How to prevent cucumber root rot? What should I do if the root system of the cucumber plant is yello

Cucumber root rot is a common disease of cucumbers, mainly affecting roots and stems close to the ground. At the beginning of the disease, the roots of the diseased plant are water-stained, and then they are light brown to yellowish brown and rot. On sunny days in the aboveground part, the leaves wilt and droop at noon, and recover in the morning and evening.

After a few days, the leaves do not return to normal and die in a wilt state. After death, the roots completely decay, leaving only filamentous vascular bundles. The base of the stem atrophies, but it 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.

It occurs in various places, and the disease is severe in continuous cropping and low-lying areas. In severe cases, the cucumber dies in patches, and the yield is reduced due to lack of seedlings. Symptoms are mainly root and rhizome damage.

At first, it is water-soaked, and then it is light brown to dark brown rot, but the base of the stem does not shrink, and the browning of the vascular bundles is limited to the rot and does not develop upward, so as to distinguish it from blight. In the later stage of the disease, the diseased part is decomposed, and the tissue separates and only filamentous vascular bundles are left. The aboveground leaves of the diseased plant wilted at noon, and then died because they could not recover.

The pathogen of the disease is Solanum spp., and the pathogen overwinters in the soil with thick wall hugs and mycelium. The fungus is saprophytic and can survive for a long time in the absence of a host. After the spring of the following year, the mycelium that overwintered in the open field developed into a symphytic hussel, which became the primary source of infection, invading humans from the host wound.

The seeds do not carry bacteria, and the main vectors are soil, farm manure, farm tools and running water. A warm and humid environment is conducive to root rot. The growth of pathogens requires a certain humidity, when the air humidity is high and the soil moisture content is high, it is not conducive to the development of cucumber roots, and the plant grows weak and is susceptible to disease.

In addition, heavy soil clay, local water accumulation, continuous cropping, application of unrotted fertilizer, underground pests and root damage caused by agricultural operations will aggravate the occurrence of cucumber root rot. Control measures, reasonable crop rotation, open field can be rotated with cabbage, onions, garlic, etc. for more than 2 years, and the protected land can avoid continuous stubble to reduce soil bacterial content. Strengthen cultivation management:

Remove the diseased plants in time and sprinkle lime in the root holes. <>

Cucumber root rot mainly infects roots and stems, which is water-soaked at first 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 stages, the disease often deteriorates, leaving filamentous vascular bundles.

The initial symptoms of the aboveground part of the diseased plant were not obvious, and the leaves wilted at noon and could recover in the morning and evening. Most of the severe ones could not recover and died. The causative agent of Fusarium root rot is Fusarium spp.

Overwintering on soil and diseased remains, its thick wall spores can survive in the soil for 5 to 6 years. Germs invade from wounds in the roots. When the high temperature is high, it is conducive to the onset of disease, continuous cropping, low-lying land, and soil clay are conducive to the onset of the disease, and the suitable temperature for the onset of the disease is 25.

The pathogen of root rot is Pseudos. stem, which overwinters in the soil with the diseased residues, and can be diseased in 15 30 and severely affected in 20 25. The soil is heavy and permeable, and the plant growth is weak and prone to disease. <>

Cucumber root rot mainly damages roots and stems. The roots are initially waterlogged, then rot and dry out brown, but the base of the stem is not shrunk. The neck is water-soaked at first, the posterior epidermis becomes pale yellow-brown and rotten, and the vascular bundles at the decay become brown and do not develop upward, and the diseased parts are water-decayed in the later stage, and the remaining vascular bundles are silky and numb.

The lower part of the diseased plant has a light leaf color, wilts at noon under strong light, and recovers in the morning and evening. In severe cases, it cannot be recovered, and the diseased part becomes worse, producing pink mold, leaving only filamentous vascular bundles, and dying. High temperature and high humidity are conducive to the onset of disease, and attention should be paid to moisture drainage after watering.

In addition, in the root irrigation agent, the effect of mixing biological fertilizer (foliar fertilizer) is better. Root irrigation agents are available: carbendazim, cantonalin, nailathic agent, carbendazim + fomeishuang and other agents.

Mixed with rooting agents, such as: rooting and seedling strengthening agents, Fengshou No. 1, etc. <>

In the process of fertilization, unrotted organic fertilizer, especially unrotted livestock manure, will release a lot of heat when fermenting in the soil, when the fermentation part is close to the root system or the crop plant is small, the heat generated by fermentation will affect the normal growth of the root system, cause root burning, and in severe cases, it will lead to plant death. Now there are many farmers who use poultry and other manure as organic fertilizer, but sometimes the organic fertilizer is not completely rotted and applied to the ground, at this time, the fertilizer will react again for complete decay, and a large amount of heat will be released, especially the organic fertilizer near the cucumber root system, and the heat will seriously affect the cucumber root system, resulting in root burning.

