The causes of root nematode disease, what to do about root knot nematode disease

Why is there no shortage of all kinds of fertilizer for crops, the longer the lack is, the weaker it is, the leaves are also yellow, and the soil is peeled off, and there are nodules of different sizes on the roots, in fact, this is the harm of root-knot nematodes!

Hazard characteristicsRoot-knot nematode is a highly specialized omnivorous plant pathogenic nematode.

The nematodes known to be harmful to vegetables mainly include high arch root-knot nematode, peanut root-knot nematode, northern root-knot nematode, southern root-knot nematode, Javanese root-knot nematode and beetroot knot nematode. Nematodes have a wide range of hosts, often pesting melons, eggplants, beans and more than 30 kinds of vegetables such as radish, carrots, lettuce, cabbage, etc., and can also transmit some fungal and bacterial diseases.

Root-knot nematodes mainly damage the roots of various vegetables, which are manifested as more lateral roots and fibrous roots than normal, and form spherical or conical white nodules of different sizes on the fibrous roots of young roots, and some are in the shape of rosaries. The aboveground growth of the damaged plant is short, slow, and the leaf color is abnormal, resulting in few fruits, low yield, and even early death of the plant.

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!

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.

Dear, hello, please ask the slag to check the results, the production of root nematodes generally has several aspects. The first is the suitable temperature, the temperature at which the root nematode reproduces and survives is generally the most suitable temperature for the growth of crops. The optimal temperature for crops is 25-30 degrees, which coincides with root nematodes.

This is also a very important reason why nematodes are difficult to control. In addition, modern farming methods are also very suitable for the large-scale propagation and spread of root nematodes. This is because the current farming methods are basically large-scale mechanized modern agriculture.

Therefore, deep tillage and continuous cropping have become the mainstream farming method, which undoubtedly gives a good and rapid production and transmission route for root line and shack insects. Because root nematodes can be produced and spread by running water, wind, diseased residues and diseased soil, diseased seeds and other nutrients, and human activities carried by running water, wind, diseased soil and agricultural machinery.

Summary. Hello dear, the causes of root nematodes are as follows:1

Excessive application of unrotted farm manure, such as chicken manure, cow manure and other acidic fertilizers, will acidify the soil, inhibit the decomposition of organic matter by beneficial microorganisms, and create conditions for the reproduction of root-knot nematodes and the invasion of fruit tree roots. 2.Soil conditionsThe sandy soil texture is loose, the aeration effect is better, the organic matter content is higher, and the species are richer, which provides more suitable soil conditions for root-knot nematodes.

3.A large number of highly toxic pesticides are applied in the soil containing beneficial microorganisms, which are mainly responsible for decomposing organic matter and supplying plant roots to absorb and grow.

Hello dear, the causes of root nematodes are as follows:1Excessive application of unrotted farm manure, such as chicken manure, cow manure and other acidic fertilizers, will acidify the soil, inhibit the decomposition of organic matter by beneficial microorganisms, and create conditions for the reproduction of root-knot nematodes and the invasion of fruit tree roots.

2.Soil conditionsThe sandy soil texture is loose, the aeration effect is better, the organic matter content is higher, and the species are richer, which provides more suitable soil conditions for root-knot nematodes. 3.

The soil of the application of highly toxic pesticides contains beneficial microorganisms, which are mainly responsible for decomposing organic matter and supplying plant roots to absorb and grow, when a large number of highly toxic pesticides are applied, it is not conducive to the survival of fruit trees, resulting in the problem of root-knot nematodes becoming more and more serious.

Precautionary approach 1Varieties are selected from excellent rootstocks, which have outstanding ability to resist root diseases and insect pests, or directly select varieties resistant to root-knot nematodes to prevent root-knot nematodes from the roots. 2.

Spraying of pesticides with false effect and alternating with chemical pesticides can overcome the resistance of pests.

It is best to apply holes, 2-5 kg per mu for prevention, 5-10 kg for treatment, ditch application is also OK, it is best to use it directly with organic fertilizer when transplanting, and the effect can be seen by yourself.

He mainly harms the root system of the crop, 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.