When it comes to citrus red spiders, everyone will have a headache because this bug is too difficult to treat. However, what Xue Nongjun wants to say is that the relatives of the red spider, the rusty tick, are not easy to mess with.
<h1>The hazard of rusty ticks</h1>
Invasion of leaves: mainly on the back of the leaf (especially on both sides of the main vein) to suck sap, resulting in the appearance of black-brown reticulated lines, and causing the leaves to curl, rough, and even may fall leaves;
Damage to the fruit: Compared with the invasion of the leaves, rust ticks are more harmful to the fruit, there will be loss of luster, wood pegs, roughness, serious will be covered with cracked fine lines, the fruit becomes smaller, lose water, and may also increase the occurrence of fruit fall!
In short, rust ticks can puncture the leaf back or the epidermal oil cells of the fruit, causing copper-green, russet or black-brown, which affects the transpiration of the plant, and also reduces the drought resistance of the plant, which may not only cause a large number of leaves to fall off, but also cause a large number of fruit drops or affect the price of the fruit.
Originally, the black peel fruit is enough to affect the price, and the rust tick can also weaken the tree potential, resulting in the situation of "one year of copper, three years of poverty", so for the price of the fruit, the rust tick must be well prevented!
<h1>There is a problem with the red spider</h1>
How to prevent rusty ticks? At this time, we are going to talk about the "close relative" of the rust tick , the red spider. Although one of them is called "lice" and the other is called "spider", in fact they all belong to mites, not insects.
The above figure may be a bit complicated, I want to say that red spiders and rust ticks are mites, and are particularly far away from insects such as wood lice and leafminer moths. Don't look at the rust tick and the wood lice have "lice" in their names, the relationship between them is the same as that between humans and Wenchang fish, the difference is particularly large!
Therefore, you fruit farmers and friends must pay attention to the use of drugs, rust tick medicine is actually similar to the red spider medicine, the use of acaricide effect will be better than the effect of insecticide.
Rust ticks and red spiders are very reproductive, as long as the temperature reaches 15 ° C can reproduce, the most suitable temperature for growth is about 28 ° C.
<h1>Use medicine to extinguish it with care</h1>
Rust killing tick medicine inside, butyl ketoxybudweis because of its strong lethality, fast effect, and small damage to fruit trees, not easy to produce drug harm by the majority of fruit farmers love, in Lu Wenyi teacher rust tick recommended drugs also mentioned that butyl sulfur and Daisen manganese zinc, Avi spirant ester and other agents mixed effect is good.
But! Due to the presence of residues of butyl sulfur and the great harm to the environment, the use of butyl sulfur will be banned on fruits and vegetables after 2019 (next year). Although it is difficult to say how to learn how to ban it at that time, after the ban on paraquat, there was a situation of "3,000 yuan in fines with 3 bottles".
What to use without butyl sulfur?
Except for the second row of butyl sulfur, other agents can be considered for use. In addition, although the rust-killing tick does not emphasize the addition of ovulicides like the killing of red spiders, in order to have a better effect, it is best to take the initiative to add it, do not give it the opportunity to recur, and can also reduce the next trouble.
Recommended medication: 1.8% avermectin 1500 times + 5% lice mite urea 1500 times 1.8% avermectin 1500 times + 15% zoloftamide 1500 times mineral oil 200 times + 22% avi spirene 2000 times Avi triazole tin 1000 times (no shoots July-October)
<h1>Timing of use</h1>
So when do you need to take the medication? Rust ticks occur between May and October, and prevention can be carried out in a planned manner from early May.
Beginning from the end of May to the beginning of June, it is best to start the first comprehensive control of rust ticks in mid-to-late May;
June to August is a high incidence period, and it may be necessary to focus on prevention and treatment;
From September to October, rust ticks begin to shift to the autumn shoots to harm the leaves, and it is necessary to observe the disease in time to actively use drugs, and it is best to fight together with the medicine of red spiders and miscellaneous insects.
Special reminder: when high temperature and drought should pay attention to the concentration of drugs, after the drought rain should also strengthen the drug prevention measures in time.
<h1>Discovery and spraying methods</h1>
For rust ticks, we must find and medicate in time, because rust ticks are smaller than red spiders, so it is easy to ignore at the beginning, and when there are leaves, fruits or a large number of fallen leaves, it is actually too late!
Observe the rust ticks must borrow the help of a magnifying glass, pay attention to the leaf back and fruit surface, and find that there are dusty small insects on the surface, you should immediately spray the drug to prevent it.
Spraying site: the inside and lower parts of the canopy should be sprayed first, and then the outer and upper parts of the canopy should be sprayed (focusing on spraying the back of the leaves and the shady side of the fruit);
Spraying time: before 10 a.m. or after 5 p.m.;
Spraying standards: be careful and thorough, be sure to spray until the leaves and fruits are wet, generally spray 2-3 times, each time at an interval of 7-10 days.
<h1>note! </h1>
Like other pests and diseases, the use of rust ticks also requires attention to avoid single medication. Repeated use of the same acaricide for many years can cause rust ticks to become extremely resistant to the agent.
As shown below, the constant use of a drug will strengthen the resistance of rust ticks, while the continuous increase in the amount of application will further enhance the resistance to this drug.
<h1>Protect predators</h1>
Polychaetes and predatory mites are important natural enemies of rust ticks, and through rational use of drugs, they can avoid accidentally injuring the natural enemies of rust ticks, and can better inhibit the occurrence of predatory mites.
Copper preparations: Copper preparations such as Bordeaux liquid can not only stimulate the growth and development of rust ticks, but also kill polyfacilli, so it is necessary to avoid the use of copper preparations during the high incidence of rust ticks;
Bacteriostatic pesticides (such as killable) will kill polychaetes in large quantities and should also be avoided;
Ester pesticides (such as scavengers, etc.) will kill a large number of beneficial insects such as grasshoppers, ladybirds, and predatory mites, and should also be avoided as much as possible.
In addition, enhancing fertilizer management, paying attention to drainage and irrigation and other ways to improve tree resistance are also beneficial to the prevention and control of rust ticks.
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