When is the effect of spraying fruit tree scale insects good?

1. Prevention and control of natural enemies First of all, we must understand the natural enemies of scale insects, and then find ways to introduce and protect, and use natural enemies to treat insects. For example, the main natural enemies of the scale are the Australian ladybug and the large red ladybug; The main natural enemies of P. palina are S. montoni; The main natural enemies of black-spotted scale insects are oligonode wasps; The main natural enemies of beetle scale insects and red wax scale insects are jumping wasps and so on. The use of natural enemies to control scale insects is a more thorough and trouble-free method, but it is more technical.

2. Pesticide control The key is to apply pesticides when the first-instar nymphs are active. Generally, the nymphs that have just hatched do not immediately crawl out of the wax shell of the mother, often wait for 1---3 days, and then crawl out one after another when the weather is sunny and warm, and then begin to fix after crawling for a period of time, and then after a few days, the outside of the body will be waxed one after another, and when the worm body is waxed, it is more difficult to prevent and control. Therefore, once a scale insect is found crawling out from under the mother, it should be sprayed immediately.

Generally, it can be sprayed with 800---2000 times of imidothion, or 1000---1500 times of dichlorvos liquid spray, and can also be controlled with pine alkali mixture to prevent and control pesticide concentration, which can be thicker in winter and thinner in summer. Other systemic pesticides, such as monocrotophos, fluoroacetamide, insecticidal ether, pine borer, dimethoate, etc., can also be used, but pay attention to the forest object, pest species and the time of occurrence of insect pests, so as to achieve safe application.

3. Pruning and control Scale insects like shade and humid external environment. In order to create unfavorable living conditions for scale insects and achieve the purpose of controlling the reproduction of scale insects, the winter forest trees are used to prune and reduce the humidity. If it cannot be pruned and thinned, and the victim tree has an obvious dormant period of deciduous leaves, diesel can be injected on a trial basis in winter.

Diesel fuel can directly destroy the wax shell of scale insects, kill scale insects, after the beginning of spring, the general shoots can be pulled out again, does not affect the growth and development of forest trees.

Pyryl ether, spiromel ethyl ester, chlorpyrifos1. Pyripropyl ether is a relatively good agent for the prevention and control of scale insects, and its effective period can be as long as more than 2 months. Moreover, the success is not high, and there is no cost burden. It can not only control scale insects, but also thrips, aphids, psyllids, etc., the effect is very outstanding.

2. Snail ethyl ester has strong systemic properties, can be transmitted in both directions in the plant, and the insecticidal speed is relatively slow, and it takes about 10-15 days to completely kill the insects like pyridyl ether!

3. The toxicity of chlorpyrifos is greater than that of the first two, and it mainly kills scale insects through contact killing and stomach poisoning, and there is no systemic property. The insecticidal effect is relatively good. However, it must have been used for a long time, and the insects are more resistant to it, and the toxicity is relatively large, and it has come to the verge of being restricted.

<> use pesticides such as dimethoate, malathion, imithion and deltamethrin to kill scale insects. You can choose 50% malathion 1500 times liquid, 25% imidothion 1000 times liquid, 40% dimethoate 1000 times liquid, deltamethrin 3000 times liquid spray control, continuous prevention and control 2-3 times, every 7-10 days for prevention and control. When spraying, it is necessary to spray evenly, and if it rains within 48 hours after spraying, it needs to be sprayed.

1. What pesticides can be used to kill scale insects?

1. The use of pesticides such as dimethoate, malathion, imithion, deltamethrin and other pesticides can kill scale insects. In the peak stage of scale scale insect nymphs, 40% dimethoate 1000 times liquid, 50% malathion 1500 times liquid, 25% imidothion 1000 times liquid, and deltamethrin 3000 times liquid liquid were used for spray control. Spray 1 time every 7-10 days, 2-3 times in a row.

2. There are many scale insects, wide distribution, and miscellaneous food, which harms a variety of crops, fruit trees and trees. The common ones are red round scale, brown round scale, Kang pian scale, sagittal scale and blowing cotton scale, Kang's mealybug, etc.

3. Scale insects harm leaves, branches and fruits, causing yellowing of leaves, bursting of branch cortex, swelling, serious death, and causing leaf and fruit drop. It is easy to induce soot disease. When spraying, it is necessary to spray evenly, and the branches, leaf surfaces, leaf backs, petioles, and fruit stalks should be sprayed to improve the control effect.

If it rains within 48 hours after spraying, it must be sprayed in time.

2. What pesticides are used to kill fruit tree scale insects

1. Use of drugs.

1) Chlorphosphine.

The drug is an ideal scale insecticidal agent, which can be used to control fruit trees, cotton, vegetables and other crops, and has a good effect on the prevention and control of sagittal scales, chaff scales, wax scales, mealybugs, brown round scales and other pests, and is a non-systemic insecticide, safe and efficient.

