Pea root rot is very harmful, what are the symptoms of pea root rot?

Symptoms, when the apple tree leaves after flowering, causing the main side branches or the leaves of the whole plant, tender shoots die, apple tree rotten root disease, from the spring after the leaf development to September can occur disease tree growth weak, small leaves, light color, slow growth of new shoots, fruit tree planting management, root rot as a common disease of fruit tree roots, often occurs from time to time, the harmful impact of fruit trees is obvious to all, belongs to one of the incurable diseases in fruit tree diseases.

Taking peach trees as an example, peach trees with root rot can bloom normally, but after half a month, the new shoots and leaves suddenly dry out and lose water, and gradually fall off, and then the young fruits fall off. After falling off, the new shoots begin to grow again, and by autumn it is almost impossible to see the root rot of the peach tree itself. Clause.

1. The symptoms of root rot are generally after germination to before fruit set. During this period, the tree begins to draw nutrients from the soil after depleting its own stored nutrients. If you get root rot and can't absorb nutrients from the soil properly, leaflets will appear in the leaves.

When the disease of young trees is severe, it is manifested as small old trees, and the diseased trees have early flowering, large flowering, low fruit setting rate, poor quality, and when the main root and lateral roots are all necrotic, it will lead to the death of the tree. Root rot is a soil-borne disease that is mainly transmitted by soil, water, and underground pests. Root rot is mainly a plant disease caused by fungi, nematodes, and bacteria, and the fungus invades from the rhizome or root wound, and spreads and spreads through rainwater or irrigation water.

Root rot is a disease in the soil, the balance of the environment has been destroyed, the harmful bacteria are far more than the beneficial bacteria, the harmful bacteria act on the plant roots, it will produce root rot, so to solve the root rot, but also to be healthy and no residue, first of all, let's take a look at the root rot symptoms: the damaged seeds become soft, can not germinate, and there is a white mold layer on the surface. After emergence, it damages the roots and stem base of diseased plants, forming brown oval or elongated lesions, and even harming lateral roots.

Soybean root rot, the pathogen is a saprophytic pathogen, which can overwinter normally in the soil or crop disease residues, and becomes the first infection pathogen in the field in the following year.

The roots turn black, the leaves become smaller, etc. Because when peas get root rot, the roots will turn black, the leaves will also turn brown, become smaller in size, and begin to shrunk.

The root will be black and rotten, mainly because of the long-term water accumulation in the roots, so it will lead to such symptoms, so the most important thing to do in daily life is to prevent it.

The rhizome of the pea will turn black in color, and brown lesions will appear on the rhizome, and the leaves of the pea will also turn yellow and eventually dry up, because the nutrients of the pea have been completely lost, which are all symptoms of pea root rot.

The lesions will continue to expand, and the leaves will turn yellow, and at the same time, they will wither, and large areas will die, affecting the yield of peas, and the color of the peas will turn black.

Root rot is a fungal disease, and a variety of pathogenic fungi such as Pythium, Phytophthora and Fusarium may be used as the primary source of infection, infecting crops and causing root rot. Crops that are plagued by root rot will rot their roots and their ability to absorb water and nutrients will gradually weaken. Root rot can be sprayed:

65% zebsen 600 times solution, 50% methyl tobuzin.

1000 times liquid, 75% chlorothalonil.

600 times solution, streptomycin.

300 times the solution, 250 times the root rot net solution, etc., to prevent the root rot of pesticides too much, in the application of the drug with strong characteristics as much as possible. <>

Strengthen cultivation management. Enhance the tree's potential and improve the tree's disease resistance. It is a fundamental measure to prevent and control root rot.

The main method is to deep ploughing and soil maturation. Increase the application of organic fertilizer and phosphorus and potassium fertilizer. Adopt a reasonable pruning technique.

Do a good job of thinning flowers and fruits, and prevent the phenomenon of fruiting in large and small years. Root rot is caused by the fungus Limbospora rot. Pathogens and mycelium, spores or sclerotia overwinter in the soil and on diseased remains.

The spores of the pathogen can survive in the soil for 5-6 years and become the main source of the disease, the bacteria invade from the root wound and then produce conidia in the diseased part.

When sowing, the seeds should be chemically treated and mixed with bactericidal and insecticidal agents. Choose the best seeds and seed coatings. Root rot is mainly caused by seed carriers. Available in 50 carbendazim.

