What medicine is used for tomato root knot nematode? What to do if tomato seedlings get root knot ne

As for what medicine to use to control tomato root-knot nematode, I recommend using Yinghui threadicide. Before crop sowing or transplanting, the control effect lasts for up to 2-3 months with avermectin granules such as Ligan sand and wireless in Yinghui wire killer, hole application or whole field spreading; If the crop is damaged by tomato root-knot nematodes during the growth period, it can be irrigated with blue root sand mixed with water and flushed. It has a good control effect on tomato root-knot nematode.

Tomato root-knot nematode disease mainly harms the roots of plants, mostly occurring on fibrous roots or lateral roots, making the roots appear swollen and deformed, in the shape of chicken claws, and milky white nematodes can be seen buried in the roots. The upper part of the plant is characterized by stunted growth, yellowing of leaves, dwarf plants, few and small fruits, low yield and poor quality.

In times of drought, diseased plants tend to wilt until the whole branch dies. 2. Pathogenesis: The pathogen is southern root-knot nematode, which overwinters in the soil with 2-3 instar larvae or eggs with diseased residues, and spreads through diseased soil, diseased residues, and diseased seedlings with fertilization, irrigation and agricultural operations.

Root-knot nematodes are generally harmed in the soil layer above 30 cm, and the soil layer of 5-20 cm is the most distributed. It is seriously harmful in the plots with high and dry terrain, loose soil, appropriate humidity and low salinity. The disease is severe in multi-year continuous cropping plots.

According to the investigation, the initial infection of tomato root-knot nematode disease in Angezhuang Town, this county may be the diseased seedling soil of the peanut field.

Improve soil microbial flora, effectively prevent the occurrence of nematodes, enhance growth, and reduce the harm of root-knot nematodes. Scientifically and balancedly supplement a variety of nutrients to crops, promote the robust development of the taproot and lateral roots of crops at the same time, and effectively inhibit harmful bacteria in the soil, so that the root parts of crops can play a good role in comprehensive disease prevention and disease resistance.

What medicine is used for tomato root-knot nematode? If it's a nematode. Just as you can use some Chu Chu Na, such as dazolitis can be used.

Tomato root nematodes should be treated with ah, herbicides.

1. For tomato plots with serious root-knot nematodes, take 1 kg of bacillus, first dilute and soak with three to five liters of water for more than 12 hours to ensure that the effective substances are decomposed from the carrier into water, and the roots can be diluted after adding 150 liters of water.

2. 15 days before tomato sowing or planting, select 10% thiazolephos granules, turn deep into the soil after sprinkling, and use 3 to 5 kg per mu, or use strip or ditch application, open a ditch in the middle before planting, apply 2 to kg of the above agent per mu, and then cover the soil steadily, form a medicine belt, if the use of holes, 1 to 2 kg of the above agent per mu, after application, attention should be paid to mixing soil to prevent and control plant roots and direct contact with the agent.

Use nematode crack to apply in the hole before planting, and use 160-200g per mu, that is, the package can be. It is especially reminded that nematodes can only be prevented, and once the disease occurs on a large area of crops, no medicine can cure it. Therefore, it is recommended that even if the nematode has not been found, it is also advisable to use the nematode crack hole to prevent it, and use 40-50g bags per mu.

Tomato root-knot nematode is a particularly common pest and disease, which should be prevented in advance from the beginning of planting, especially in the field of heavy cropping.

1. Planting: 150-300 times dilution of R. solanacearum + 100-150 times dilution of Diliwang + 2 g of Penicillium lilac dipped in roots or bubble trays for planting;

2. Irrigation of seedling water for the first time: 5-10 bottles of Diliwang mu + 10 g mu of Penicillium lavender are irrigated together.

3. The second irrigation: 1-3 bottles of R. solanacium Rick 4. Seedling spray: R. solanacillum Rick 300 times + Wofonsu 600 times dilution spray must be prevented in advance.

The main measures to control tomato root-knot nematode disease are:

First, agricultural prevention and control.

Proper crop rotation. Crop rotation with non-host plants, preferably water-upland rotation for more than 2 to 3 years. Choose disease-free soil for seedlings raising.

Turn the soil deeply. Root-knot nematodes are mostly distributed in the 3 9 cm topsoil layer, and deep turning can reduce the damage. Strengthen field management.

If nematodes occur during the growth of tomatoes, the diseased residues should be thoroughly disposed of, burned or buried deeply; Proper fertilization or irrigation to enhance host resistance.

