How to control soy red spider? How to control carob red spider?

The red spider that harms soybeans is the cotton red spider, commonly known as fire dragon and fire spider. Spider mites occur all over the country, especially in the Huanghuai River Basin and the main soybean producing areas in the north of China, and the damage is more serious in drought years. According to the survey, in recent years, the damage of soybean red spider has risen to the main position, generally reducing soybean yield by 20% to 30%, and severe plots by 70% to 90%.

Spider mites can occur in the whole growth period of soybeans, with adult mites, if mites harm the leaves, mostly on the back of the leaves to form a web, in the web to suck soybean juice, the affected leaves initially appear yellow-white spots, after the leaf surface appears red large patches, the heavy whole leaf curls, fall off, and even stalks. The growth of the affected soybean plants was stunted, dwarfed, the leaves fell early, the pod setting was small, the seed setting rate was low, and the soybean grains became smaller, resulting in the reduction of soybean yield. In July and August, the damage peaked, and the plots with many weeds or sparse plants and poor growth occurred seriously.

Prevention and control methods: >1) Prevention-oriented, agricultural prevention and control methods are adopted. Applying plantar fertilizer, removing weeds in time, irrigating in time during drought, and carrying out water-drought rotation when conditions permit, can reduce the incidence of disease.

2) Chemical control. First of all, it is necessary to strengthen the inspection of insect conditions in the field and control the occurrence stage of point pieces. When it is found that there are sporadic yellow and white spots in the leaves, it should be immediately treated with medication, and you can choose to spray 25% alkyne mite special emulsifiable concentrate 3000 times, or 20% sweep mite net, mite emulsifiable concentrate 2000 times liquid and other sprays, spray 2 or 3 times.

In times of drought, increase the amount of liquid spray; The mobile sprayer with high pressure and strong atomization is selected, and the prevention and control effect is better; Take care to alternate medications to avoid drug resistance.

3) Biological control. You can choose to spray 1500 2000 times of neem EC, or 10% Liuyangmycin EC 1000 2000 times, avermectin EC, Huaguangmycin 400 600 times, and biomimetic pesticide Nongke mite EC 2000 times liquid.

The control of spider mites should be based on agricultural control, and the application of biological control and chemical control should be coordinated. In terms of strategy, we should focus on the occurrence stage of point slices and control the damage to a minimum.

1) Agricultural control.

Clean the countryside. At the end of autumn, the leaves of the field are burned or manure to reduce the overwintering places of spider mites. After the beginning of spring, before planting, remove the residual branches and leaves and weeds in the field and at the edge of the field to eliminate the source of insects that overwinter in the field.

Strengthen field management. Especially in dry weather, pay attention to irrigation and combine fertilization to promote the healthy growth of plants and enhance resistance.

2) Chemical control.

On the basis of strengthening the monitoring of pests and mites in the field, timely selection and treatment should be carried out in the stage of spot occurrence to avoid the outbreak of patches. In recent years, due to the continuous use of chemical pesticides, especially the unreasonable type, concentration and application period of pesticides, leaf mites have developed resistance, and due to a large number of natural enemies, it has become rampant. Therefore, the application of chemical pesticides should pay attention to the rotation of different types of agents, the use of compound synergist agents or some new special agents.

At present, there are many chemical agents that can be used, such as 20% metamidine emulsifiable concentrate 1000 times, 73% alkyne mite emulsifiable concentrate 1000 1500 times, 40% chrysanthemum horse emulsifiable concentrate 2000 3000 times, 25% miteicidal wettable powder 1000 1500 times, 5% fipronidine emulsifiable concentrate 1000 1200 times, bifenthrin emulsifiable concentrate 1500 times, etc.

The red spider on the bean is also known as the bean leaf mite. In August and September, the occurrence is severe, the pest feeds on the young leaves, and the leaves first shrivel and then fall off. At first, the leaf surface loses green and turns white, and then turns red, and the size of the filament mesh on the back of the leaf can directly see the extent and area of occurrence.

1.When the weather is dry, irrigation and fertilization should be applied in time to promote plant growth and inhibit the proliferation of leaf mites. 2.

Use acaricides. It can be sprayed with 20% compound liuyangmycin EC 1000 times or avermectin EC 1500 2000 times, 15% pyridafen EC 3000 times, 20% metamidine EC 2000 times, etc. Spray evenly on the back of the leaves before the pod-setting stage and after the pod is harvested, pay attention to the rotation of drugs, and advocate the use of high-efficiency and low-toxicity biological pesticides.

A large number of pesticides should be sprayed for control, the effect is very obvious, and the influence of these red spiders on soybeans is also very strong, and it is easy to have some pest and disease problems.

Spraying. Because my soybeans are sprayed with pesticides every year, and there have never been spider mites, I should spray pesticides to control them.

Before planting soybeans, you can pour some pesticide into the soybeans, stir well, and then go to the ground.

Pesticides can be sprayed to control it, because pesticides have a good limiting effect on soybean red spiders.