Seed dressing is carried out according to the amount of seeds. Therefore, we must do a good job of prevention and control before the rainy season, after the phenomenon of yellow leaves, immediately use two catties of methyl tobuzin bags with a concentration of 65% with seaweed fertilizer is also two catties, to flush and water the ground, half a month later, the same steps are applied again, and repeated several times.

If we want to effectively prevent it, our farmers can use some physical means to prevent it, such as strengthening seedbed management, covering the soil after seedbed sowing should not be too thick, seedbed sprinkling depends on soil moisture and weather, and the amount of water should not be too much. Do not water around noon in the summer, when the terrain is environmentally sound. The incidence is high in low-lying plots, serious water accumulation, high soil viscosity, and serious soil compaction.

Second, bacterial infection. If there are pathogens in the soil, the pathogens will take advantage of the opportunity to enter when the root system of the plant is damaged or the plant or seedling is emaciated.

Strengthen field management, apply fully decomposed organic fertilizer, appropriately increase phosphorus and potassium fertilizer, improve plant disease resistance, and mix seeds with 30% methamethoxamine 800-1000 times or 30% oxazalin 600-800 times.

This disease can be tried to be prevented and treated with carbendazim, and it is generally effective to spray 2 or 3 times.

You can use methyl phosphorus emulsifiable concentrate, spray this in the early stage, the effect is better.

1. Crops are in an environment of low temperature, high humidity and insufficient light for a long time. 2. Soil compaction and poor air permeability hinder the absorption of nutrients by crop roots. 3. Crops and soil are not sterilized before planting.

The accumulation of harmful bacteria in fruit trees, shed vegetables, open-field vegetables, Chinese medicinal materials and other crops leads to the occurrence of root rot. There are no drainage facilities in the field, and the planting form (flat cropping) is aggravated by water accumulation at the roots of rainy (open crops).

Soil is the survival place of the root system, if the physical and chemical properties of the soil are poor, or even develop to biological degradation, not only the pathogen is more suitable for growth, but the growth of the root system itself will be limited, which is more conducive to the spread of root rot. Root irrigation or flushing in the fieldIt promotes the strong development of the taproot and lateral roots of crops at the same time, effectively inhibits harmful pathogens in the soil, and makes the root parts of crops play a good role in comprehensive disease prevention and disease resistance. It can promote the health of crop roots.

InOrchards with high groundwater levels, dampness, shade, heavy soil stickiness, and poor drainage are more likely to suffer from the disease, intercrops or grasses are luxuriant, causing severe disease in plants with high humidity in the tree tray; 4 June, September and October are rainy seasons, and the disease is severeThe pathogen of soybean root rot is mainly infected by wounds, and plants with injuries or wounds are easily infected. The pathogen generally infects soybean plants when the soil temperature is low and the humidity is high during the soybean sowing period in April.

In the later stage, flush Shi Duoning + Methyl Tobuzin + Shengboan + Aizengmei 500-600 times to irrigate the roots, or small water flushing, ** irrigate once every 7-10 days, and flush once in about half a month in the early stage of prevention. It is necessary to plough in time, level and rake finely, improve soil aeration, and reduce water accumulation in the field. Cultivate the soil in a timely manner to promote root development and control underground pests.

Organic fertilizer should be increased to cultivate strong seedlings and enhance disease resistance. In the spring temperature is low, the soil is heavy in the root rot common area, water a little water in winter, timely drainage in the rainy season, strengthen ventilation to reduce humidity, remove the main branches after the leaves, and continuously fight the fungus and bacteria to prevent the invasion of germs from the wound.

In the face of this situation, it is necessary to prune off the wilted leaves in time, that is, to ensure the right temperature, about 20 degrees, and must do a good job of soil drainage, as well as to ensure the humidity of the soil, and then it is also necessary to water in time, fertilize in time, and spray pesticides in time.

More ventilation, more sunlight, the humidity of the soil should not be too low, the watering should not be too much, the water is enough, there is no need to be too wet.

Some pesticides can be sprayed. Some pesticides are able to **pea root rot.

Diseases or lack of fertilizer cause nutrients that cannot keep up, resulting in stem rot.

Pea seedlings can be cultivated in spring, autumn and winter, sown in March and April in spring, and harvested in May and June.

Generally common are Shanghai pea seedlings, Shangnong pea seedlings, Sichuan pea tip No. 1 and so on, among which the fastest harvest is Sichuan pea, semi-vine, 20 days after sowing can be harvested, 9-10 times in a row, each mu yield of 1000 kg.

