What is the cause of melon leaf blight affecting yield?

Melon leaf blight and melon leaf spot are diseases that are susceptible to infection during the growth period of melon, which can cause serious harm to melons and affect the economic benefits of farmers. Let's take a look at the difference between melon leaf blight and leaf spot, and how to prevent and control it: timely early sowing, early transplanting, early seedlings, early soil cultivation, early fertilization, timely soil cultivation, and cultivation of strong seedlings.

When transplanting seedlings, the nutrient soil of seedlings should be sterile soil, and it should be dried for more than three weeks before use. The sowing date should be scientifically determined, and the average daily temperature should be stable in the open field.

Symptoms: Mainly infect the roots and stems of melons, in the early stage of infection, it is water-soaked, and then rots. The stem shrinkage is not obvious, and the vascular bundles at the decay of the diseased part turn brown and do not develop upward, which is different from blight.

In the later stage, the disease becomes worse and is messy. Small grayish-white to grayish-brown spots in the middle, gradually enlarged to form round or angular brown water-stained lesions, which are easy to perforate after thinning. Lesions can sometimes overlap to form a large, irregularly shaped brown lesion that begins at the edges and gradually spreads throughout the leaf.

After the flood irrigation of the dry farming melon orchard in the south, due to the hard disk at the bottom, the stagnant water cannot be discharged in time, and the lack of oxygen of the melon root can cause a large area of death. After a long period of rain, sudden high temperature and strong sunlight can also cause a large area of melon leaves to dry up acutely. When grafting, the rootstock is too short or planted deeply, so that the seedling interface is closer to the ground or the soil is cultivated above the interface, so that the melon stem and the soil contact grow adventitious roots, and gradually replace the rootstock roots, lose the grafting effect, easy to occur, resulting in plant death.

The root system of melon is well developed, the main root is up to one meter deep, the lateral root distribution diameter is 2-3 meters, the root regeneration is weak, and it is not resistant to transplantation. The growth and development process of melon can be divided into germination stage, seedling stage, vine extension stage and fruiting stage. Melon likes warm heat and is not tolerant to frost, and the cultivation season is limited by frost and accumulated temperature.

The harm of melon leaf spot disease to leaves: At the beginning of the disease, you can see small yellow-brown water-stained lesions on the leaves, and the lesions are small at the beginning and round in shape. As the disease becomes severe, the lesions expand and increase, and the color becomes dark brown, and the leaves look a little shiny.

The disease is caused by fungi. One is the seed carries the pathogen, the second is the residual pathogen in the soil, and the third is spread by air currents, irrigation water, rainwater or the belt during agricultural operations. The disease is mainly caused by the skin of the leaves, the leaves are produced in the early stage of the disease, the leaves are yellowish small lesions, the outer edge is water-stained, with the spread of the disease, the lesions are continuous and cause the leaves to scorch.

The disease usually begins to appear in the late stage of melon setting, usually in the middle and upper leaves. The melon vine is diseased, and the lesions are sunken and gray-brown. The fruit is damaged, the lesions are brown sunken spots, often cracked, and the bacteria can invade the pulp, causing the fruit to rot.

Melon leaf blight mainly harms the leaves of melon, in the early stage of the disease, the leaves of melon will produce small yellow lesions that fade green, the outer edge is water-stained, with the development of the disease, there will be leaf scorching, melon leaf blight mostly begins to appear in the later stage of melon sitting, usually in the middle and upper leaves. When melon vines occur, there will be gray-brown symptoms of depression in the lesions, and the fruit will be damaged, and the lesions will be brown and sunken spots, and there are often cracks, resulting in the symptoms of fruit rot. Melon leaf blight This disease is caused by a fungus.

First, the seeds carry pathogens; the second is the residual pathogens in the soil; third, the germs are spread by wind and rain; Fourth, when the temperature is above 32 and the relative humidity is above 90%, it is easy to induce disease; Fifth, melons with poor drainage, excessive density, and partial nitrogen fertilizer.

In the melon orchard, there are often yellow round lesions, which are dry or even wilted; Some petioles also appear light brown, water-soaked slightly sunken narrow lesions, which can be sad for melon farmers, what is the reason for this? Why is this happening with melons all over the ground? In fact, this is caused by melon leaf blight, melon leaf blight, also known as melon spot disease, is often ignored in management, but once several melons are infected and sick, the leaves will quickly wither, and in serious cases, all the leaves in the entire melon field will die, and the sugar content of the fruit will seriously decrease, which is inedible, affecting the commerciality and economic benefits of melon.

In recent years, the tremor disease has generally occurred in all major melon producing areas in China, and it is serious year by year, with a general incidence rate of more than 70%. Therefore, in the management, melon farmers should pay attention to early prevention and control, so as not to affect the quality and yield of melons, and reduce the economic benefits of melon farmers. Agricultural experts suggest that the majority of melon farmers and friends take preventive measures as soon as possible, and can choose Xinke plant protection rotten root dead seedlings 120 or Hamandi yellow leaf dead seedlings 120 for spraying or root irrigation, which has a significant effect on watermelon soil-borne diseases.

Melon is a food that many people like to eat, and it tastes very crisp and sweet. Melons do not have particularly high requirements for the growing environment, so many people can grow melons, but in the process of growing melons, it is easy to be infected with melon leaf blight. Melon leaf blight mainly occurs during planting, and mainly harms the leaves, causing a certain loss to the yield of melon, melon leaf blight will cause brown lesions on melon leaves, and the number of lesions is many, and in severe cases, it will also lead to leaf death.

