What medicine is used to prevent watermelon red spider?

Watermelon is a fruit that prefers to grow in a warm and arid environment, and needs sufficient sunlight and relatively stable temperature and humidity. Watermelons are not tolerant to waterlogging, so drainage and irrigation facilities must be done during the planting process. In order to achieve high yield of watermelon and reduce the erosion of pests and diseases, it is necessary to choose a sandy soil with a deep soil layer and loose texture that has not been planted with melon crops in the past 3 years; Apply 2 tons of cooked manure and 1 ton of cake fertilizer per mu, and the soil is relatively poor, and an appropriate amount of about 50 kg of potassium nitrate fertilizer needs to be applied. The growth of watermelon may also face the erosion of various pests and diseases, and spider mites are very common insect pests, how to prevent and control them?

1. The impact and damage of red spiders on watermelon. All pests and diseases are not conducive to the growth of crops, and spider mites, also known as "fire plants", are a pest of the leaf mite family that feeds on the sap of the leaves and stems of watermelons. The reproductive cycle of spider mites is relatively short, it can produce 13 generations a year, and each egg can reach about 100.

The larvae, adults, and nymphs of red spiders are extremely harmful to crops such as watermelons; When spider mites are infested, they can cause the entire watermelon plant to die.

Second, the law of red spider erosion of watermelon plants. Spider mites not only have a short reproductive cycle, but they are also very capable of overwintering, surviving in soil, dead leaves, and plant roots. In the second year, when the temperature exceeds 6, it begins to move and breed again, and the red spider begins to erode watermelon seedlings in April and May; It was most severe in May and June.

It is mainly affected by the climate characteristics of high temperature and high humidity in summer, and when the air humidity is below 55%, it is the best period for spider mites to breed, and it will spread by wind, rain and other ways.

3. Drug prevention and control measures for watermelon red spider. Restricted by the growth environment and climate of watermelon, it is very difficult to completely eliminate red spiders. However, comprehensive prevention and control measures are still more conducive to reducing the probability of erosion.

Before colonization, do a good job of soil deep ploughing and sanitizing treatment, watermelon seeds can also be soaked with carbendazim and other seeds; When applying base fertilizer, make sure to use rotted farmhouse fertilizer. Once it is found that there are red spiders in the seedling leaves of watermelon, you can spray foliar sprays with drugs such as pyridoxin, alkyne mites and avermectin according to the effect of spraying, and spray again after 10 days, so that the control effect will be better.

You can use plant-specific insecticides, evenly spray on the leaves of plants, and it is not advisable to water during the medication, otherwise there is no effect, you can spray it several times to consolidate it.

Now there are a lot of drugs for the first red spider on the market, and it is recommended to use these agents, such as 22% avirospirolate, 24% bifenazine spirofenoxil, 25%-30%-45% bifenazine ethoxazole or spiroethyl ester avermectin, 30% acetazole dinitril, 30% nitrile difenoxil and other agents are used alternately, and the effect is very good.

However, in order to prevent watermelon from being harmed by red plants, plant growth and yield decline, it is necessary to do a good job of prevention and treatment in advance. After the watermelon harvest should be cleaned up in a timely and thorough manner, and in autumn and early spring, we must do a good job of removing weeds and dead branches and leaves on the edge of the field, roadside, and ditch, and the field can be used to eliminate overwintering insect eggs by winter plowing and winter irrigation. In the process of watermelon growth, we should pay attention to irrigation and reasonable fertilization, and when we find that there are red plants, we should spray the back of the melon leaves alternately with the above agents, and we must spray carefully.

Pyridoxin, alkynyl mite, and avermectin. It works very well, and you need to use it according to the instructions on the manual.

Citrus red spider, also known as citrus full-clawed mites, is the first major pest of citrus, in order to deal with this pest, the annual control cost is almost more than 50% of the cost of citrus pest control. For the prevention and control of red spider (pest mites), we can not simply consider the selection of those drugs, but: one is to use drugs in an appropriate period, the second is to alternate drugs and choose drugs, and the third is to improve the coverage rate of drug fog.

In order to achieve better prevention and control results. 1. Appropriate medication. 1. Liuyangmycin is an agricultural antibiotic acaricide, which can control red spiders in apples, hawthorns and citrus.