<> choose a clayey sandy loam soil with pH in between, rich in organic matter, good drainage and irrigation, water and fertilizer retention, avoid continuous cropping with melon crops, and the best stubble is paddy field. The land preparation adopts deep furrow and high furrow, furrow width meter (even ditch), furrow height of 30 cm, north-south direction, double row planting, plant spacing of 30 cm. The roots turn brown and rot, the stems and leaves turn yellow and wilt.

It is mainly due to excessive watering, even cloudy days, cold weather, and low ground temperature caused by "rotten roots".

For cucumbers in sheds, if the soil moisture is not large, it can be used to reduce the concentration of soil solution through watering on sunny days to alleviate the harm, and some functional fertilizers to promote rooting can be applied when watering, so as to speed up the germination of new roots and enhance the growth of seedlings. Pay attention to the watering should not be too large, to water small water frequently, so as not to water too much, resulting in root rooting, aggravating the harm.

Cucumber root rot lesion is not easy to detect in the early stage, the aboveground part is not obvious, once the aboveground part has obvious symptoms, the disease is already very serious, if not timely controlled, it will have a great impact on the production of cucumber. It is necessary to use fermented and rotted organic fertilizer to prevent and control the harm of underground pests and nematodes in time. Balance soil pH, pay attention to soil treatment, soil disinfection, increase soil permeability, and reasonable tillage.

It is mainly caused by the root of the water and the root rot in the later stage. In winter, the ground temperature and humidity are low and the seedlings of large cucumbers are slow, and the production of Chinese vegetable farmers usually water the first water and the second water to follow urgently, which is very easy to cause root rooting and cause the occurrence of root rot. Mitigation Recommendations:

1. Water less, water less, and water the second water reasonably; 2. Rush to apply carbendazim, copper calcium sulfate and other agents to prevent diseases.

1. High-quality seed selection, selecting high-quality varieties, can increase the resistance of cucumbers in advance, prevent the occurrence of root rot, and select and prepare the seedling plots, and sow seeds after soaking treatment. 2. Soil disinfection, disinfection of the soil, can effectively kill the harmful bacteria in the soil, let the cucumber grow in a good soil environment, and is conducive to the improvement of the yield and quality of the cucumber. 3. Strengthen management, strengthen field management, intensively cultivate the land, and carefully cultivate strong seedlings; After planting, it is necessary to water in a timely and appropriate amount according to the temperature change, and at the same time pay attention to the fertility.

4. Biological control, the abuse of pesticides for the prevention and control of root rot may produce pesticide damage, and the prevention and control of root rot can also use microbial agents root boy, Bacillus subtilis can effectively inhibit the growth of harmful bacteria and prevent and control root rot.

It should be watered with more nutrients and fertilizer, so that it can be well relieved and rotten.

Cucumber root rot can be controlled with medicine:

1. 10 days before the onset of the disease, spray or water 1000 times of 50% benfenazim wettable powder, or 800 times of 50% mancozeb wettable powder, or 1000 times of 70% thiophanate-methyl wettable powder, or 500-800 times of 50% carbendazim wettable powder, etc.

2. If the seedlings are found, they should be pulled out immediately, and sprayed with 800 times of 25% methamanine wettable powder, or 500 times of 64% alum wettable powder, or 600 times of 75% chlorothalonil wettable powder, or 200 times of 40% ethylphosphine aluminum wettable powder, or 69% anker manganese zinc 1000 times, or 70% mancozeb wettable powder 500 times, or 15% chlormonyl water 1000 times, etc.

Other prevention and control methods.

1. Reasonable crop rotation, selection of disease-resistant varieties, soaking with new high-fat film before sowing, and conditional rotation with cruciferous and lily crops for more than 3 years.

2. Implement high furrow or deep furrow and narrow furrow cultivation, and frequently clear the ditch and drain to reduce humidity. Strengthen the management of seedlings, after the emergence of seedlings, potassium permanganate plus new high-lipid film can be applied to prevent the occurrence of root rot at the seedling stage, and cooperate with the spraying of new high-lipid film to protect the growth of seedlings.

3. Strengthen management, timely irrigation, especially in the fruiting period, pay more attention to the balance of water**, and strictly prohibit dry and wet. In case of high temperature and drought during the flowering and fruiting period, it is necessary to water in time, and pay attention to drainage after rain in the rainy season to ensure the normal function of the root system.

To sum up, it is about the introduction of the use of cucumber root rot and its prevention and control, and it is very important to apply fertilizer and prevent pests and diseases in a timely manner in the usual planting management!

Prevention and control methods. 1。Agricultural control.

