Can high temperature simmering shed control root knot nematodes? How?

OK. The correct way to kill nematodes in a high-temperature stuffy shed: (1) Turn the ground:

Before application, the soil is loosened, leveled, and kept moist. (2) High temperature: close all the air outlets in the greenhouse, so that the temperature in the greenhouse rises to 50 degrees and keeps it for more than 6 days.

3) Pesticide application: use the stuffy shed medicine to spray evenly on the surface of the seedbed and let the liquid medicine moisten the soil layer by 4 cm.

To prevent such diseases, the first point is that pesticides should be sprayed regularly, and the second point should be glued and irrigated, which are very important and must be mastered.

Of course, you can, so you need to kill them more, which is a good practice.

1.Selection of disease-free soil seedlings: Cultivating disease-free seedlings is the basis for high yields.

The seedbed is one of the important routes for the transmission of root-knot nematodes. Choose new soil that has not been planted with vegetables, apply fully decomposed organic fertilizer as base fertilizer, pay attention to seedling disinfection, and select robust and disease-free seedlings for planting, these operations can play a better preventive role. Soilless seedlings have been adopted in some parts of the country.

Seedbed disinfection can use avermectin emulsifiable concentrate, diluted 2000-3000 times to spray the soil surface comprehensively and evenly, and then immediately rake into the 15-20cm soil layer, fully mix and sow seeds. Or use an appropriate amount of avermectin granules and mix well with the bottom fertilizer for disinfection. The seedbed prohibits highly toxic products such as phosphine, thiophosphine, aldicarb, etc., and such agents are prone to burning seedlings when they come into contact with the roots of melon and vegetable seedlings.

2.Disease-resistant and disease-resistant varieties are selected, but some disease-resistant and disease-resistant varieties have been promoted in a small area due to their high seeds and low yield.

3.Completely remove the diseased root residue in the shed: remove the diseased plants and diseased root residue in time after the previous stubble is harvested, and pay attention to drying the diseased roots and burning them in a concentrated manner.

4.Deep soil ploughing: Turn the topsoil to a depth of less than 40cm to reduce the occurrence of diseases.

5.Crop rotation: re-diseased fields can be rotated with nematode-resistant vegetables such as onions, garlic and leeks, they have strong resistance to cucumber nematodes, planting these crops can effectively prevent or alleviate the occurrence of nematode disease, reduce the amount of nematodes in the soil, thereby reducing the harm to stubble plants.

6.Use high temperature to kill nematodes: the shed can use the high temperature in summer in the leisure season, dig a ditch and ridge in midsummer, fill the ditch with water, and then cover the mulch film, close the shed, so that the temperature of the soil layer within 30cm reaches 50, keep it for 15-20 days, and kill the nematode under the condition of high temperature anaerobic flooding.

Generally speaking, the longer the mulching time, the better the soil disinfection effect. With the temperature of 20cm deep soil layer reaching 40 hours for a cumulative period of 120 hours, which is equivalent to a sunny day of 30 air temperature for 20 days, the ideal control effect can be achieved.

With cyanamide carbonate, pour a lot of water, and stuffy the shed at high temperature.

Root-knot nematodes mainly damage the root system of crops, and a lot of nodules grow on the root system when infected. When the damage is more serious, the plants on the ground will slowly become very slow to develop, and the leaves will become dull and yellow, which will directly affect the yield of the later fruits. There are also some roots that will rot, causing the plant to die, which is really very harmful.

The prevention and control has high temperature prevention and control, and the high temperature stuffy shed will kill all the bacteria and harmful bacteria in the soil.

Chemical control of avermectin has a fast effect, but there are pesticide residues, and it is easy to produce resistance, and the effect is becoming less and less obvious.

Although the effect of biological control and control line is not as fast as chemical control, there is no pesticide residue.

Root-knot nematodes are the biggest potential threat to the development of solar greenhouses.

