Potato mosaic disease is extremely harmful, what are the symptoms of potato mosaic disease?

The application of locally adapted disease-resistant varieties, especially the latter, can produce high-quality disease-resistant tubers. Choose non-toxic seed potatoes. Summer sowing, two-season planting, alpine planting and shoot tip tissue culture were adopted to avoid high temperature conditions and reduce or avoid the toxicity of seed potatoes.

In the next season, the source of poison at the production site will be mitigated, and cultivation measures will be taken to alleviate the disease. Timely sowing, high ridge cultivation, reasonable irrigation, fertilization, enhance plant disease resistance, alleviate diseases. timely control of toxic pests and reduce the spread of diseases; Remove dodder seeds from the field as early as possible to prevent the spread of disease.

timely prevention and control of toxic pests and reduce the spread of diseases; Remove dodder seeds from the field as early as possible to prevent the spread of disease.

Mosaic disease, as the name suggests, is a disease that harms the leaves, and when potatoes get sick, the leaves are a little wrinkled, and the edges of the leaves seem to start to wrinkle. In the later stage of the disease, the whole plant spreads outward and bends, and the leaves are scattered and shiny. The leaves may fade, and these faded green dots alternate, so it is called mosaic disease.

Mosaic disease stems are mostly infected with the virus, but there is no difference between the virus stem and the normal stem, so the disease is relatively common. Causes, symptoms and preventive measures of potato mosaic disease petals can generally be divided into mosaic disease, leaf spot disease and compound mosaic disease according to the appearance symptoms, and the incidence is different. Mosaic disease usually occurs when the leaves shrank and wrinkle, and green, yellowish spots appear along the veins.

Leaf disease, also known as mid-leaf disease, refers to mottled petals or diamond-shaped leaves with posterior necrosis.

At the onset of the disease, the plants are shriveled, the leaves are small, the leaves are curved downward, the plants are short, usually do not bloom, die early, and have few stems. In general, diseased potato leaves are a little wrinkled, and the edges of the leaves are also corrugated. The whole diseased potato plant spreads outward, and the leaves also glow.

The leaves of the reduced bottle are a little rusty, alternating to form petals. Usually the potato tuber has the virus at this time, but there are no symptoms of attenuation, and there is no difference between a good potato and a good potato from a sensory point of view. How to prevent potato mosaic disease?

The prevention and control methods of potato mosaic disease must be combined with the transmission mode and characteristics of mosaic disease in order to get twice the result with half the effort. When selecting excellent varieties and seeds, sweet potatoes with strong resistance to disease, drought and water and fertilizer should be selected to reduce the risk of infection with petal virus. At the same time, choosing potatoes from large breeding companies not only guarantees quality, but also easily solves the problem if there are seeds.

Sowing seeds in advance at the right time is mainly to avoid high temperatures during the sweet potato setting period and reduce the probability of infection.

Potato leaf blight mainly harms the middle and late stage of leaf penetration, and the lower senescent leaves are mostly the first diseases. Leaf infection begins at the edge of the leaf or near the tip of the leaf, and initially forms greenish-brown necrotic spots, and gradually develops from round to V-shaped gray-brown to reddish-brown necrotic spots, and the wet streaks are not obvious. The plaque extension tends to turn green and yellow, eventually causing the source leaves to wilt, sometimes producing dark brown spots on the mole, the conidia of the pathogen.

Stem tendonitis forms amorphous grayish-brown necrotic spots, and brown particles may be produced in later lesions. Potato leaf blight occurs regularlyThe pathogen can be sclerotia or hyphae and can overwinter in soil and other host residues along with diseased tissues.

It is mainly manifested on the leaves, which have green spots on the leaves, and the whole of the bad leaves is shiny, and there are symptoms of atrophy.

The symptom is yellowing of the leaves, because with this disease, the most obvious symptom is the yellowing of the leaves.

Generally, when potatoes are sick, the leaves will be a little wrinkled, and the edges of the leaves seem to start to become corrugated. In the later stages of the disease, the diseased whole plant spreads outward and bends, and the leaves also spread out and sparkle, and the leaves may have some fading, and these faded green spots alternate, hence the name mosaic disease.

Mainly on the leaves, mottled will occur, and in severe cases, the entire leaf will lose color, the edges of the leaves will be wrinkled, and the leaf stems will be bent.

The weather temperature is very high, and there will be humidity, which can easily lead to diseases, so when planting potatoes, try to create a good environment.

