If you want to prevent black root disease in cabbage, what are your tips?

Heart rot is a bacterial disease, Chinese cabbage is also common, mainly from the kohlrabi heart stage began to occur, the most common symptom is that the outer leaves of the diseased plant are wilted, the most obvious at noon on a sunny day, when the outer leaves are flat on the ground, the leaf bulb is generally exposed during the cabbage heart, the lesions generally invade from the wound at the base of the external stem and leaf, the lesions are translucent and water-stained, and then the light brown wet rot, the hand is sticky and slippery, there is a foul smell, sometimes the heart leaves are rotten, and the outside looks normal together. Broccoli black root disease, in fact, is a blight, is a fungal disease that is easy to obtain at the seedling stage, and the fungus mainly invades from the broccoli rhizome at the seedling stage, causing the diseased part to turn black or shrink. When exposed to moisture, a white mold will appear in the affected area.

The cabbage root group is distributed in a 50 cm soil layer, with the 30 cm cultivated layer being the densest. The leaves are large and the transpiration is large. It requires a relatively humid cultivation environment, and grows well at 80% 90% air relative humidity, especially for soil moisture.

Cabbage is commonly cultivated in all parts of the north and south of our country. Cabbage is a semi-cold-tolerant vegetable, the growth temperature is 20 24, generally below 16, the growth rate is slow, and when the average temperature exceeds 28, the ball is poor or not balling; It is a long-day plant and likes strong light.

<> cabbage planting management mainly does a good job in pest control, timely fertilization to ensure nutritional requirements, and the product should be harvested in time, otherwise it will lose its value due to the increase in temperature in spring. A new low-cost and high-efficiency high-quality cabbage variety suitable for winter planting in northern China, was selected and bred by the Institute of Crop Varieties in Shanxian County, Shandong. The leaf color is dark green, the ball is firm, the quality is good, and the cold resistance is very strong.

The weight of a single ball is kilograms, and the yield per mu is 5000 kilograms. Generally, 60 square meters of seedbeds can be left in each acre of field. After leveling the seedbed, water all over the bottom water, after the water seeps down, the seeds are mixed with fine soil and sprinkled on the furrow surface, and then covered with fine soil centimeters, generally about 3 days can be seedlings.

To prevent and control the black root disease of cabbage, it is necessary to drain the high furrow, irrigate less, sprinkle many times, appropriately choose fully rotted fertilizer, cover the soil should not be too thick, and sowing should not be too dense. 50% of the seed amount before sowing Fumeishuang and Dyszeb zinc powder seed dressing.

1. Crop rotation with non-cruciferous vegetables for more than 3 years.

2. Before sowing, mix seeds with 50% Fumeibi or 65% zeb zinc wettable powder.

3. The seedbed is selected in a place with higher terrain and good drainage, and the disease-free new soil is selected as the seedbed, and the old seedbed should be soiled, mixed with 40% pentachloronitrobenzene powder and 50% Fumei double wettable powder, and 9 10 grams per square meter are mixed into 3 4 kg of fine soil and mixed well, and 1 3 of the medicinal soil is sprinkled on the furrow surface of the bottom water before sowing, and then the remaining medicinal soil is covered with seeds after sowing.

4. Apply decomposed manure, sowing should not be too dense, covering the soil should not be too thick, strengthen field management after planting, timely drainage, and timely pull out diseased seedlings.

5. Pharmaceutical prevention and control can be used 20% methyl phosphorus 1000 times solution, or 60% Duofu 500 times solution, or 75% chlorothalonil 600 times solution, or cupramia mixture 400 times liquid or 50% promethanin wettable powder 1200 times liquid, or 45% Tekeduo suspension 1000 times liquid, etc., 7 10 days 1 time, spray 2 3 times.

The seedbed soil should be mixed with quintozene and Fumei in equal amounts, and 10 grams per square meter should be mixed with 3-4 kg of dry fine soil to disinfect the seedbed soil.

Apply decomposed manure, sowing should not be too dense, and the covering soil should not be too thick.