Second, chemical control.

Apply 1 ml of avermectin per square meter when sowing or planting, dilute it with a small amount of water and spray it on the ground when using it, and immediately turn it into the soil.

Tomato root-knot nematodes mainly infect tomato roots, especially lateral roots. His typical symptom is that the infested root grows into a typical root knot, with many near-globular nodules forming on the root, and the diameter of the affected root can be twice or more than that of a healthy root. If the nematode infestations several times in a row, the root surface will be rough and rod-shaped.

The root surface is white at first, but gradually turns brown or black. Because the root is destroyed, affecting the normal absorption function of the plant, so the growth and development of the aboveground part is hindered, the greenhouse with light disease, the symptoms are generally not obvious, the growth of the heavy disease is slow, the plant is relatively short, the leaves are yellow, the growth is malfunctional, the fruit is small and few, when the temperature is high at noon, the aboveground plant is wilted; In the morning and evening, when the temperature is low or when there is sufficient watering, the temporary wilting can return to normal. As the disease progresses, the plant gradually dies.

Root-knot nematode disease severely reduces the quality and yield of tomatoes. So be sure to get our attention.

Pharmacological prevention. Planting: 150-300 times dilution of R. soccertium ricotium + 100-150 times dilution of Diliwang + 2 g of Penicillium lilac dipped in roots or bubble trays for planting;

The first irrigation of seedling water: 5-10 bottles of Diliwang mu + 10 g mu of Penicillium lavender were irrigated together.

Second irrigation: 1-3 bottles of green lik acre irrigation.

Seedling spray: R. solanacearum 300 times + Wofon 600 times dilution spray.

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.

After planting, the agent irrigates the roots: for the onset of the disease during the growth period, 1500 times of 48% Lesben EC can be used; 50% phosphine fibre concentrate 1500 times; 80% dichlorvos emulsion or 90% crystalline trichlorfon 800 1000 times liquid irrigation root, 200 250 ml of liquid per plant.

Prevention and control methods.

1.Clean the fields, collect pathogens with root-knot nematodes, and bury them deep or burn them down. 2.

Severely diseased areas can be rotated for 2 to 3 years with nematode-tolerant leeks, green onions, peppers, etc. The water-upland rotation is more effective. 3.

The application of fully decomposed organic fertilizer, especially to increase the use of microbial fertilizer, generally per mu concentrated use (furrow or hole application) microbial agent 30 40 kg, can reduce the harm of root-knot nematodes. 4.Medication is administered.

Through our experiments in Shouguang, Liaocheng and Jiyang, before the tomato is subdued, 320 480 kg of avermectin organic fertilizer or gram maggot organic fertilizer per mu is selected as base fertilizer, and in the tomato fruiting period, it is applied 2 3 times, each time 40 80 kg per mu, which has a very obvious effect on the control of root-knot nematodes. When using chemical pesticides to control root-knot nematodes, do not use highly toxic and high-residue pesticides. If necessary, avermectin or afudin 1500 3000 times can be used to irrigate the roots.

You can try Huaxin Farmers (Beijing) Agricultural Science and Technology **** launched a special drug specializing in nematodes "Tukang Powder", "Soil Mother Source" and "Soil Yuan Powder", this product is developed by the Institute of Biology of the Academy of Sciences, with a safety factor of 100%, no root burning, no damage to seedlings, no residue, and beneficial soil.

Tomato is a vegetable with high multiple cropping index, and long-term continuous cropping and heavy cropping are easy to cause tomato root-knot nematode disease, which is caused by root-knot nematode infecting the roots of tomatoes, and root-knot nematodes will use sharp needles to puncture tomatoes when they invade tomatoes, causing mechanical damage, and a large number of pathogens infect crops through the "wounds". At the same time, the exudates (saliva) of root-knot nematodes will produce chemical effects after entering the root tissues, causing the roots to form nodules, hindering the absorption of nutrients and water by the roots, resulting in poor growth of aboveground plants and reduced tomato yield and quality.

As for how to prevent and control it, it is recommended that vegetable farmers use a combination of agricultural, physical and chemical control methods in order to achieve the best control effect. Specific measures include the following: selection of disease-resistant varieties and raising seedlings in disease-free soils; Before planting, the soil should be deeply ploughed, and slaked lime should be sprinkled to disinfect the soil before sowing; Crop rotation and stubble, if conditions permit, it is recommended to carry out water-drought rotation in re-diseased field areas; Strengthen field management, increase the application of organic fertilizer, increase the content of organic matter in the soil, promote the growth of new roots of crops, and enhance the disease resistance of plants.

