How to cure vegetable rhizobia? What pesticides can be used to cure Chinese cabbage rhizobia

How to ** vegetable rhizobia? I think that if vegetables are more bovine, it should be a relatively common disease in the process of growing vegetables, and the cause of this disease may be that the roots are infected with fungi or something, and no one can give him a little medicine properly.

After the root nodules of vegetables appear, the plants usually have the symptoms of weak growth, dwarf, wilting, accompanied by yellow leaves, similar to lack of water and fertilizer, or blight, root rot and other diseases.

Vegetable root-knot nematode disease, which is also known as vegetable root-knot nematode disease, is becoming more and more serious today, and the general disease will lead to a 25-35% reduction in vegetable yield, and even lead to a dead harvest, which is one of the important obstacles to vegetable production. It can even form cross-infection with microorganisms such as fungi, bacteria, and viruses to aggravate the damage to vegetables **2 for root threads.

1. Clean the countryside and do not litter diseased plants.

2. Adjust the pH of the soil - 100 150 kg of slaked lime per mu 3. Strengthen cultivation management, increase the application of organic fertilizer, and remove water in the field in a timely manner.

4. The fields with high groundwater level should be made into deep ditches and high compartments.

5. Apply calcium cyanamide mixed soil sterilization, 30 60 kg per mu, 10 cm of mixed soil 6, and irrigate the nest

Fill the nest with Jinlei 500 times liquid or Komsa 800 times solution, irrigate once 2 3 days after transplanting, and irrigate again after 10 days, the effect is very good.

Or use the same multiple of the above pesticides before transplanting to soak the seedlings, and then irrigate the nest once 7 to 10 days after transplanting.

Rhizomes are bacterial diseases, try famous pesticides abroad, as long as you go to the pesticide store and ask, someone will tell you what to treat, but you also need to make preparations for prevention and control before planting.

1. Occurrence pattern and symptoms.

Vegetable rhizobia is a disease caused by fungi. The fungus winters and summers in the soil with the diseased roots, invades the host from the young roots or wounds, and spreads through rain, irrigation water and farm tools. Drought years are less likely to occur. The acidic soil is severely diseased, and cruciferous flowers are planted year after year.

Vegetable plots, diseased plots with water heads, and plots with unrotted and diseased residues manure are seriously ill. Tumors of irregular shape and different sizes are formed on the taproot or lateral roots of diseased plants, with smooth tumor surface in the early stage and cracked and rough in the later stage, and it is also easy to be infected with other pathogens and rot, and the growth of the taproot is slow.

Second, prevention and control methods.

1) Crop rotation with non-cruciferous vegetables for more than 5 years. Disease-resistant varieties are used for seeds, and 40% of the weight of the seeds is used

Seed dressing double powder and new high-fat film seed dressing can repel underground pests and diseases, isolate virus infection, do not affect germination and swelling function, strengthen respiration intensity, and improve seed germination rate.

2) Remove the diseased plants and bring them out of the field to burn or bury them deeply.

3) Apply lime to change the pH of the soil, and generally apply lime powder per mu.

75 100 kg, or 15% lime milk at the beginning of the disease.

Irrigate roots, liters per plant. And spray the new high-lipid film in time at the seedling stage to prevent bacterial infection, so that the seedlings can grow strongly.

4) At the beginning of the disease, use 96% "Tianda Evil" powder 3000 times +

Tianda 2116 "1000 times liquid, 60% Baitai dispersible granules 1000 times liquid, 50% carbendazim wettable powder 500 times liquid irrigation roots, liters per plant, or 2 3 liters of 40% pentachloronitrobenzene powder 500 times suspension per mu mixed soil 40 50 kg ditching applied to the ridge.

5) Strengthen management. In the vegetable growth period, timely watering and topdressing, cultivating and weeding, improving the disease resistance of the plant, and timely spraying of strong stems can make the plant stem thick, the leaf hypertrophy, the leaf color is fresh and tender, the plant is lush, and the natural taste is strong. At the same time, it can improve disease resistance, reduce the amount of pesticides and fertilizers, and reduce residual toxicity.

