What to do if citrus yellow spider is serious, and which drugs are the most effective to treat citru

Agricultural control. First of all, on the basis of selecting improved varieties, reasonable dense planting, timely pruning, so that the orchard has good ventilation and light transmission; Secondly, strengthen cultivation management, such as fertilizer and water management, to enhance tree strength.

Biocontrol. The control effect on citrus yellow spider is the mite-eating ladybug and predatory mite; This is followed by lacewings, thrips, viruses, etc. In order to protect these natural enemies, we should adopt a comprehensive management method in the prevention and control, and try to use as few pesticides or as few as possible without highly toxic pesticides, so as to reduce the harm to them.

If conditions permit, artificially release or divert natural enemies at appropriate times. Biogas slurry control. Biogas slurry is the liquid after fermentation in the biogas digester, which has no pollution, no residual toxicity, no resistance, and the biogas slurry has a killing effect on citrus red spider and yellow spider.

50 kg of biogas slurry, after clarification and filtration, it can be sprayed directly. Under normal circumstances, red spiders and yellow spiders are inactivated in 3 to 4 hours, and the mortality rate is more than 90% after 5 to 6 hours.

Chemical control. The critical period is to use drugs to prevent and control from spring bud germination to flowering, and in the later stage, natural control is advocated and should not be universally used. The chemicals used before flowering are 4000 5000 times of 20% ditazine (pyridoxone, morning glory) wettable powder, 2500 3500 times of 5% thiobenone (nisolone) emulsifiable concentrate (note that in some areas resistance has been developed % tetradizine (also known as mites dienet, Apollo, and Nisolan have cross-resistance) wettable powder 1000 2000 times, 50% tetradibenzine (Apollo) suspension 4000 5000 times liquid, solid stone sulfur mixture 1000 times or 95% 100 200 times the liquid of the emulsion of engine oil.

After flowering, use fast-acting agents with little impact on natural enemies: 5% azole difen (badifen) suspension 2000 3000 times, 73% gite (mite, mite removal) emulsifiable concentrate 3000 times, 50% phenylbutyltin (tork) wettable powder 2500 times, 50% bromodifen (mite) emulsifiable concentrate 2500 times, 20% diaformamidine (mite) emulsifiable concentrate 1500 times, 2% EC (Luo Sufa) emulsifiable concentrate 2500 times. The above pre-flowering agents can still be used.

In the prevention and control period, under normal circumstances, no spraying can be done in winter, but in areas where the temperature reaches more than 10 in January and February, especially in dry areas in winter and spring. Spring control is best carried out when spring buds have just germinated. When using stone sulfur mixture and engine oil emulsion, pay attention to sunlight and temperature to avoid pesticide damage.

Engine oil emulsion should not be used on fruiting trees from half a year of flowering to before the second physiological fruit drop and after mid-August.

Hit it with mineral oil a few times, and you should be able to control it.

At this time, you can choose a variety of pesticides to mix together, such as colloidal sulfur, and then you can also choose engine oil emulsion, and then you can also spray pesticides in time, and then you must water in time, and at the same time be sure to choose the right fertilizer, but fertilizer should not be added too much at one time.

The drugs with better effects are, brassinolide, chlorophyll, ethoxazole, hexaftin, double archer, etc., which are very suitable and have very good effects.

Colloidal sulfur, motor oil emulsion, gite emulsifiable concentrate, carcogram suspension, avermectin, etc., these drugs can be used for red spiders.

Citrus red spider.

Rust spiders belong to the order Tick Mites. Adult mites, mites and young mites suck the sap of citrus leaves, twigs and fruits, which affects tree strength and yield when the damage is severe.

1. Biological control.

1) Protection and utilization of natural enemies. Eradicate malignant weeds in the orchard, retain benign weeds or artificially plant white flowers, protect natural enemies, and provide habitat and breeding places for natural enemies.

2) Unleash predators. Artificially release predatory mites to control the occurrence of red spiders and rust spiders. Generally, from early April to early to mid-August, release 1 2 times, and release more than 300 predator mites per plant each time. Acaricides and broad-spectrum insecticides should not be used during mite release.

2. Chemical control.

1) Young fruit stage in spring. For the control of red spiders, 5000 times of 11% ethoxazole suspension, or 4000 times of 24% spirodifenoxil suspension, or 1500 times of 5% thioxenone EC were sprayed.

To control rust spiders, spray with 20% butyl sulfur carbofuran EC 1500 2000 times.

2) Fruit expansion period to maturity stage. For the prevention and control of red spiders, 24% spirodifen suspension agent 4000 5000 times is sprayed.

To control rust spiders, use 20% butyl sulfur carbofuran emulsifiable concentrate 1500 2000 times, or engine oil emulsion 500 times liquid.

