is poor climate and cultivation conditions. Therefore, the prevention and control of sweet potato mosaic virus disease needs to be worked on both internally and externally

The first is to update the improved varieties and change to detoxified, anti-toxic (or toxin-resistant) sweet potato varieties. the second is to raise seedlings separately, plant them separately, harvest them separately, and store them separately for detoxified sweet potato seeds; In the growth period of sweet potatoes, it is necessary to strengthen the prevention and control of aphids, whiteflies and other pests that can transmit sweet potato virus diseases, so as to avoid reinfection of detoxified seed potatoes with viruses. Third, farmers who have not replaced improved varieties must choose healthy seed potatoes for seedlings; In the process of seedling raising, the mosaic seedlings are found, and the whole seed potato is pulled out in time; When planting, select strong potato seedlings for planting; After inserting into the field, the diseased seedlings were found to be pulled out in time.

Fourth, through agricultural measures such as fine land preparation, high ridge cultivation, increased potassium fertilizer, balanced fertilization, watering to resist drought, and grass mulching to protect moisture, the cultivation management technology is improved, and the disease resistance of sweet potatoes is enhanced. Fifth, the sweet potato seed potatoes and seedlings are treated with anti-heavy stubble agent "Enyibi", and at the same time, "Virus A", "Virus King", "Bacterial Poison Qing", "83 Anti-Agent", "Virus Ning", "Virus Bike" and other foliar spray assistance to potato seedlings are used to enhance the growth of potato seedlings, reduce the symptoms of virus diseases, inhibit the onset of disease and improve yield.

Summary. Sweet potato leaves should be rolled up with leaf curling insect infestation. At first, the new high-lipid film 50o times liquid spray can be used to kill insects.

If you want to work well, you should do it around 4 p.m. on a sunny day. At the same time, it can also be manually assisted culling, only picking up diseased leaves and then killing. Finally, the debris should be cleaned up in time, and the whole sweet potato orchard should be sprayed to protect the tree to eliminate the source of insects.

If it is not a pest, there is a possibility that the leaves will roll up if the water loss is serious, so you can remedy it by watering in time.

What is the disease of sweet potato leaf rolling, how to **sweet potato, roll the leaves?

Sweet potato leaves should be rolled up with leaf curling insect infestation. At first, the new high-lipid film 50o times liquid spray can be used to kill insects. If you want to work well, you should do it around 4 p.m. on a sunny day.

At the same time, it can also be manually assisted culling, only picking up diseased leaves and then killing. Finally, the residual plants and fallen leaves should be cleaned up in time, and the whole sweet potato orchard should be sprayed with a withered grip to protect the tree to eliminate the source of insects. If it is not a pest, there is a possibility that the leaves will be rolled up if the water loss is serious.

I'm sorry I don't understand, but can you elaborate on that?

1. For insect pests, apply 500 times liquid new high-fat film spray to kill insects, 2. Drought dehydration, watering.

The phenomenon of leaf curling in sweet potatoes is generally caused by the plant's suffering from leaf curling disease and dry soil. Treatment method: If the leaf is curled because of the disease, it can be sprayed with drugs such as new high fat film (500 times the liquid), and if the leaf is curled due to lack of water, it can be watered in time.

Precautions for planting sweet potatoes: Sufficient base fertilizer should be applied before planting, and the supply of fertilizer should be strictly controlled after planting.

1. What is the reason for sweet potato leaf rolls?

1. Suffering from sweet potato leaf curling disease.

1) The plant is harmed by leaf curlers, and when the larvae hatch, they will begin to spin and curl their leaves and suck the mesophyll.

2) Prevention and control methods: spray with new high-lipid film (500 times liquid) and other drugs in the early stage of the disease, and the spraying time should be 4-5 o'clock in the afternoon; manual removal of damaged leaves and burning them; Clean up the fallen leaves of the residual plants in the planting area in time (after pulling out the residual plants, you can spray the "tree protection general" to kill the source of insects), and at the same time clean up the weeds.

2. The soil is relatively arid.

1) Dry weather during the planting process leads to leaf curling due to water loss.

2) Treatment method: watering in time.

2. Precautions for planting sweet potatoes

1. During the planting period, Hengsheng should control the supply of fertilizer (apply foot fertilizer before planting), and ensure the balance of nutrients when fertilizing, and not apply a certain kind of fertilizer.

2. During the planting process, it is necessary to ensure that the sweet potato can receive sufficient light, so as to avoid the yellowing or defoliation of the sweet potato.

3. When sweet potato is in the seedling stage, it should provide it with a lot of water, because it needs more water in the seedling stage, and when it enters the flowering stage, it is necessary to reduce the supply of water, so as not to affect the flowering time and flowering rate of the plant.