Experts say that comprehensive control of citrus psyllids is the key, why do you say that?

Huanglongbing is a cancer of citrus plants, there is no way to prevent psyllids, I am a navel orange producing area in southern Gansu, and I have also suffered from Huanglongbing disease, only to cut down the diseased trees to first understand the way of infection with Huanglongbing: scion, seedlings, grafting, dodder seeds and citrus psyllids vector transmission. Long-distance transmission is mainly the transportation of diseased scion and susceptible seedlings, and short-distance transmission depends on citrus psyllids.

I am a native of Gannan and am rich in navel oranges in Gannan and am currently suffering from the harm of huanglongbing, which is a cancer of citrus plants that cannot be prevented. Detoxifying seedlings, building a net to prevent psyllids in the orchard, and using flying anti-spraying to kill psyllids, these measures are useless.

<> for the diseased trees found, one should be cut down, one piece should be cut down, and if a large scale is found, the entire orchard must be cut down, and burned after being cut. This place is not suitable for citrus in the future. On citrus trees, various aphids mostly occur in a mixed manner.

Aphids on citrus trees not only suck the sap from the young parts of the tree, but also transmit citrus tree viruses after transplanting. If you have a careful friend, you will find that if there are ants on the fruit tree.

Don't underestimate this aphid, it reproduces very quickly, the harm is great, if you don't spray in time, the citrus will not sprout, and it will not bloom, you will lose a lot! There are a lot of aphid adults and nymphs gathered together at the tender shoots of citrus and young leaves to suck the juice, and after the tender shoots are harmed, the leaves will generally shrink and curl, and the leaves will be seriously damaged, and the young shoots will wither.

Judging from this shape, it should be meadowsweet aphid, which may occur throughout the year, due to the low temperature resistance, it is more common on the early spring shoots, especially like to harm the new shoots that have just been drawn. In early spring, most of the garden plants have just sprouted, or just ready to flower, these shoots and flower buds are relatively poor, and aphids harm these young parts of the plant, so we must be careful when using drugs to avoid high drug concentration.

This is because this citrus is particularly susceptible to such pests, and the impact is also very large, and it can also affect yields.

Because this pest and disease has a very large impact on the growth of citrus, it is likely that there will be a large area of infection and death.

<>1. Prevention and control period: citrus psyllids are generally controlled in spring, summer and autumn. 2. Medication selection:

The available drugs are 20% fenvalerate emulsifiable concentrate 3000 times, engine oil emulsion 200-400 times, pine resin mixture 15-20 times, 5% Ruijin special suspension 1500 times, insecticide emulsifiable concentrate 2500 times, 25% Actai water dispersible granules 5000 times, nano mineral oil 200-350 times, 25% thiazinone wettable powder 1000 times, etc.

1. What medicine is good for citrus psyllid?

1. Prevention and control period.

1) The key period for the control of citrus psyllids is the period from the germination of new shoots such as spring, summer and autumn shoots to the development of leaves.

2) Generally, the first control is carried out when the new shoot germination grows to about 5cm, if the insect population density in the field is large, and the tip is not neat and the tip is not neat, resulting in the tip pulling period is too long, it is necessary to continue to carry out 2-3 times of control, and the interval time is about 7-10 days.

2. Medication selection:

1) The drugs that can be used for the prevention and control of citrus psyllids mainly include 1000-3000 times of 20% fenvalerate EC, 3000 times of 20% fenvalerate EC, 500 times of 40% niacinin sulfate + soap, 200-400 times of engine oil emulsion, 15-20 times of pine resin mixture, 1500 times of 5% Ruijin special suspension, 2000 times of 10% Dafeng Harvest WP, 2500 times of insecticide EC, 5000 times of 25% Actai water dispersible granules, 4000 times of 20% Bixico solution, 200-350 times of nano mineral oil, 2000-3000 times of 10% imidacloprid wettable powder, 1000 times of 25% thiazinone wettable powder, etc. (the above drugs are used alternately to avoid drug resistance).

2) When clearing the garden, you can use Baumé stone sulfur mixture to kill citrus psyllid eggs.

2. Symptoms of citrus psyllids

1. Hazard location.

Citrus psyllids are mainly harmful to Rutaceae plants, and the main damage parts are the young branches, young leaves and shoots of the plant.

2. Harmful symptoms.

1) Adults mostly feed on the shoots and the backs of the leaves, while nymphs gather on the shoots and leaves to feed. After the young shoots and shoots are damaged, they become dry and withered, while the young leaves become distorted and deformed after being damaged.

2) Nymphs tend to discharge white flocculent secretions, which cover the active area, which causes soot disease and affects the photosynthesis of plants, resulting in the weakening of trees and the decline of fruit yield and quality.

3) Citrus psyllids are the only vector insects that transmit citrus huanglongbing.

The biological control methods of citrus insect pests mainly use the three natural enemies of parasitism, predation and pathogenicity to control them.

To be specific, you can buy it.

For example, fungi ** can be bought?

