Root knot nematodes are very harmful, how to prevent them reasonably?

Specifically, there is a strong emphasis on the application of microorganisms; The use of nutrients should be scientific and comprehensive; "Nutrition + stress", which opens the secondary metabolism of plants; Use inputs with caution. Nematodes are very harmful, making crops grow short, slow, abnormal leaf color, small fruit, low yield, and even cause plant death. Control methods, remove nodules, dry or burn.

<> the use of pesticides is not standardized, it will cause the ability of root-knot nematode to increase drug resistance, and bring certain difficulties to the prevention and control, after the use of unrotted farm manure and the discovery of root-knot nematode disease, the amount of pesticides used is insufficient, or the use of inferior pesticides, for the prevention and control of root-knot nematodes overwintering in diseased tissues with adults or eggs, or overwintering in the soil with larvae. Diseased soil and diseased fertilizer are the main diseases. The following year, overwintering larvae or eggs hatch into larvae that invade from the roots, resulting in an initial infestation in the field, followed by a subsequent infestation.

Severe disease occurs in drought years when there is little rain and irrigation is not timely. It is severe in loose soils, weak water retention capacity, well-ventilated sandy loam, sandy soils or poor soils. It is mild in alkaline soils with poor air permeability, strong viscosity and low-lying terrain.

The roots should be burned after drying; 3.It can be eradicated by means of fire, soil exposure and high-temperature simmering in the summer season. Root-knot nematodes, prevention before colonization, use avermectin or thiazolphosphine granules ditch application or hole application, melon leafy vegetables pay attention to thiazophosphine.

New chemical agents are often used for a long time and do not have any effect on large root-knot nematodes, resulting in a state of paralysis and dormancy, and when the time is right, they will come out to reproduce. The roots of the damaged crops often form nodules, which hinder the normal nutrient absorption of the crops, causing the leaves to kill the insecticidal eggs. Two biologics are recommended here, one is Penicillium lavender, and the other is bioclochlorim.

Penicillium lavender is a fungal microorganism, which inactivates pathogenic microorganisms bound to root-knot nematodes, but has a short survival time and is unstable. When growing seedlings, we should choose the soil that does not have root-knot nematode disease for seedlings-raising, and the soil with root-knot nematode disease should be disinfected before raising seedlings, and we must ensure that the seedlings are not infected.

Sunlight disinfection, after the fruit is harvested, sunlight can be disinfected, in the hot summer season, ploughing and watering after covering the film, drying for 5-7 days.

The soil disinfection line is warped, which obviously controls and alleviates diseases, so that the root parts of crops play a good role in comprehensive disease prevention and disease resistance.

If this problem is more serious in a piece of land, you can fallow for a period of time, if it is a greenhouse, sprinkle quicklime, and then irrigate it, so that it will produce high temperatures, and then cover it with mulch film to kill pests in the soil. If it is summer, ploughing and then covering the film, using sunlight can also be a good way to kill pests.

This bug will only survive in a dirty environment, as long as the fields are kept clean, they will never breed.

Crop rotation of vegetable fields with root-knot nematodes, and try to implement crop rotation, especially rice and onion, garlic and other crop rotation, the effect of controlling root-knot nematodes is better. Do not rotate with nematode-prone vegetables such as eggplant, tomato, celery, lettuce, carrots and other vegetables.

<> combined with deep ploughing and increasing organic fertilizer, it also has a certain effect on the prevention and control of root-knot nematodes. Planting spicy crops such as garlic, green onions, and onions in the field reduces the occurrence of root-knot nematode disease. About 3 kg of avermectin granules per mu are applied during land preparation or before crop planting, which has a positive effect on the prevention and control of root-knot nematode disease.

The field ridges 30 cm, irrigation and mulching in the ditch, airtight for about 20 days, can use high temperature and flooding to kill insect eggs.

1. Prevention and control methods of root-knot nematodes

1. Plant spicy crops, such as garlic, green onions, onions, etc., these crops emit odors in the ground, and root-knot nematodes will be very unadaptable, which can reduce the occurrence of root-knot nematode disease.

2. Taking advantage of the oxygen-loving characteristics of root-knot nematodes, flooding fields in areas with conditions is carried out for about one month in summer. For the field of the protected land, the ridge can be carried out about 30 cm, and then the ditch can be irrigated, covered with plastic film, sealed for about 20 days, and the high temperature and flooding can also kill the eggs.

3. Generally, root-knot nematodes are harmed by the topsoil layer within 15 cm, which can be deeply turned and combined with deep turning to increase organic fertilizer, which also has a certain effect on the prevention and control of root-knot nematodes.

4. Before crop planting or land preparation, about 3 kg of avermectin granules are applied per mu, which has a positive effect on the prevention and control of root-knot nematode disease.

2. How root-knot nematodes are formed

1. Root-knot nematode disease has a lot to do with the application of unrotted farm fertilizer, which will produce some organic acids after being applied to the soil, such as pig manure, chicken manure, sheep manure, etc. Root-knot nematodes prefer acidic soils, and soil acidification is conducive to the reproduction and expansion of root-knot nematodes.

2. The sandy soil has a heavier disease, and the sandy soil has better air permeability, which is conducive to the growth of the root system, and is also conducive to the reproduction and parasitic damage of root-knot nematodes.

3. The use of pesticides is not standardized, which will increase the ability of root-knot nematode to resist drugs, bring certain difficulties to the prevention and control, and the number of pathogenic bacteria and insect eggs will increase after the use of undecomposed farm fertilizer.

Prevention and control methods 1, agricultural measures.

Use insect-free soil for seedlings to raise. When transplanting, remove the insect-bearing seedlings or remove the "root nodules". Remove the carcass of the insect, reduce the density of the insect population, and burn the roots of the insect after drying.

Turn the soil deeply. Turning the topsoil below 25 cm can reduce the occurrence of insect infestations. Crop rotation for insect control.

In fields where nematodes occur a lot, changing to insect resistant (tolerant) crops such as grasses, onions, garlic, leeks, peppers, cabbage, cauliflower, etc., or planting aquatic vegetables can reduce the occurrence of nematodes. High (low) temperature inhibition insects. Take advantage of the high temperature in summer and the leisure season, ridge irrigation and mulching, and seal the shed for two weeks.

The occurrence of nematodes can be inhibited by using low-temperature freeze in winter.

2. Pharmaceutical prevention and control.

Soil treatment before planting: 10% gram phosphorus, 3% milel, 5% Yishubao and other granules can be selected, and 3 5 kg per mu can be evenly sprinkled and turned into the soil. You can also use one of the above-mentioned agents, 2 4 kg per mu in the ditch application on both sides of the planting line, or with the planting hole application, the amount of medicine per mu is 1 2 kg, and the soil mix after application prevents the root system from being in direct contact with the agent.

1. Agricultural measures.

Use insect-free soil for seedlings to raise. When transplanting, remove the insect-bearing seedlings or remove the "root nodules".

2. Prevention and control of chemical agents.

You can choose 10% gram phosphorus, 3% milel, 5% Yishubao and other granules, 3 5 kg per mu evenly sprinkled and then tillage into the soil.

3. Microbial prevention and control.

4. Electricity prevention and control law.

There is a root-knot nematode bar on the Internet, which is full of treatments and medicines for root-knot nematodes.

It is mainly the improper application of fertilizers that cause pests and diseases. The harm is very large, you should use a plant-specific insecticide, spray evenly on the leaves of the plant, and do not water it during the medication, otherwise it will reduce the efficacy of the drug.