2) thiamethoxam.

The drug is a new structure of the second generation of nicotinoid high-efficiency and low-toxicity insecticides, which has multiple effects of stomach toxicity, contact killing, and systemic insecticide, and is mainly used for leaf spraying and soil root irrigation treatment. After use, it can be quickly absorbed by the leaves, conducted to all parts of the plant, and has obvious effects on stinging and suction pests.

2. Pay attention to the problem.

The control of fruit tree scale insects should grasp two key periods, one is from the sting to the bud germination, and the other is from the egg hatching period to the nymph stage. In these two periods, the shell and waxy layer of the scale insect were not formed, and the insect body was extremely sensitive to the agent, and the control effect of the agent was better at this time.

The common ones are: paramecium, cotton scale, Kang's mealybug, Japanese turtle wax scale, Japanese turtle wax scale, mulberry white scale, pear round scale.

Prevention and control method: use 50 ml of vinegar, soak the small cotton ball in vinegar, and wipe the wet cotton ball on the stems and leaves of the damaged flowers and trees, this method has a certain control effect.

Fruit tree scale insect is a kind of insect pest that occurs during the growth of fruit trees, mainly including mulberry white scale, persimmon scale, pear round scale, paramecium, etc., which seriously affects the quality and yield of fruits. It needs to be controlled during the growth period, when the insects are extremely sensitive to pesticides, which is a critical period for control. Once the nymphs are fixed, they will soon secrete wax to protect the insect body, and the chemical control effect will decline, so it is necessary to seize the critical period of prevention and control, choose effective agents, and control the harm with only one medicine.

Strengthen orchard management, timely fertilization and irrigation, meet the needs of fruit trees for water and fertilizer, and improve the insect resistance of fruit trees.

Combined with plastic pruning, burn the insect-bearing branches.

Summary. Dear, I am glad to answer for you: what pesticide is used to prevent scale insects in April: the pesticide that can be used is pyripropyl ether. Pyripropyl ether has high activity against scale insects, is used scientifically, and has an effective period of more than two months.

Dear, I'm glad to answer for you: What pesticide is used to prevent scale insects in April: The pesticides that can be used are pyripropyl ether. Pyrino propylene ether has high activity against scale insects and early opening, scientific use, and the effective period is more than two months.

Pyripropyl ether belongs to the insect chitin synthesis inhibition agent, which can not only treat scale insects, but also effectively kill the eggs of thrips, aphids, psyllids and other pests, and truly achieve multiple treatments with one drug. After using pyripropyl ether two or three times in a row, the scale insects are gone, and the number of small insects such as aphids and thrips is also very small in the later stage! It is recommended to use 100g of 100g of pyridyl ether EC 1000-1500 times with acetamiprid spray, and completely kill the worms 10 to 15 days after use!

Spirofen ethyl ester is another special effect ingredient of **scale scale insects, but the cost is high, it prevents scale insects mainly because of its super systemic insecticidal effect, which can be transmitted in both directions in the plant, and also belongs to the category of slow insecticidal speed, 10-15 days to completely kill insects! When using spirometallethyl ester, it is generally recommended to use 1500-2000 times of spirolexethyl ester suspension, in order to improve the quick effect, it is recommended to use acetamiprid, cis-cypermethrin and other ingredients!

Spring fruit tree insect control can be sprayed with stone sulfur mixture, which can be sprayed around the fruit trees before germination in the spring to reduce the breeding of pests and diseases. To prevent fruit trees from developing pests and diseases, it is necessary to disinfect the soil before planting, expose it to sufficient light, and properly prune overly dense branches to reduce the breeding of pests and diseases.

Spring fruit tree insect control can be sprayed with stone sulfur mixture, which can be sprayed around the fruit tree before germination in the spring. Stone sulfur mixture can effectively reduce the breeding of insect pests and improve the quality of fruit trees, so that fruit trees can produce higher yields.

If you want to prevent fruit trees from producing insect pests, when planting fruit trees, you need to use insecticides to sterilize and disinfect the soil, and stir the seeds in the fungicide before sowing, and then sow them, so that they can effectively prevent the breeding of pests and diseases after sowing, and also improve the germination rate of seeds.

During the maintenance of fruit trees in spring, sufficient light should be given to allow the fruit trees to receive light and photosynthesize, so that the fruit trees can grow more robust and resist diseases and insects. If there is a lack of light, fruit trees will not grow well and will be vulnerable to pests and diseases.

If fruit trees want to prevent insects in spring, they also need to be properly thinned, and some old branches, dead branches, thin branches and dense cross branches can be pruned off after disinfection, which will affect the ventilation and light transmission of the plant, and are also easy to breed diseases and pests.