Choose disease-resistant varieties, such as Zhongnong No. 5, Zhongnong No. 9, Chunxiang, Jinchun No. 3, etc. Cucumber seeds are sterilized with 50 warm water for 20 minutes, or 70 dry heat sterilized for 72 hours, and germination and sowing also have a certain effect. It is recommended to use cucumber seed coating No. 9-2, and the dosage is the amount of the active ingredient by the weight of the seeds), that is, 100 grams of seeds can be mixed in milliliters.

The seedbed should be selected in a plot that is sheltered from the wind and sun, and it is required to be conducive to drainage, adjust the temperature of the bed soil, and be conducive to lighting, and increase the ground temperature. If necessary, the nursery bed soil should be renewed, and fully decomposed organic fertilizer should be applied. The hot water circulating hotbed seedling method is adopted.

When the ground temperature drops below 20, start heating the water from the water inlet to supplement the temperature, or you can connect a gas stove or other heat source to make a hot water circulator (welded into an aluminum pot shape with an iron plate), the effect is better. After the emergence of seedlings, the temperature is cooled to facilitate the growth of seedlings, so that the incidence is less and the seedlings emerge quickly. After the seedlings are gathered, the temperature of the seedbed or shed should be kept at 25-30 during the day and 10-15 at night to prevent the invasion of cold currents.

The humidity of the seedbed or shed should not be too high, even if it is rainy or rainy or snowy or the bed soil is not dry, it should be watered less or not watered, and it must be watered with a watering can to avoid excessive humidity. When there are water droplets on the plastic film or glass and seedling leaves, it is necessary to ventilate or remove some plant ash in time to reduce the humidity. The non-drip film cover shed was selected to improve the light conditions and increase the light intensity, so as to facilitate photosynthesis and improve the disease resistance of seedlings.

Carbon dioxide fertilization technology or Huimanfeng multi-compound organic active liquid fertilizer was applied, 320 ml per mu (667 square meters), diluted 500 times, and sprayed twice.

2. Pharmaceutical prevention and control.

10 days before the onset of the disease, spray or water 50% benomyl wettable powder 1000 times, or 50% mancozeb wettable powder 800 times, or 70% thiophanate-methyl wettable powder 1000 times, or 50% carbendazim wettable powder 500-800 times, or 14% copper complex ammonia water 300 times, or 40% aluminum triethylphosphonate wettable powder 500 times, or 70% propylene zinc wettable powder 500-800 times, or 50% Fumei double wettable powder 500-800 times liquid.

Cucumber root rot is one of the common diseases during the growth of cucumbers, which can cause the root rot of cucumbers, which affects the normal growth and development of plants. The occurrence of cucumber root rot is mainly caused by pathogenic bacterial infection in the soil. If measures are not taken in time to prevent and control it, it will cause serious economic losses.

The following are the prevention and control methods of cucumber root rot.

First, the selection of high-quality seedlings.

When planting cucumbers, you should choose healthy, pest-free and high-quality seedlings, which can reduce the occurrence of diseases. At the same time, varieties suitable for local growing conditions should be selected to enhance the disease resistance of plants.

2. Reasonable fertilization.

The occurrence of cucumber root rot is related to the soil environment, and the occurrence of the disease will be caused by insufficient soil fertility or excessive fertilization. Therefore, fertilizer should be applied reasonably according to local soil conditions to avoid excessive fertilization and fertilizer waste, and at the same time, it is necessary to pay attention to the ratio of fertilizer and fertilization time.

3. Crop rotation planting.

Crop rotation is an effective way to control cucumber root rot. When planting cucumbers, care should be taken to rotate with the crops planted in the previous year, which can reduce the number of pathogens in the soil and reduce the occurrence of diseases.

Fourth, moderate watering.

Cucumbers are water-loving plants, but overwatering can cause excessive soil moisture, making it easy for pathogens to grow and multiply. Therefore, watering should be done in moderation and overwatering should be avoided.

5. Prevention and control agents.

For plants that have been infected with cucumber root rot, control agents can be used to control them. At present, the good effect on the market is Zhenzan Agriculture's soil-borne management ab**, which has a good effect on the prevention and control of yellow root rot and dead seedlings! It has won the favor of market users!

6. Disinfect the soil.

Before planting cucumbers, the soil should be disinfected and soil-borne crops should be used for soil sterilization. This can effectively kill the germs in the soil and reduce the occurrence of diseases.

In short, the prevention and control of cucumber root rot requires a comprehensive use of various measures, the most important thing is to disinfect the soil in the early stage of prevention, and then carry out root drenching treatment after planting. At the same time, regular inspections should also be carried out, diseases should be found in time, and disease prevention and control should be done to ensure the normal growth and harvest of cucumbers.