Potato leaf disease affects yield, what medicine should be used for potato leaf infection?

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.

Potato leaves are infected and rhizomes rot, which is a lack of nutrients that leads to a decrease in resistance, and it is necessary to supplement potatoes with sufficient nutrients to prevent and control them.

1. Do a good job in seed treatment to prevent bacterial infection.

When cutting seeds, use root peptide seed dressing, sterilization king cutter sterilization or small potato whole potato sowing, if you find diseased potatoes, do not continue to use them, reduce the probability of seed potato infection; When sowing, reserve the machine passage to avoid wound invasion, and the humidity in the field should not be too large.

2. Do a good job of field inspection and pay attention to the inspection time.

The best time for growers to visit the field is in the afternoon on hot days, and it is better not to do it at the same time every day to find diseased plants.

3. Farming precautions.

After the bean tuber is found to be rotten, the diseased seedlings should be cut off in time and buried deep outside the field to prevent the spread of the virus. In the usual bean cultivation process, attention should be paid to timely cultivation, so as not to rot through the rain into the underground tubers, causing harm to the tubers. Strengthen drainage management, timely sowing, and ensure normal nutrient absorption.

At the same time, it is necessary to pay attention to the quality of the bean seed potato and cut off the source of disease from the seed potato.

In the early stage of the disease, it is necessary to prevent pests and diseases in time, apply fertilizer in time, and pay attention to the management of temperature and humidity.

It should be topdressed in time, but also pay attention to the amount of watering, but also to control the temperature, at the same time be sure to ventilate regularly, but also pay attention to the density of planting.

When planting, the seeds should be disinfected first, and fertile soil with good air permeability should also be selected when planting, and then water and fertilizer management should also be done during planting, and more potassium and nitrogen fertilizers should be applied

Seeds are sterilized before planting potatoes.

Scientific fertilization, prevention as the mainstay, comprehensive treatment.

Strengthen fertilizer and water management to reduce the occurrence of pests and diseases.

Potato leaves are infected with disease, and rhizome rot is disinfected and sterilized with carbendazim.

Choose a more fertile plot for planting, and plant it reasonably densely.

Mosaic disease, as the name suggests, is a disease that harms the leaves, and when potatoes are sick, the leaves will be a little wrinkled, and the edges of the leaves seem to begin 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. Mosaic disease is caused by viruses on most stems, but there is no difference between viral stems and normal stems, so the onset is relatively common.

Causes, symptoms and preventive measures of potato mosaic diseasePetals can generally be divided into mosaic disease, spotted leaf disease and compound mosaic disease according to their appearance symptoms, and their onset is different.

Usually at the onset of mosaic disease, the leaves shrink, wrinkle, and green and light yellow spots appear along the veins. Leaf disease, also known as middle leaf disease, means that there are mottled petals or diamond-shaped leaves on the leaves, the posterior leaf veins are necrotic, and in severe cases, there are brown spots on the stems, and the leaves are wilted and necrotic. Compound mosaic disease is a mixed infection of common mosaic disease and spotted leaf disease, and the plant wrinkles at the onset of the disease, 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, the leaves of diseased potatoes are a little wrinkled, the edges of the leaves are also corrugated, and the whole disease-reduced potato plant spreads outward, and the leaves also shine and shine. The reducer blade is a little rusty, alternating to form petals. Usually at this time, the potato tuber already has the virus, but there are no attenuating symptoms, and there is no sensory difference from good potatoes.

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 achieve twice the result with half the effort. When choosing excellent varieties and selecting seeds, it is necessary to choose sweet potatoes that are resistant to disease, drought, and water and fertilizer, so as 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 can be easily solved if there is a problem with the seeds. Timely and early sowing is mainly to avoid high temperatures during the period when potatoes are bearing sweet potatoes and reduce the probability of infection. Potato leaf blight mainly harms leaves, permeable stems, and most of the lower senescent leaves in the middle and late stages of growth are the first to occur.

Leaf staining begins near the leaf margin or tip, initially forming greenish-brown necrotic spots, and gradually progressing from round to V-shaped gray-brown to reddish-brown large necrotic spots with inconspicuous touches.

The epitaxy often turns greenish-yellow, eventually causing the disease-causing leaves to wilt, sometimes producing dark brown spots on the mole, the conidia of the pathogen. Stemsitis disease forms amorphous gray-brown necrotic spots, and brown particles can be produced in the diseased part in the later stage. Potato leaf blight occurs regularly This bacterium can be sclerotia or hyphae, which overwinters in the soil with diseased tissues and in other host residues.

When the conditions are right, the ground germs are splashed on the leaves or stems through rainwater to cause super-infection, and after the onset of the disease, the sick man produces sclerotia or conidia, which are spread by rainwater and repeatedly infiltrated to spread the disease. Warmth and high humidity are conducive to the occurrence and epidemic of this disease. The disease is more severe in plots with poor soil, poor management, overly tight planting, and weak plant growth.

Potato leaf blight symptoms, potato leaf blight control methods.

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.

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.

When harvesting potatoes, many people have several big bags of allergies, which one has more medicinal use? Also, are such potatoes safe to eat?