Hello dear and happy to serve you! Here for you to find out: comprehensive control measures for cabbage wilt:

1. Preferred varieties with high resistance.

The selection of varieties with high resistance to cabbage wilt is the most effective measure to prevent and control diseases, and varieties with strong resistance such as Baihui, Midoritaro, Zhenqi, Xia Qiang, Zhonggan 18 and Zhonggan 96 can be selected in the selection of varieties.

2. Cultivate disease-free and strong seedlings.

When cultivating seedlings, it is necessary to choose disease-free soil crop cultivation soil, use 50 carbendazim (according to the amount of use) and Shile (according to the amount of 3 use) for coating treatment on the seeds, and select the plots that have not occurred in recent years or have not planted cruciferous crops as seedbeds, and at the same time spray the seedbed with carbendazim, methyl tobuzin, blighterin and other drugs for soil disinfection, cultivate disease-free and insect-free strong seedlings, which can reduce the incidence of cabbage wilt.

3. Rotation planting.

Rotation planting is also an effective measure to prevent and control field pests and diseases, in the prevention and control of cabbage wilt, you can choose to plant in rotation with Cucurbitaceae, Solanaceae and other crops that are not cruciferous, and the rotation period should be more than 3 years, which can effectively reduce the accumulation of wilt bacteria in the soil and reduce the morbidity.

4. Avoid planting during the peak period of the disease.

Sowing at the time when cabbage wilt is prone to epidemic disease, the incidence of cabbage is relatively high, and when planting, it can be appropriately sown or transplanted in advance or delayed according to local climatic conditions, and the peak period of disease incidence can also play a good role in disease prevention. The high incidence period of cabbage wilt is generally from June to September, and it should be avoided when transplanting; In addition, for sown cabbage, spring cabbage can be sown early, while autumn cabbage is best sown late.

5. Strengthen field management.

In field management, on the one hand, before sowing, the dead branches and leaves of the previous crops, diseased plants and diseased bodies should be cleaned out of the garden for centralized incineration to reduce the number of parasitic overwintering pathogen spores in the field, on the other hand, it is necessary to carry out moderate squatting seedlings in time, and on the other hand, cabbage wilt is easy to develop in the environment below 17 degrees and above 35 degrees, so in the case of high temperature and drought years or weather, it is necessary to water the field frequently to cool down in the field.

I hope mine can help you, and I wish you a happy life! All the best [happy].

The American spotted submarine fly is a quarantine pest in China, mainly harming eggplant, tomato, potato, pepper, melon, bean, and other vegetables. The larval leaf minus causes the greatest loss to the host plant, destroying chlorophyll and mesophyll cells, causing the plant to significantly delay its development and die, resulting in reduced yield, and the loss of commercial value of the seriously damaged plant, and even the failure of some vegetables and fruits. Prevention and control methods:

Before the 2nd instar of the larvae (the insect passage is very small), spray 2000 3000 times of emulsifiable fudin concentrate, or 800 1000 times of 40% green cabbage and 48% chlorpyrifos emulsifiable concentrate, or 1500 2000 times of 98% Bataan raw powder or 500 times of 25% insecticidal aqueous agent. Different measures should be taken according to the specific local conditions. It is best to alternate the application of different single agents so as not to increase the resistance of the pest.

The commercial preparation of Bacillus thuringiensis can effectively reduce the damage of the American spotted loon fly, and has no killing effect on natural enemies.

Only by knowing the real ** can the symptomatic medication be used. It is mostly a soil problem or a bacterial disease.

Cabbage black rot. When the seedlings are damaged, the cotyledons are soaked in water, and gradually die or spread to the true leaves, so that small black spots or thin black stripes appear on the veins of the true leaves. At the adult stage, the disease is mostly caused by the damage to the leaves, and the pathogen is caused by the invasion of water pores.

Onset, in the form of "V" shaped lesions, invaded from the wound can form amorphous plaques at any part of the leaf. Lesions are light brown, edged.

There is often a yellow halo on the margin, and the leaf veins in the diseased part are necrotic and blackened. The lesions extend to the sides or inward, causing the surrounding mesophyll to turn yellow or die. Sickness.