Dixazine is a highly active organic nitrogen heterocyclic acaricide, which can control red spiders in apples, hawthorns and citrus.

<> suggests a bactericidal additive, which is still very useful for spider mites. Garlic oil, the concentration of use is generally 1000-1500 times, not only can kill fungal spores, but also has a good effect on bacteria, the use of all know why it is effective for red spiders, moths, the current market agents are mainly in the case of a set, generally speaking, the main components of the current pesticide manufacturers acaricides are avermectin, spirodioxidoxil, ethoxazole, bifenazide, bifenthrin, deltamethrin, probromophos, fluridin, etc.

It has a good contact killing and stomach toxicity effect, and is effective for all characteristics of pest mites, including eggs, nymphs, and adult mites, and has good quick effect, with an effective period of more than 30 days. Because it is an analogue of methoxyacrylate fungicide, in addition to being effective against pests and mites, 1. Spray when there are 3 or 4 red spiders per leaf on average, and do not wait for a large outbreak to spray, which is more difficult to control. Seize the opportunity of spraying pesticides in winter to effectively reduce the base number of overwintering mites and reduce the source of insects in the spring of the next year.

Red spider chemical control application mite danger 4000-5000 times (100 ml per bottle with 800-1000 pounds of water) uniform spray, 40% dicofol EC 1000 1500 times liquid, 20% mite kill net wettable powder 2000 times liquid, 15% pyridafen emulsifiable concentrate 2000 times liquid,.

Agricultural control: apply well-decomposed organic fertilizer. In autumn ploughing, some larvae can be turned to the surface and picked up manually or let them be dried, frozen to death or preyed on by natural enemies.

Light trapping adult insects Use 15% pyridoxone 3 000 times solution, or 73% gmite emulsifiable concentrate 2 000 times solution, or Uranus emulsifiable concentrate 3 000 times liquid spray, spray once every 10 days, spray 3 times in a row.

Liuyangmycin: It has a certain inhibitory effect on eggs, and can also be mixed with organophosphorus pesticides and carbamate pesticides, commonly used 10% emulsifiable concentrate, with a concentration of 1000-1500 times.

The drugs used to control cucumber red spider are: Liuyangmycin, diamidine, Gramite, Damite copper, Nisolan and so on.

5% emamectin benzoate microemulsion 7500-10000 times, 10% bifenthrin EC 3000 times, 20% fenmethrin EC 2000 times, 28% methyl cyanophos 1000 1500 times;Any one or two of the above agents can be mixed with 50% chlorobromoisocyanuric acid soluble powder 1500 times, natural brassinin EC 6000-10000 times, green wind 95600 times, Kebao plant eubiotics 1500-3000 times (transplanted crops, pesticide damage and fertilizer damage, frost damage, waterlogging damage, strong roots and seedlings, and 1500 times used to control the use of wang) to mix evenly foliar spray. 1 time every 5 7 days, 2 3 times of continuous control, focusing on spraying the back of young leaves, young stems, flowers, growth points and young fruits on the upper part of the plant, and pay attention to alternate use.

Nisolan, also known as thiofenone, has good penetration of the plant epidermis, but there is no systemic conduction, the killing effect on young mites is relatively strong, but the effect on adult mites is relatively poor, can inhibit the hatching of some eggs, this drug only needs to be used once a year, otherwise it will produce resistance.

Hello dear!It is best to kill the red spider on the melon with avermectin, pyridoxalin, alkyne mite and other medicines, and watermelon red spider can use avermectin, pyridoxin, alkyne mite and other agents, spray once every 7-10 days, spray 2-3 times, all have a good control effect. In addition, it is also necessary to reasonably top dressing and irrigation to promote the growth of watermelon and make the plant robust, so as to increase the resistance of watermelon If my answer is helpful to you, please also give a like (evaluate it in the lower left corner), looking forward to your like, your efforts are very important to me, and your support is also the driving force for my progress and slow rise.