The best way to control root-knot nematodes is lime nitrogen flooded mulching high-temperature treated soil and flooded mulching high-temperature treated soil in 54 questions. When planting or planting is approaching, the following methods can be considered for remediation:

1) Sprinkle "Fu Duo" per mu with 10% thiazolphosphine (trade name "Fu Duo") kg, mix 40 50 kg of fine soil, fertilize the ground evenly after land preparation, and turn 15 20 cm deep. It is also possible to sprinkle the medicinal soil directly into the planting ditch or planting hole, and plant immediately after mixing with the soil. The prevention effect can reach 90%, and the effective period is one month.

2) Avermectin prevention and control.

On the basis of fertilization and land preparation, 400 500 ml of acetodigin (avermectin) emulsifiable concentrate is used per mu, mixed with 25 kg of fine sand, evenly spread on the ground, turned 8 12 cm shallowly, and then flattened. When sowing or planting, 80 100 grams of soil inoculant should be used per mu, mixed with 25 kg of fine soil, and sprinkled into the planting hole or ditch. After planting, 80% dichlorvos emulsifiable concentrate 800 1000 times solution, 250 ml per hole (plant) watered.

This method can maintain a short-term cultivation of a stubble without nematode damage, overwintering a large stubble cultivation, must be in February of the following year, and then with a mixture of 3000 times of oxytodicarin and 80% dichlorvos emulsifiable concentrate 1000 times to irrigate the roots, each plant with 500 ml.

Ligan sand" or avermectin granules (trade name "deworming"), with 3 4 kg per mu to sprinkle planting ditches or holes, has a strong killing effect on adults, larvae and eggs.

Prevention and control methods of root-knot nematodes in greenhouses:

The comprehensive prevention and control of root-knot nematode disease should be carried out in accordance with the principle of "prevention first, prevention and control combined", and the principle of "agricultural prevention and control as the mainstay, supplemented by chemical control".

1. Crop rotation. Reasonable crop rotation can reduce the amount of soil nematodes and reduce the occurrence of diseases, and the effect is more significant if 2-3 years of crop rotation can be implemented. Crop rotation with grasses, as root-knot nematode disease does not occur in grasses. Disease-free soil seedling raising and deep soil ploughing can also effectively prevent and control the occurrence and development of root-knot nematode disease.

2. Strengthen field management.

Thoroughly treat the diseased and residual plants, burn them intensively or bury them deeply, and reduce the number of insect sources. Reasonable fertilization and irrigation can delay the symptomatic manifestations of diseased plants or reduce losses. Deep ploughing before sowing involves turning the nematodes distributed in the topsoil layer deep into the soil through deep ploughing.

The application of organic fertilizer can increase the strength and toughness of the root system, and improve the resistance and tolerance of plants.

3. Flooding and insecticide.

Irrigation was carried out on the seriously diseased field, so that the nematodes suffocated due to lack of oxygen, the water depth was 10-15 cm, and it was maintained for 4 months.

4. Microbial prevention and control.

Using line 8, through the biological + chemical pathway, the use of lavender purple spora and avermectin to kill root-knot nematodes. Regardless of the roots of any crops such as corn, rice, soybeans, potatoes, sugar beets, cucumbers, watermelons, cabbage, radish, tomatoes, peppers, celery, apples, pears, bananas, citrus, kiwifruit, peaches, flowers, etc., the use of line 8 can scientifically and evenly supplement a variety of nutrients to crops, and promote the development of the taproot and lateral roots of crops at the same time.

Hello! Root-knot nematodes must strictly implement the plant protection policy of prevention-based and comprehensive control! In fields with a large number of nematodes, it is recommended to change to insect resistant (tolerant) crops such as grasses, onions, garlic, leeks, peppers, cabbage, cauliflower, etc., or plant aquatic vegetables, which can reduce the occurrence of nematodes.

It is recommended to treat the soil or hole with avi thiazolphos granules or flupromisulfone before sowing, and use avermectin or flupromisulfone or fluopyramide to irrigate the roots in time after the occurrence of treatment!

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