The fungus can develop along the leaf veins and petioles and spread to the stems and roots, causing the vascular bundles of the stems and roots to become black and rotten, but they are not smelly and dry.

Under dry conditions, the bulb has a black heart or is dry rot, which is different from soft rot.

Cabbage black rot is a worldwide disease that affects cabbage vegetables caused by pathogenic bacteria of the genus Xanthomonas. It mainly damages leaves, but also infringes leaf balls, and can occur in all growth stages.

Black rot control: prevention should be the mainstay, and more disease-resistant cabbage varieties such as Zhonggan 8, Qiugan 1, Qiugan 2 and Qiugan 3 should be used. Crop rotation and stubble, warm soup soaking, and field humidity were used to reduce the incidence of disease.

When the central diseased plant is found, it should be removed in time. In the early stage of the disease, it can be sprayed with 600 times of 14% copper ammonia aqueous solution, or 500 times of 77% copper hydroxide wettable powder, or 500 800 times of 75% chlorothalonil wettable powder, or 1000 times of 40% carbendazim plus sulfur suspension or 4000 times of 72% agricultural streptomycin soluble powder, once every 7 10 days, and sprayed 2 3 times in a row.

1. Symptoms: Cabbage black spot disease mainly harms plant leaves, and mostly occurs on the outer leaves and outer bulbs. In the early stage of infection, small black-brown spots gradually expand, the spot surface has concentric ring patterns, the edge color is darker, the peripheral yellow halo is obvious or not obvious, the spot surface is black mold layer when wet, the diameter of the lesion is 4-l0 mm or larger, and the foliar lesions are dense when severe, and some are connected into plaques, and the surface of the lesions is easy to break or partially fall off into leaf perforations.

The lesions on the petioles are oval or nearly fusiform, slightly concave, and the spots also have concentric rings and long black mold.

Prevention and control methods: 1. Use disease-free seeds, generally the seeds should be disinfected, soaked in 50 warm soup for 30 minutes, dried and sown; 2. Remove diseased leaves in time to reduce the source of bacteria. After harvesting, the fields are cleaned and the soil is turned deeply.

Plots with more serious diseases should be rotated with non-cruciferous vegetables for more than two years;

3. Pay attention to the humidity in the field, do not flood irrigation, and remove the stagnant water in the field after rain;

4. Strengthen agricultural prevention and control. The first is to implement crop rotation with non-cruciferous vegetables for more than 2 years to ensure the infection of the same pathogens. The second is to strengthen seed disinfection.

Soak the seeds in 50 warm water for 25-30min, and then sterilize the seeds with 50% Fumei double wettable powder, and the dosage is the weight of the seeds. The third is soil testing and formula fertilization, pay attention to the effective use of nitrogen, phosphorus and potassium elements, and enhance the disease resistance of vegetable plants. Fourth, high ridge cultivation is used to improve the ability of heat absorption and moisture retention.

Fifth, clean the countryside and drain the water after the rain.

5. Timely drug prevention and treatment. In the early stage of the disease, 64% alum wettable powder, or 75% chlorothalonil wettable powder, or 40% gramshitan wettable powder, or 80% mancozeb wettable powder, or 50% promethane wettable powder, or 50% Lide wettable powder, etc., spray once every 1 week, and continuously control 2-3 times. In order to ensure the prevention and control effect, brassinolide regulator can be added, which can save the drug and achieve the effect of reducing the drug without reducing it for reference.

As Fusarium causes cabbage wilt, it can survive in the soil for many years. Therefore, once a disease occurs in an area, the use of traditional disease prevention and control methods such as crop rotation, seed treatment, fungicide use and removal of diseased plant residues have little effect. Therefore, the use of disease-resistant varieties is currently the most effective way to reduce the loss of cabbage wilt.

In recent years, the Vegetable Research Center of the Beijing Academy of Agriculture and Forestry Sciences has successively cultivated a number of new varieties of cabbage resistant to Fusarium wilt. When the characteristics of blight resistance of cabbage are not understood in the cabbage planting area, it is best to introduce new varieties into the disease nursery for resistance test before planting in a large area, so as to avoid large losses.