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1. Self-made method: chili boiled water: take 50 grams of red dried chili peppers, add 1000 grams of water and boil for a quarter of an hour, and spray the supernatant after filtration, which can control whiteflies, aphids, red spiders, bugs and other pests;

2. Physical method: suffocate small spider insects with high-lipid membrane production enhancer (emulsion);

3. Chemical methods: a variety of chemical agents.

According to the biological learning of spider spiders, agricultural, physical, and chemical control measures can be applied.

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 spider mites and the habit of feeding and reproducing on the weeds first after hatching, ploughing the ground in early spring to remove the weeds on the ground, and keeping the field free of weeds during the hatching of the overwintering eggs, so that the spider mites die because they cannot find food.

3) 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.

4) Chemical control application of mite danger 4000-5000 times (100 ml per bottle mixed with water 800-1000 pounds) uniform spray, 40% dicofol EC 1000 1500 times, 20% mite kill net wettable powder 2000 times, 15% pyridafen EC 2000 times, 1 8% zitogenol EC 6000 8000 times, etc. Pay attention to the weather conditions when spraying, if it rains after spraying, you need to spray again on a sunny day.

With the happy forest magnificent Avi. Pyridoxine is sprayed on the foliage.

First, the aphid whitefly, pesticide resistance is different in different places. Generally, dinotefuran or thiamethoxam or dinotefuran or pymetrozine or thiamethroprid, etc., mixed bifenthrin is also OK.

Thiazinone kills eggs, does not kill adults, it must be mixed with other pesticides, thiazinone can not be used for radish, leafy vegetables, and is harmful. The egg-killing effect of pyridyl ether is also good, and it is ineffective for adult worms, so it is better to use it with the above products.

It is recommended to spray silicone spray, spray in the morning and evening, and apply thoroughly. Protected areas can be combined with insecticidal aerosols.

Use pesticide ingredients alternately, and do not use the same pesticide ingredients consecutively. This is the principle of crop protection.

Second, the harm of red spider mites, it is recommended that avermectin pyridafen or ethoxazole or spirodifen (pay attention to the dosage and avoid high temperature), or buflufenoxalate or bifenazide and so on alternately.

If it is cultivated in greenhouses, serious ones can also be combined with pyridoxin aerosol.

The bees move away for the day.

There are many types of red spiders, but the main one that harms watermelon is the eggplant red spider, also known as the cotton red spider. It belongs to the arachnidae family of ticks. In addition to watermelon, red spiders also harm cotton, sorghum, corn, tobacco, beans, eggplant and other crops.

Harmful symptoms. Red spider to adult mite swarm on the back of the melon leaf sucking juice for damage, the initial damage of the leaves presents yellow-white dots, and then becomes light red small spots, when the spots are severe, the back of the leaves is covered with silk webs, the yellow wilting of melon leaves gradually scorched, from falling off, seriously affecting the growth and development of plants.

Patterns of occurrence. Spider mites overwinter as female mites on dead leaves, soil crevices and weed roots. In the second year, when the average daily temperature reaches 6, they start to move and feed. In North China, red spiders on the open ground begin to damage plants from March to April, and the most serious damage is from May to July, and can be harmful in greenhouses and greenhouses.

The number of breeding generations per year varies depending on climatic conditions, and it takes more than 17 days to complete a generation when the average temperature is below 20. Spider mites love drought and have an optimal relative humidity of 35%-55% for reproduction. Therefore, drought years are conducive to the occurrence of spider mites.

Spider mites are mainly transmitted by crawling and wind, but can also be carried by running water and humans and animals.

Prevention and control methods. After the watermelon is harvested, the fields are thoroughly cleaned, and the weeds and dead branches and leaves on the edge of the fields, roadsides, and canals are removed in late autumn and early spring, combined with winter plowing and winter irrigation, to eliminate the source of overwintering insects. Pay attention to irrigation and proper fertilization.

Red spiders and white spiders generally occur first on the back of the leaves, and only come to the surface of the leaves later, so attention should be paid to when spraying.

Because avermectin is a delayed-acting agent, the effect is relatively slow, so it is not recommended.

In addition, it should be noted that after the watermelon is harvested, the fields should be thoroughly cleaned, and weeds and dead branches and leaves should be removed from the fields, roadsides, and canals in late autumn and early spring, combined with winter plowing and winter irrigation, to eliminate the source of overwintering insects. Pay attention to irrigation and proper fertilization.