In a humid environment with a particularly high temperature, it is very easy to get sick and can easily cause damage to plants.

Potatoes are a dual-purpose crop for cereals, vegetables, feed and industrial processing materials. Early and late blight are serious diseases of potatoes grown in the field. Because the symptoms of these two diseases are easily confused, it brings certain difficulties to the prevention and treatment work.

Therefore, it is of great significance to correctly distinguish between potato early blight and potato late blight for grassroots agricultural technicians to correctly guide farmers to prevent and control these two potato diseases in the field. 1.Difference between potato early blight and late blight.

Pathogens and symptoms of potato early blight. Potato blight is a fungal disease caused by the tomato blight bacterium of the subphylum plant. Mainly harms the leaf stems.

When the leaves are damaged, they produce round or nearly round black-brown lesions with concentric rings of 3 4 mm in diameter.

When the humidity is high, in the lesions, a black mold layer is produced, and when the disease is severe, the leaves dry and fall off, causing the leaves to burn in the field. The tuber is infected, the lesions are dark brown or dark brown, round or nearly round, the diseased part is slightly concave, the edges are clear, ** light brown spongy, dry rot. Leaf symptoms of potato early blight.

Etiology and symptoms of potato late blight. Potato late blight is also a fungal disease caused by the pathogenic Phytophthora infestan in fat cabbage. Potato late blight occurs mainly on leaves, petioles, stems and tubers.

On leaves, it often appears at the tips and edges of leaves. It starts out as a waterlogged spot and expands quickly when it's wet. There is no clear boundary between lesions and healthy areas.

The edges of the lesions, especially the undersides of the leaves, have white sparse rings of mold.

In severe cases, the lesions extend to the main vein or petioles, causing the leaves to wilt and droop, and finally the whole plant turns black and wet rot. When the weather is dry, the lesions dry out and turn brown without mildew. When potato tubers become sick, they form brown or purple-brown irregular lesions that sink slightly.

The flesh of the potatoes under the lesions showed brown necrosis of different depths. Sick potatoes are susceptible to infection with other germs and have complications that often lead to soft rot due to bacterial infection. Potato nuggets get sick in the field, rot in the field, rot after being infected by germs in the field.

Leaf symptoms of potato late blight. Similarities and differences between the two diseases. Similarities between early and late blight:

The affected parts of the potatoes are the same, the leaves, stems and tubers are damaged, and the lesions are dark brown in color.

In both cases, the lesions develop a mold layer on them when the humidity is high. Both diseases are caused by fungi. When tubers are infected, they all form brown or purple-brown irregular, slightly dimpled lesions.

Difference Between Early Blight and Late Blight: Although both diseases are caused by fungi, the pathogens are different. When the humidity of the lesions is very high, the color of the mold layer is different.

Blight grows in lesions, while Blight grows in lesions. The potato early blight spots had obvious concentric rings, while the potato late blight spots had no concentric rings. The tubers were infected, and the tubers of potato blight disease were light brown spongy dry rot under the skin; However, potato late blight is usually due to bacterial light brown lesion soft rot.

Azoxystrobin, difenoconazole, or trichloroisocyanuric acid, etc., are all good at removing bacterial pests and allowing potatoes to grow well.

Docarb can be sprayed after dilution in a certain proportion, mainly to confirm what kind of drug should be used to confirm the cause.

Pay attention to the use of bio-organic fertilizer, and apply Bedofeng carbon fertilizer per mu when using base fertilizer to improve the soil, which can effectively reduce the occurrence of diseases. Strengthen fertilizer and water management, control the amount of nitrogen fertilizer, and use trace element water-soluble fertilizer for flushing application during the potato expansion period to supplement the nutrients needed by the plant and enhance the disease resistance of the plant.

No matter what kind of potato we have here, adults and children call it artichoke. Because people here love to eat it, it is planted a lot. In the past, it was planted with local varieties, which were relatively small, but now the varieties introduced from other places are very large, and the large ones weigh more than a catty.

On the leaves, small spots of water-soaked yellowing begin to occur, and the center is dark brown to black. There is a circle of white mold on the back of the leaf, and most of the leaves of the plant die in severe cases, turn black and fall off. When the tuber is infected with late blight, it appears as a slightly sunken dark lesion on the skin of the tuber.