3) Clearing the garden in winter. Use 73% alkyne mite emulsifiable concentrate 2000 3000 times, or 5% azolodifen emulsifiable concentrate 2000 2500 times, or engine oil emulsion 500 times and so on.

3. Precautions.

Citrus shoots and young fruits are more sensitive to acaricides, and improper use is easy to cause pesticide damage, so choose to use acaricides according to different periods.

The control measures for citrus red spider and rust spider are as follows:

1. Agricultural prevention and control. Reasonable pruning in combination with garden cleaning to prevent excessive shade of the canopy. Strengthen fertilizer and water management to enhance tree strength.

2. Biological control. Favorable conditions can be created for the reproduction of natural enemies by keeping shallow roots, benign weeds such as thistle or twisted mountain mung bean in citrus orchards, or planting green manure and other mulching plants. In the summer and autumn when rust spiders occur in large numbers, the use of copper-containing fungicides such as Bordeaux liquid should be avoided as much as possible.

3. Pharmaceutical prevention and control. Strengthen the insect inspection, check the back of the spring leaf or the back of the young fruit, pay special attention to the drooping inner fruit, an average of 2 3 rust spiders or leaves, when there is yellowish dust on the young fruit, the drug should be immediately controlled.

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Citrus red spider is most effective with chlordane, imidacloprid, carbendazim and other drugs.

1. Chlordane. This is a broad-spectrum insecticide that effectively kills both adults and larvae of citrus red spider spiders. When using, you need to pay attention to the dosage and the method of making the band deficit.

2. Imidacloprid.

This is a new class of insecticides, which has the advantages of being fast, efficient and low toxic, and can quickly kill citrus red spiders. It is necessary to pay attention to the dosage and method of use when using.

3. Carbendazim.

This is a broad-spectrum fungicide that effectively kills the larvae and eggs of citrus red spiders. When using, you need to pay attention to the dosage and method of use to avoid adverse effects on the environment.

Biological characteristics of the citrus red-cracked Xingqing spider

Citrus red spider overwinters in the back of citrus leaves, rolled leaves, branches, bud crevices or deciduous dead branches in eggs, adult or concealed in the back of citrus leaves, branches, buds or deciduous dead branches, and the temperature rises in March and April of the following year, and the egg development starts at the starting temperature, and the overwintering eggs hatch into adults in large quantities, migrating from the old leaves to the spring shoots to grasp the new leaves to reproduce. From July to August, due to the high temperature and heat, it is not conducive to the growth and development of red spiders, and the number of insect populations is small. From September to October, the temperature drops, and the insect population rises again, which is the second peak of the insect population.

There are two reproductive modes of citrus red spider, generally hermaphroditic, but there are also parthenogenesis, which brings great problems to the control of citrus red spider. Generally, citrus red spider math lays eggs on the fruit or young leaves of fruit trees, which are rich in nutrients and provide energy for their larvae to grow and develop. A female adult mite lays an average of 30-50 eggs in her lifetime, and the number of eggs produced by the generation is the most in spring and the least in summer.

Citrus red spider is the most effective with acaricato, the main drug is ethoxazole, this kind of drug according to a reasonable ratio, can effectively control red spider. Ethoxazole can effectively control the development of eggs into adult worms. Other control methods can also be used, such as improving the planting environment, strengthening the management of the planting environment and protecting the natural enemies of spider mites.

If red spiders are born on citrus, the citrus leaves will curl and dry up, and even cause the fruit to fall off, which will greatly affect the overall yield of citrus. Many people want to know what medicine is most effective for citrus red spider, citrus red spider will break out in large numbers, and some insecticides are useless for it, so special acaricide drugs need to be used, and the main agent is ethoxazole.

Ethoxazole can effectively kill the eggs, inhibit the embryonic development of the mites, when applying the etexazole, it is best to eat in the early stage of mite infection and reproduction, which can effectively prevent the eggs from developing into adults, and minimize the harm to citrus. And when administering the agent, it needs to be diluted according to 5000 7500 times before use.

1. Improve the planting environment

Strengthen the management of the planting environment, timely pruning, drought resistance and drainage measures, reasonable water and fertilizer, use fully disinfected and decomposed fertilizer, enhance the ability of citrus trees to resist diseases and pests, and effectively prevent the reproduction of red spiders.

2. Protect natural enemies

The natural enemies of red spiders mainly prey mites, ladybugs, lacewings, parasites, etc., protect the growth environment of natural enemies, so that they can hunt and kill red spiders in large quantities, which is a better biological control method, and is safe and non-toxic, and has no harm to human health, and the natural enemies of red spiders are not harmful to fruit trees and fruits.