In terms of pesticides, it is recommended that vegetable farmers choose Yinghui threadicide.

Vegetable farmers only need to apply avermectin granules such as Ligan sand and wireless in Yinghui threadicide in furrow, hole or whole field before crop sowing or transplanting, and the control effect can last for up to 2-3 months; If the crop is damaged by tomato root-knot nematode during the growth period, it can be irrigated with blue root sand mixed with water and flushed.

Tomato root-knot nematode disease is a very common tomato disease, after the nematode invades the tomato root, the fibrous root and the lateral root form a hypertrophic malformed nodule knot, and a new root can be regenerated on the nodule knot, the nematode invades again, forming a root-knot tumor, the plant growth is hindered, the plant is short, the fruit is less, and the plant is wilted and even died. Dissecting the root knot reveals a very small milky nematode.

Penicillium lavender is an endoparasitic fungus, which is an important natural enemy of some plant parasitic nematodes, which can parasitize eggs, and can also infect larvae and females, which can significantly reduce the harm of plant nematode diseases such as root-knot nematodes, cyst nematodes, stem nematodes and other crop root-knot nematodes.

Lebeifeng] water-soluble penicillium lilac biopesticide is a biological control agent developed for tomato root-knot nematode disease, and the new type of tomato root-knot nematode disease control agent has the characteristics of rapid reproduction, strong vitality, safety and non-toxicity; Penicillium lavender secretes and synthesizes a variety of organic acids, enzymes, physiologically active substances, etc.

Expert answers.

1) Tomato root-knot nematode symptoms show that tomato root-knot nematode mainly harms the underground roots of plants, and fibrous roots and lateral roots are particularly seriously damaged. The diseased root is swollen and boil-like, and the vegetable farmers commonly call it "sweet potato", which is yellowish-white at first, then yellowish-brown to black-brown, and finally rots. There were no obvious symptoms in the early stage of the shoots of the diseased plants, and only when the root absorption and induction functions were seriously damaged, the leaves turned yellow and even wilted and died.

The appearance of root disease is asymptomatic, such as the appearance of furuncularoid neomatous milky white and nearly transparent pear-shaped granules (female nematode body) can be corroborated by the diagnosis.

2) The pathogen is plant parasitic root-knot nematodes, which are common in southern root-knot nematodes, and Java root-knot nematodes. The eggs or 2nd infect larvae of pathogenic nematodes survive and overwinter with the diseased residue left in the soil. It can be transmitted with the help of diseased seedlings, diseased soil, irrigation water, agricultural tools, and human and animal activities.

The larvae hatched from the eggs are the infecting larvae of the second instar, which mostly invade from the root apex after touching the host root and settle in the root tissue.

3) Prevention and control methods: reasonable crop rotation. Conditional implementation of water and drought rotation, with onions, garlic leeks or grass crops, or with susceptible but lightly damaged fast-growing vegetables, in order to reduce the amount of nematodes in the soil, control the disease or alleviate the disease.

Seedlings are raised with disease-free soil. Seedlings are raised with grass or paddy soil or seedbed soil disinfection to cultivate disease-free and strong seedlings and prevent planting diseased seedlings.

Soil disinfection. Before planting, 1 ml of avermectin EC was used for m2, and 6 kg of water was used to irrigate the roots; or irrigate the roots with 500 800 times of 40% chlorpyrifos EC; Or use 3% chlorazophos granules per 667 meters 24 6 kg, mixed with 50 kg of fine soil sprinkled, furrow or hole application, planted and slowed seedlings and then used avermectin 1000 1500 times solution, every 10 15 days to irrigate the roots 1 2 times, has a better control effect.

Apply fully decomposed organic fertilizer, reasonable irrigation, enhance plant disease resistance, remove weeds in time, and reduce nematode reproduction.

Thoroughly clean the field, after harvesting, the diseased remains will be buried or burned deeply, the soil will be turned deeper than 20 cm, and the soil will be watered thoroughly, so that the nematodes will suffocate and die due to lack of oxygen.

The results suggest that the root-knot nematode mainly harms the roots of plants, and the above-ground symptoms are not obvious, which often cannot attract the attention of vegetable farmers. When there are obvious symptoms in the aboveground part, it is no longer meaningful to carry out prevention and control, and the seeds can only be destroyed and restarted, so the soil should be thoroughly disinfected during the annual fallow season.