Early blight mainly occurs in the seedling stage of potatoes, and it is also harmful after the plant grows up, mainly harming the stems, leaves and stems of the plant, the leaves show irregular black-brown concentric rings, and there are also black concentric rings in the bifurcation of petioles. Late blight occurs in potato, there will be dark small round spots on the leaves in the early stage, the stalks are black, the leaf buds are dry, and in the case of high humidity, there will be gray-white mold layer on the back of the leaves and the junction of the diseased round and healthy stalks on the stem, and the mold layer is not obvious when the weather is dry. Late blight spreads quickly and is very harmful to potatoes.

Late blight, late blight is also known as potato blast. It mainly harms leaf and stem tubers and is a catastrophic potato disease. It is mainly caused by poor drainage, high humidity in the field, excessive application of nitrogen fertilizer, etc., which occurs quickly, spreads quickly, and leads to the death of large areas of plants; It is a bacterial attack that develops from the bottom of the leaf upwards.

The first to develop the disease are the leaves close to the ground, and the leaves turn yellow during the onset period, and the branches shrank and weaken, and they are carried from the stem rotting straight orange to the potato. Prevention and control methods: strengthen ventilation during the growth period, the field should not be too wet, and during the onset period, you can choose to use chunleimycin and Zhongshengmycin for prevention and control.

Can be used pesticides to control, after the seedlings emerge, the selection of imidacloprid, a net two kinds of agents, according to the leaf stem, leaf back, leaf surface of the order of alternate spraying, every 7 10 days spraying. It will first change from the edge of the potato leaf to that brown lump, and then spread little by little until it invades the whole potato. The reverse side of these infested leaves will have white spots, which can be well confirmed.

The leaves are small and wrinkled, there are many spots on the leaves, and the entire branch of the potato spreads outward, which is a symptom of potato mosaic disease.

The main manifestation is that the leaf eggplant jujube slices have a trembling and yellowing situation, and the yield of potatoes continues to decline, and it will also cause the size of potatoes to be very small, and it will also lead to some spots on the leaves.

That is, the leaves have the spots of each acre of Yan Xunming, the shape of the leaves is not very large, and there is a phenomenon of shrinking, and the whole seedling has such a Huai banquet situation in serious cases.

Potato Diseases:Late blight, early blight, cancer, pink crust, dry rot, bacterial wilt, black shin disease, ring rot, scab, soft rot, ring rot.

Main measures:1It is mainly solved from reasonable fertilization, avoiding soil acidification, compaction, etc., and generally reasonable application

Bio-organic fertilizer, medium and trace elements, macro-element fertilizer, etc. 2.Heavy stubble serious plots:

In land preparation, 50% or 80% carbendazim can be used for soil disinfection, and the dosage per mu is 2 packs (400 grams, about 28 yuan packs). 3.Foliar sprays are applied 3-4 times per growing season, and the infection rate of the plants is very low, the plants are strong, and with proper management, the soil-borne diseases are naturally mild.

Potato bacterial diseases mainly infect the stems or tubers of potatoes, which can occur in the seedling stage of potatoes - the late growth stage, the seed potatoes are infected and rot into sticky balls, and the seedlings are generally infected with 15-18cm in height, and the plants are dwarf or the leaves are rolled up, and they turn green and yellow; The tuber infection begins in the umbilicus, and the diseased part is black-brown, and when the humidity is high, the tuber becomes black-brown, rotten and smelly. In order to better prevent and control common potato diseases, farmers should carefully manage the field, observe the growth of potato plants in the field in time, strengthen management during cultivation, maintain ventilation and light transmission in the potato field and reduce the humidity in the field.

Do not eat sprouted potatoes. You can choose some dry environment, do not choose a humid place, it is easy to germinate, which will affect our physical health.

Late blight, black shin disease, viral disease, ring rot, through their respective methods to prevent and control these diseases.

Consider early blight.

It should be anthrax.

Preferably positive**.

When anthracnose is severe, it can cause necrosis and dryness of some plants and cause rhizome rot.

Leaf infection: the leaf color becomes pale at the beginning of the disease, the top leaf is slightly reversed, and then the whole plant wilts, browns and dies.

Underground root infection: the cortical tissue from the ground to the potato nug is decayed and easy to peel off, the lateral roots are partially browned, the mustache is very necrotic, and the diseased plant is easy to pull out.

Stem infection: many small gray spots, and many black granular sclerotia grow in the cavity at the base of the stem.

Control methods: Implement crop rotation; Timely removal of diseased and debris in the field; Strengthen field fertilizer and water management to avoid high temperature and high humidity conditions.

In the early stage of the disease, the following agents can be used for prevention and treatment: azoxystrobin; Difenoconazole, or trichloroisocyanuric acid.