About the pest red spider, what is the red spider pest?

Red spider, also known as cotton red spider, commonly known as big spider, big dragon, sand dragon, etc., is an agricultural pest. The species in China are mainly cinnabar leaf mites, which belong to the arachnida, tick mites and leaf mite families. It is widely distributed and has a miscellaneous diet, which can harm more than 110 kinds of plants.

1) Artificial control Scrape the bark of the overwintering eggs before hatching and burn them intensively, and apply white (lime water) to the trunk after scraping the bark to kill most of the overwintering eggs.

2) Agricultural control According to the law of the hatching of the overwintering eggs of the jujube red spider and the habit of feeding and reproducing on the weeds first after hatching, the ground is turned over in early spring to remove the ground weeds, and there are no weeds in the field during the hatching of the overwintering eggs, so that the red spider dies because it cannot find food.

3) Physical control can be used in the jujube tree germination and jujube spider is about to go up to the tree for damage (about late April), the application of non-toxic non-dry sticky shellac in the trunk of the closed viscose ring, the ring width of about 1 cm, about 2 months and then again, can prevent the jujube red spider from transferring to the tree as a pest, the effect can reach more than 95.

4) Biological control There are many species of jujube red spider in the field, according to the survey, there are mainly Chinese lacewings, mite-eating ladybugs and predatory mites, among which the population of Chinese lacewings is preferred, and the predation amount of jujube red spider is larger, and the protection and increase of the number of natural enemies can enhance its control effect on the population of jujube red spider.

5) Chemical control: The application of 40 dicofol EC 1000 1500 times, 20 mite death net wettable powder 2000 times, 15 pyridafen EC 2000 times, 1 8 zitogenol EC 6000 8000 times can achieve the ideal control effect.

The tropical large-leaved flowers I raise often attract red spiders, dense with small red dots on the back of the leaves; I use ordinary acaricidal pesticides, and the spray insecticidal effect is very good.

They can be eliminated with dimethoate, dicofol or fused scale mites.

This is a leaf mite that carries the leaves of the insects. The control method can refer to the following - in the process of cultivating flowers, red spiders are common destroyers, and the flowers such as Yueji, Milan, jasmine, kumquat, begonia, osmanthus, bergamot and so on are affected. This insect is very small, less than 1 mm, round or oval, orange or reddish-brown, because of its small size is not easy to find, once it is found to be infested, often the flower damage is already relatively heavy.

This insect pest method is to pierce the mouthparts into the leaves and suck the sap, so that the chlorophyll is destroyed, and the leaves appear gray and yellow spots or patches, and the leaves are orange, fall off, and even fall light.

This insect prefers a high temperature and dry environment, so it reproduces rapidly and causes serious damage in high temperature and arid climates. Insects mostly swarm on the back of flower leaves and spin silk nets to cause damage. In addition to crawling on their own, the spread of spider mites is an important way for wind, rain and operation.

To prevent and control red spider damage, Gao Xian should pay attention to observation, and when the leaf color is abnormal, the back of the leaf should be carefully checked, and the individual leaves are damaged, and the insect leaves can be removed; When more leaves occur, it should be sprayed as soon as possible, and the commonly used pesticides are caricato, dicofol, dimethoate, flower insect net, rapid killing, etc. In 400 ml of water, 400 ml of water, 4 drops of mites or quick killings or flower insects can be dropped into 4 drops (equivalent to 2000 times the liquid medicine), with dicofol or dimethoate can be dropped into 8 drops (equivalent to 1000 times the liquid medicine), shake well after adding the medicine, and then spray, the spraying requirements are uniform and thoughtful, especially pay attention to spraying the back of the leaves. When spraying, it is best to move the potted flowers outdoors, and if spraying indoors, do not approach food and utensils.

After each use, pour out the excess liquid and wash the sprayer with clean water.

(1) Red spiders, also known as leaf mites, can harm all kinds of vegetables, flowers, fruit trees and even weeds on the edge of the field. Suck nutrients directly on the back of strawberry leaves and fruits, and in severe cases, the leaves turn yellow and dwarf, and the flowers are not fruitful or form secondary fruits, and finally the whole plant dies. Due to the low mobility, small patches often occur in the greenhouse (Figure 9-4).