The yield of pea seedlings mainly depends on the seedling base, 13-15 kg of seeds per mu, 1500 kg of farm fertilizer before sowing, 100 kg of plant ash, 25 kg of superphosphate, with "Yanwo microbial agent", the effect will be better.

In early spring, 7 days of seedlings emerge, 1-2 times after the emergence of seedlings covered with 2-3 cm. During the seedling period, it is necessary to top dressing and watering in time, keep the soil dry and wet, and weed before sealing. When about 2 true leaves, it is necessary to apply fast-acting nitrogen fertilizer in time, 1 time for each harvest, 4 kg of urea mixed with water, a total of 4-5 times, and top application of potassium dihydrogen phosphate.

Why do pea seedlings rot leaves.

Fungal infections are usually caused by overwatering or a breeding environment that is too wet. Another reason for decay is that the soil medium is not breathable, so it is necessary to use a drainage medium to ensure that the water does not accumulate more than a few points on the stem.

Soybean root rot is a soybean root disease caused by infection with a variety of pathogenic bacteria such as Fusarium, Pythium and S. solizum. It is distributed in some areas of Northeast China and North China, with Northeast China as the main focus.

Symptoms: Damage at the seedling stage, the formation of brown to russet lesions at the base of the stem, oval, elongated or irregularly shaped, concave or not concave, in severe cases, the fibrous roots of soybean are significantly reduced, or die before the seedlings emerge, or the upper part of the root neck is narrowly shrunk after the emergence of the roots, the plants die, and some can see the mold layer.

The pathogen Rhizoctonia soloni kuehn is a fungus belonging to the genus Rhizoctonia sclerotinia spp. The primary hyphae are colorless, multiseptal, the cells are short, branched at right angles, some hyphal cells are enlarged, entangled with each other into sclerotia, irregular shape, brown, dull, scattered or several clusters, and the hyphae are connected between the sclerotia. The sexual generation is Pellicularia Filamentosa (pat

rogers。In addition to soybean, it can also damage sorghum, sugar beet, potato, eggplant and other crops.

Fusarium bulbigenum philum (Srhith) wr] is a fungus and belongs to the genus Fusarium spp. Large conidia lanceolate, colorless and transparent, gradually sharpened at both ends, slightly curved, mostly 3 septums; Small conidia are born in aerial hyphae and are extremely small, oblong, oval, oval, colorless and transparent.

Pathogenesis. The soybean seedling stage is rainy, the soil moisture is high, and the disease occurs severely. In soybean fields with long continuous cropping years, sowing too early and too deep in spring is seriously ill; The disease was severe in plots with heavy soil clay, poor aeration, low organic matter content, and poor fertility. Root pests have wounds, which are conducive to the invasion of pathogens, and the occurrence of diseases is also serious.

Prevention and control methods. 1) Agricultural control. Increase the application of organic fertilizer to promote the growth of seedlings. In the northeast, the sowing depth is 2 3 cm.

Deep cultivation raises the ground temperature and promotes root growth. Ditch drainage to reduce soil moisture. Severely ill areas can be rotated with gramineous crops for 2 to 3 years to reduce the amount of bacteria.

2) Pharmaceutical prevention and control. 50% carbendazim and 50% fumei double are mixed in the ratio of 3 2 to dress the seeds with the amount of seed weight, and 40% seed dressing or phenanthrene can also be used to mix seeds with the amount of seed weight.

Both Funestium rhizophyllum and Hythium ultimate can live saprophytes in the soil, overwintering in the soil with ovipositors and mycelium.

The following spring, when there is sufficient moisture in the soil, sporangia are produced. The sporangia release a large number of zoospores, which penetrate the inferior axis of the seedling cotyledons or the outer cortex of the root after germination, and the disease occurs after latent incubation.

The occurrence of pea root rot is closely related to soil moisture, the pathogen grows well in about 20, the soil temperature is low, and the emergence of seedlings is slow, which is conducive to the invasion of pathogens and is prone to disease.

Poorly drained lower wetlands and clay soil are recurring. The specialized type of nightshade Fusarium pea can invade from fibrous roots and expand to lateral roots and taproots, producing long brown lesions, which shrink the taproot and necrosis the root cortex. The lesion can also extend to the base of the stem, causing the aboveground part to shrink and die.

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