Symptoms of melon leaf blight The fungus of melon leaf blight can survive in the soil for more than 15 months, and the pathogen does not have too strict requirements for temperature, the temperature is 14 36, and the relative humidity is higher than 80% to cause the disease, and the disease can also be spread by wind and rain. Once infected, the bacteria will produce small brownish-green yellow spots on the leaves of the melon, which will later turn into brown lesions as the disease worsens, and there will also be a little bump. The top shift is very small and numerous, usually with more than 300 blades per leaf.

And this fungus can also invade the melon, causing the melon to rot. <>

The factors for the incidence of melon leaf blight are generally when the soil of the planting field is acidic and the soil quality is poor, and the lack of fertility will lead to the weakening of the resistance of the melon and the disease is more susceptible. However, if too much forest shirt consumes nitrogen fertilizer, it will also lead to a decrease in the resistance of melons. When the external environment reaches a suitable temperature and the phase humidity is high, melon leaf blight is prone to occur.

So pay attention to drainage during the planting process. <>

Prevention of melon leaf blightFarmers should choose disease-resistant varieties before planting melons, because the seeds of disease-resistant varieties will have strong resistance to pathogens. When cultivating, it is necessary to choose fields with fertile soil and easy irrigation, and do a good job of drainage, especially after heavy rain, to drain water in time to reduce relative humidity. When sowing, it is necessary to pay attention to early sowing, early transplanting, and early fertilization, and to remove weeds in the field in time during the planting process.

Ye Shengming will have yellowing and wilting, and such a noisy situation also indicates that the water is not enough, or there is no timely fertilization of Huai, in this case, such leaf blight will appear.

There are small brown spots, which will slowly expand and become green circles, producing ring patterns, and the leaves will slowly scorch.

First of all, there will be a lot of dark brown spots on the melon, which will also cause the yield of the melon to become lower and lower, and the rhizomes and leaves of the melon will develop later, and the speed of the development of jujube oranges in this rock closure is also relatively slow.

Seed sterilization. Because viral diseases are often carried through planting, if the seeds are not disinfected before planting, then the probability of viral diseases is relatively large, the local disinfection practice is to soak in warm water at 55 degrees Celsius, 20 minutes, after soaking in cold water, buy seeds to formal channels, not greedy for cheap. Don't worry, after buying seeds, disinfect them in time, one of the two is caused by viruses and the other is caused by bacteria, which can be soaked in hot water and disinfected with potassium permanganate solution.

Both diseases can be prevented.

Mosaic disease: Mosaic disease mainly occurs in places with high temperatures, droughts, and too much light. The onset of mosaic disease is manifested as the appearance of mottled mosaic leaves formed by dark green and light green on the page, the onset of mosaic leaves becomes smaller, uneven, melon vines are twisted and atrophied, the plant is short, the growth of melons and fruits is slow, and leaf blight is a cell disease.

It is mainly spread through seeds, so prevention is mainly agricultural prevention. 1. Choose coated seeds, if they are not coated, they must be sterilized with seed dressing agent or soaking agent. 2. Do a good job of drainage during the cultivation process to reduce the humidity in the field, mosaic disease is that there are yellow-green and dark green spots on the leaves at the beginning, the leaves slowly shrink, wrinkle, and become uneven, the whole melon vine has shrunk, and the surface of the melon and fruit is not smooth and spots.

Melon vine blight is a fungal disease called melon coccidiosis by scientific name. This pathogen is mainly parasitic in the provenance or stump leaves, Oak Mountain is very easy to occur in the middle temperature and high humidity season of Gaoliang filial piety, and spread with wind, rain, insects and other carriers, vine blight occurs after melon seedlings, the growth period of melon is the main damage to the base of melon stems, stem nodes and petioles, the branches of the stem base at the beginning of the disease appear water-stained gray-green diamond-shaped and strip-shaped lesions, spread upward to each stem node, and gradually form yellow-white oval depression spots.

Leaf damage: small black-brown spots initially appear, gradually turning into lesions with a diameter of 1-2 cm. The lesions are nearly round black-brown or have concentric lines. The lesions on the leaf margin are arc-shaped, and small black spots appear on the lesions. The diseased leaves are dried and the lesions are stellate and cracked.

We can see if there are some small yellow spots on the page of spring deficiency, and the slow bulge will stretch the whole plant, so that the whole plant will become yellow, and there are some gray-brown lesions on the fruit, which will rot in severe cases.

It is that its leaves have some uneven brown spots, and they will protrude, and slowly these germs will corrode into the melon, causing the melon to rot.

It depends on the condition of the leaves, if the leaves are in a state of wilting, or if they look like they are wilting, it means that they are suffering from such a disease.

In this case, it is necessary to replace the early soil, you should choose some organic matter of the soil spring teaser or, and in the early stage of growth, you should go to fertilization, do not overdo it when pruning, you can spray some pesticides on the page.

Summary. Little by little, it began to wither, and slowly spread, until the whole thing died.

Melon wilt disease, also known as wilting disease, vine cutting disease, commonly known as dead seedling disease, is a disease that occurs on melons caused by the specialized infection of melons by Fusarium acumensis. Melon wilt is a typical soil fungus disease, and the typical symptom is wilting. It can occur in the growth period of the whole hall of the plant, but the disease is most serious in the flowering and fruit-setting stage, and the common branch causes the withering and death of the melon seedlings.

Blight. Little by little, it began to wither, and slowly spread, until the whole thing died.