Often because of the attachment to the seedlings when planting, the initial parasitic in the back of the leaves near the ground, after the reproduction gradually move upward, although after the flowering period will appear on the surface of the damaged leaves will appear small white spots, but it is not easy to find, high temperature and drying will aggravate the harm, so with the increase in temperature, the density of insect population increases, coupled with the increase in greenhouse water evaporation, after entering March, especially in April and May, the symptoms will appear obviously.

Figure 9-4 Symptoms of red spider mites infesting leaves.

2) Prevention and control methods can be used in common areas after colonization to prevent and control 1 time, in order to eliminate hidden dangers, to avoid many negative effects caused by the use of drugs during flowering and fruiting periods, 2% avermectin microemulsion 2000 3000 times liquid can be applied. During defoliation operations, the lower leaves removed are often parasitic to spider mites, so leaf picking is a good control measure. In the flowering and fruiting period, it can be sprayed with 1000 1500 times of 5% cardiac gram (fipronil) emulsifiable concentrate, or 10% Liuyangmycin emulsifiable concentrate 1000 times, or 20% alkyne mite special aqueous emulsion 500 1000 times liquid spray control, the amount of liquid medicine should be sufficient, the back of the leaf should be sprayed, and the interval should be 1 week, and then sprayed 1 time.

The spraying range is 1 2 meters in and around the occurrence. Spider mites are susceptible to drug resistance, and it is best to use more than two agents interchangeably.

Leaf mites, also known as red spiders, are a general term for various mites, commonly known as red sand, dragon insects, fire beads, etc. It is an important pest mite for jujube leaves, and it can dry up and fall off the leaves of jujube trees if the damage is serious. According to the observation and data, the pest mites that harm jujube trees are composite groups, and the composition of pest mites is different due to different regions, climates, times and crops, and the dominant populations are also different.

There are four species of red spiders belonging to the genus Tick Mites: cinnabar leaf mite, two-spotted leaf mite (common leaf mite), truncated leaf mite, hawthorn leaf mite; Alfalfa bryosis of the bryogenus bryophyllum is also known as Ledihua bryode. Among them, cinnabar leaf mites, two-spotted leaf mites and truncated leaf mites are common on cotton, so they are also commonly known as cotton red spiders, which are common red spiders in jujube orchards (Figure 21).

Fig.21 Two-spotted leaf mite.

1) morphological characteristics of the spider spider species is smaller, 1 year of reproduction generations, from north to south generation increases, some as many as more than 20 generations, Zaoyuan red spider is a mixed population composed of a variety of red spiders, different years, different regions, different management measures will have different dominant populations, in order to facilitate the prevention and control, to understand the red spider for the damage parts, wintering places, in order to use drugs in the critical period, improve the control effect is very necessary. The main populations of spider mites commonly found on jujube trees are listed in Table 9.

Table 9 Common red spiders in jujube trees.

2) Control methods Agronomic measures. Scrape the bark in early spring, prune the dead and diseased branches during pruning, remove weeds, fallen leaves, root tillers and seedlings in the jujube orchard, destroy the wintering place of red spiders, and reduce the number of overwintering adults or eggs.

In mid-March and mid-June, wrap tape on the smooth part of the trunk and apply shellac to the tape, which can stick to the migrating red spiders on the tree, and also treat other pests such as green blind tsubaki and jujube buqu.

Biocontrol. There are many natural enemies of red spiders, according to reports, there are more than 10 kinds of common predatory mites in orchards, in addition to grass lacewings, praying mantises, spiders and other natural enemies, attention should be paid to protection and utilization, and where conditions permit, they can be artificially raised and released in jujube orchards to control the harm of red spiders.

Pharmacological prevention. Before the jujube tree sprouts, spray 5 Baumé stone sulfur mixture to kill the overwintering adults and eggs.

In the first and middle of June, if the density of red spider is large, you can use 20% mite nephthol net suspension 2000 3000 times solution plus 4000 6000 times of emulsifiable concentrate, or 1000 times of 20% diaformamidine emulsifiable concentrate or 2000 3000 times of 5% bacarin suspension or 3000 4000 times of 15% tachydidonel emulsifiable concentrate, all of which have good control effects.