6) It often occurs in acidic soils, plots with high groundwater levels and continuous cropping of cruciferous vegetables. Air temperature and ground temperature between 18 and 25 are most suitable for the onset of the disease. As a result, vegetables sown or planted in August and September are the most affected.

The late growth stage of spring-sown vegetables is the disease occurrence period, so it is not very harmful. When cultivating vegetables in diseased fields, plots that have not been cultivated for at least 5 to 6 years should be chosen. The sowing period should be delayed as much as possible, and the seedbeds and planting plots should be disinfected.

Strengthen field drainage, high furrow cultivation.

Are you talking about the formation of nodules of different sizes on the roots, white, string-like, stunted and deformed roots, slow growth of aboveground plants, yellowing or scorched leaf margins?

This is a disease caused by root-knot nematodes.

Control methods: 1) Select disease-free soil for seedling raising.

2) When transplanting, diseased plants are found to be removed in time.

3) Implement crop rotation with onions, garlic, leeks and other vegetables for more than two years. It is best to rotate with gramineous crops in the severely diseased plots, and the best effect is the water-upland rotation.

4) When the greenhouse is changed in summer, the soil should be ploughed and turned over more than 25 cm, and the fully decomposed organic fertilizer should be applied at the same time; Or replace all the topsoil within 25 cm.

5) After the vegetables are harvested, remove the diseased residual roots in time, bury them deeply or burn them, and eradicate the weeds in the field.

6) In the summer high temperature, sprinkle 5 cm of wheat straw in the greenhouse, and then sprinkle about 100 kg of superphosphate, turn into the ground, cover the mulch, and close the greenhouse, so that the shed temperature is as high as 70 or more, and the temperature in the soil is 10 cm deep as 60, and the shed is closed for 15-20 days.

7) Soil disinfection can be carried out with methyl bromide, 98% must-kill granules, and lime nitrogen.

8) After the onset of the disease, the roots were irrigated with 1500 times of 2% Tianda avermectin EC, and each plant was irrigated with kilograms.

Vegetable root-knot nematode disease is also known as vegetable rhizobia. In today's increasingly serious root-knot nematode disease, the general disease will lead to a 25-35% reduction in vegetable yield, and even lead to a dead harvest in severe cases, which is one of the important obstacles to vegetable production. It can even form cross-infection with microorganisms such as fungi, bacteria, and viruses, and aggravate the harm to vegetables.

**2 According to the law that root nematodes are harmful to vegetables, it can be concluded that generally root nematodes cause mechanical damage by piercing the roots through sharp mouths, and the wounds provide a way for other diseases and bacteria to invade. The root tips on the back side of the crop are injured to form a string of spherical nodules (root nodules), and small fibrous roots are clustered on the root knots. These nodules (root knots) are yellowish-white at first and blackish-brown in the later stages.

This is the cause of rhizobia. Therefore, we need to solve the problem of root nematode damage to the root cause of vegetable rhizobia. It is recommended to irrigate the roots with 800-1500 times of sand emulsifiable concentrate mixed with water, and then use it again at an interval of about 30 days according to the severity of root nematode occurrence and the length of the crop growth period**.

Mainly for the root of sweet and pepper stems and vascular bundles, some branches and leaves of diseased plants become yellow and wilted, vascular bundles in the stem are browned, humidity is high or the base of the stem or rhizome rots in the late growth stage, and after the pepper begins to expand, the stems and leaves of the plant appear wilted, and the whole plant wilts in the later stage.

The disease mostly starts in the epidermis at the base of the stem, and is commonly known as "black stalk" by vegetable farmers, and then the pathogen spreads inward and downward, eventually leading to the death of spicy (sweet) peppers. Longitudinally cut the base of the stem or root, the xylem is water-stained dark brown, and finally the rhizome rots. Under high humidity conditions, the diseased part produces white cotton flocculent mold.

This is an important feature that distinguishes it from sclerotinia sclerotinia disease.