Cultivation techniques can be adopted to prevent the occurrence of citrus psyllids, and the methods are: 1. Planting shelterbelts. to increase the shade of the orchard and make it unsuitable for psyllids; 2. Clean the orchard.

Remove dead branches and fallen leaves and weeds, dig up diseased or weak trees, and reduce the source of insects; 3. Strengthen cultivation management. Make the branches concentrated and neatly pumped to reduce the spawning and breeding grounds; Prune fruit trees in summer, leave branches reasonably, ensure ventilation and light, reduce the damage of the insect, remove the top leaves of the new shoots, take them out of the garden for treatment, and eliminate eggs and nymphs. 4. Take nine mile incense and the method of repelling.

Because the citrus psyllid is very sensitive to the "nine mile", as soon as it smells its smell, it will gather the letter to glide on the top to search the surface, so the "nine mile" that can be planted in the orchard, and then pour the systemic psyllid agent on it, and the psyllid will be poisoned after feeding on it. Or plant guava in the citrus orchard, because the guava has a good repellent effect on the citrus belt source psyllid, and drive the psyllid out of the orange orchard.

Can it be used in agricultural production?

Because the biggest harm of citrus psyllids spreads huanglongbing, and once huanglongbing is infected by the laughter, it is devastating to citrus, so the control of citrus psyllids must be as early as possible. It can be sprayed in winter and at each shoot stage, when the bud is 5 cm long after germination, and the new shoot is sprayed before and after touching. The potions are:

Shengfeng Xiangrui 15 ml + 10% imidacloprid wettable powder 3000 times, or 3000 times of insect mite light emulsifiable concentrate, 80% dichlorvos emulsifiable concentrate 800-1000 times, 25% chlorchlorpine emulsifiable concentrate 1000 times, etc.

Hello, you can.

My suggestion is to use the medicine at the best time after the vertical cover is harvested, when the garden is cleared in winter and spring, and when the shoots are fresh, while paying attention to protecting natural enemies and promoting biological control. One of the agents can be used in rotation: 20% imidacloprid wettable powder 2000 times liquid; 20% deltamethrin EC 1000 times; Lvying stuffy 200-250 times liquid + Shengfeng Xiangrui 1500 times liquid; 90% trichlorfon crystal remaining 800 times liquid; 80% dichlorvos emulsifiable concentrate 800-1000 times.

Hello, guava does not bear fruit, can it also repel psyllids? I'm from Hunan, and I've planted a pomegranate, and I don't think it will bear fruit.

Ask about custom messages].

Hello, guava volatiles have a slowing and avoiding activity against citrus psyllids, and can also interfere with the pickpocketing behavior of the chister, thereby affecting the transmission rate of citrus huanglongbing!

Old knife note: Citrus psyllids have obvious tenderness, and adults and nymphs suck the juice on the young shoots and young leaves of citrus, causing deformation and distortion of the young shoots and young leaves.

Citrus psyllids have obvious tenderness, and adults and nymphs suck the juice on the young shoots and young leaves of citrus, causing deformation and distortion of the young shoots and young leaves. Nymphs excrete white matter from the hilum of the liver, which can cause bituminous coal disease. Citrus psyllids are vector insects of citrus huanglongbing, and the control of citrus psyllids is the key to control and alleviate citrus huanglongbing.

Generations overlap in the field, with adults overwintering in the leeward of the canopy. The spring shoot stage is the first peak period for the reproduction of citrus psyllids. The first summer shoot extraction, especially juvenile citrus, became the second peak stage of citrus psyllid infestation. The autumn shoot period is the period of the year when the insect population density is the highest and the most severely damaged. When the adult is resting, the tail is cocked and is at an angle of 45° to the resting surface.

Because the diseased and weak trees germinate first in spring every year, the adult adults of the overwintering citrus psyllid are the first to be harmed on it, and the tail lays eggs, and reproduces the first generation of nymphs.

Control methods: low temperature in winter, citrus psyllid activity is weak, is a favorable time to carry out control, winter garden spraying to eliminate overwintering adults.

Strengthen fertilizer and water management, maintain the growth of citrus trees, insist on wiping buds and shoots (summer shoots can be removed in orchards during the peak fruit period), erase late autumn shoots, and promote citrus trees to be neatly put down, which is conducive to unified spraying. Cut down weakened trees that have lost their ability to bear fruit and reduce the source of insects.

The requirements for planting varieties in the orchard are consistent, which is convenient for unified management and control. Focus on the "three shoots" extraction period for prevention and control, generally the first time to prevent and control when the new shoots sprout to the bud length of 5cm, such as the base of the insect population is large, the shoots are not neat, and it is necessary to prevent and control 2-3 times, with an interval of 7-10 days. Under normal circumstances, spring shoots are controlled 1 time, summer shoots 1-2 times, autumn shoots 2-3 times, and more than 4 times a year, which can basically control citrus psyllids.

Agent: 2% avermectin EC 2000 times, 48% chlorpyrifos EC 1200-1500 times, 10% imidacloprid WP 2500-3000 times, 50% dimethoate EC 800 times. The diseased plant must be sprayed once before digging to prevent the psyllid from migrating outward.