When the control index is reached, but the density is not large, it can be sprayed with Liuyangmycin 10% emulsifiable concentrate 1000 times, and the resistant red spider can be sprayed with Baumé stone sulfur mixture (note that it should be avoided during high temperature periods).

Red spider, also called: red leaf mites. Spider mites are in the family Arachnidae.

Strong fecundity, multiple generations occur in a year, fast development rate, short cycle, both sexes, parthenogenesis can reproduce, strong adaptability, wide transmission mode. There are 3 similar species in common, which mainly harm a variety of vegetable crops such as Solanaceae, Cucurbitaceae, Fabaceae, and Liliaceae.

Agricultural control]: According to the biological overwintering habits of spider mites, the bark can be scraped and burned before the overwintering eggs hatch, and most of the overwintering eggs can be killed by applying white (lime water) to the trunk after scraping. According to the law of hatching eggs of spider mites, after hatching, they first feed on weeds and reproduce.

Ploughing can be done in early spring to remove weeds from the ground and keep the field free of weeds during the hatching of overwintering eggs, so that spider mites die because they cannot find food.

Biological control]: The species of red spiders in the field mainly include Chinese lacewings, mite-eating ladybugs and predatory mites, among which the Chinese lacewings have a large population and a large amount of predation on red spiders. Therefore, protecting and increasing the number of natural enemies can enhance their control effect on the spider mite population.

Chemical control]: can be applied mite danger 4000 5000 times (100 ml per bottle mixed with water 800 1000 kg) uniform spray, 40 dicofol EC 1000 1500 times liquid, 20 mite kill net wettable powder 2000 times liquid, 15 pyrida dipyrin EC 2000 times liquid, zitogenol EC 6000 8000 times can achieve the ideal control effect.

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.

1) Agricultural control.

Mulching cultivation can significantly reduce the damage, remove the pastoral, autumn tillage and damage its habitat environment.

2) Lime belt seedling protection.

5 7 kg of quicklime per 667 m2 is sprinkled on the edge of the ditch, at the head of the ground or between the rows of crops during the damage period to repel insect bodies and damage crop seedlings.

3) Paraacetaldehyde is used for chemical control to prepare soybean cake flour or corn flour poison bait containing about 4% of the active ingredient, and sprinkle it on the ridge of the field in the evening to trap it; or sprinkle 22 kg per 667 meters with 8% phosphorus dichlorvos granules; Or in the early morning, when the snail has not dived into the soil, spray 800 1000 times of phosphorus, dichlorvos or copper sulfate.

Try not to use dichlorvos and dimethoate to deal with red spider (mites), because the smell of these two pesticides is too great (they can't be dispersed for many days, especially smoking), and they are not special drugs for red spiders. Let me introduce you to a few special drugs: (I often use them, especially easy to use.)

And there is no smell, pesticides are sold everywhere, just buy them back and use them according to the instructions. Dicofol Metamidine Malathion Lesburn Kills Any of the above has a special effect on leaf mites (red spiders). The usage is simple :

Use the "Wahaha" pure water bottle cap to fill a cap of medicine and mix it with a bottle of water. (The above medicines are all mixed like this) Home remedies: 1. Spray laundry detergent solution.

Ratio 1:250 2, spray soap. Scale 1:

50 3. Spray tobacco liquid. 10:250 (take 20 grams of tobacco, add 500 grams of water and soak for 24 hours, then filter, take the filtrate and spray) 4. Spray chili liquid.

Take 50 grams of dried red pepper, add 10 times of water, boil for 20 minutes, filter, and spray with filtrate).

Mites and spiders belong to the same class of arachnids, adults have 4 pairs of legs, a pair of tentacles, no wings and antennae, and the body structure is different from that of insects. The body of the worm is divided into a jaw body and a body, the jaw body is composed of mouthparts and a jaw base, and the body is divided into a foot body and a terminal body. Mites have a lot of hairs on their bodies and feet, some of which are very long.

There are mouthparts at the front end, and they have a variety of eating habits, such as dandruff.