What is the annual occurrence pattern and living habits of pear psyllid? How to prevent it?

Pear psyllids generally occur in 6-7 generations in 1 year, and often emerge in 2-3 months. The time for prevention should be in winter, scraping off the old bark to prevent it.

The occurrence pattern of pear psyllid is 3 to 5 generations in 1 year in Northeast China before the fruit tree matures every year. The prevention and control measures are to clear the garden, fill the frozen water, scrape off the old bark, and prune in winter.

Pear psyllids occur every year, a normal phenomenon, so how to prevent it, destroying its living environment and the nutrients he needs can prevent pear psyllids.

Pear psyllids mainly harm pear trees, adults and nymphs absorb the sap of pear tree shoots, twigs, leaves, buds, and fruits for life, and the leaves are formed after necrotic spots, which can lead to early leaf fall of pear trees, and young fruits can lead to fruit drop after being harmed, and at the same time secrete a large amount of honeydew when harmed, resulting in pollution of leaves, young fruits and other organs to turn black, resulting in pear trees can not grow healthily.

The following measures can be taken to prevent and control pear psyllids, and the specific measures are as follows:

1. Agricultural prevention and control technology. After the pear tree is harvested, combined with the winter garden clearing, the fallen leaves, diseased branches and diseased fruits are taken out of the field in time to be destroyed or buried deeply, so as to reduce or eliminate the overwintering adults.

2. Scientific control technology of high-efficiency, low-toxicity and low-residue pesticides. In the prevention and control of pear psyllid, we must grasp the key control period, which is the sting period of overwintering adults and the incubation period of a generation of nymphs.

The control agent can choose 12% avi clothianidin suspension 3500-5000 times, or 24% avi clothianidin suspension 3000-5000 times, or 20% spirodifenidin suspension 3000-4000 times, or 5% avi imidacloprid suspension 2000-3000 times, or avi mineral oil emulsifiable concentrate 1500-2000 times and other agents for prevention and control.

3. Precautions for prevention and control. Protective clothing should be worn when applying pesticides, and the liquid should be avoided from drifting to other crops to prevent pesticide damage, and attention should be paid to the safety interval of pesticides and the number of pesticide applications. For example, when the 12% avi spiroesterin suspension grown by Helier Pharmaceutical Group Co., Ltd. is used to control pear psyllids in pear trees, the safe interval for use on pear trees is 7 days, and the crops can be used at most once per season.

And this agent is toxic to silkworms, fish, bees, (around) flowering plants are forbidden during flowering, silkworm room and mulberry garden are prohibited, away from aquaculture areas, rivers and other water bodies.

No matter what pesticide we use, we must read the pesticide label carefully, use it scientifically and rationally according to the instructions of the pesticide label, and at the same time avoid environmental pollution and damage to the environment to the greatest extent and reduce pesticide residues.

During the dormant period of pear trees, artificial control is the mainstay, combined with pruning, to scrape off the old and useless rough bark, and to eliminate the overwintering insects hidden under the old bark.

Artificial control, drug prevention and control and the use of natural enemies for prevention. Hang up the old bark during overwintering to eliminate overwintering adults. When the overwintering adults do not lay eggs, spray the agent.

Pear psyllids can be controlled with avermectin, spiroethyl ester, pymetrozine, nicotine, matrine, avi mineral oil emulsifiable concentrate and other drugs, and it is best to use them in turn to avoid drug resistance. This pest is a common pest, mainly harming pear trees, strong reproductive ability, when found, it is necessary to treat it with medicine in time, so as to avoid aggravation of pests and hinder growth.

Psyllachinensis is a species of the phylum Arthropods, Jawed Subphylum, Hexapodidae, Insecta, Winged Subclass, Homoptera, Psyllid Suborder, and Psyllididae.

It is the main dominant population in China's pear producing areas, distributed in Liaoning, Hebei, Shandong, Inner Mongolia, Shanxi, Ningxia, Shaanxi and other places. Chinese pear psyllid mainly harms the leaves, fruits and young parts of the branches of pear trees, weakens the tree, and in severe cases, causes a large area of early defoliation of pear trees, which directly affects the growth and development of pear trees and the yield and quality of fruits. In recent years, the insect has become more and more serious in orchards in northern China, and the fruit damage rate of heavy pear orchards is close to 100%, which seriously affects the economic benefits of pear tree production, and has become the most serious pest in pear tree production, which is one of the key problems that need to be solved urgently.

Pear psyllids are most afraid of insects such as ladybugs, grass ridges, parasitic wasps, etc., which are the natural enemies of pear psyllids, and after finding pear psyllids on fruit trees, they can catch these insects and put them on fruit trees. **Pear psyllids on fruit trees can also be sprayed with avermectin and acemethamidophos soluble granules**, but it is best to dilute the agent with water before spraying.

Fruit trees are easily infected with pear psyllids during the growth process, and some people will ask what pear psyllids are most afraid of, pear psyllids are most afraid of ladybugs, grass ridges, parasitic wasps and other insects, which are the natural enemies of pear psyllids. When pear psyllids are found on fruit trees, you can place these bugs on the fruit trees, and these insects will eat the pear psyllids on the trees.

Pear psyllids usually appear in winter and summer every year, and if you can't catch insects, you can spray avermectin and acemethamidophos soluble granules on the tree**, and it is best to dilute the agent with water before spraying to reduce the concentration of the agent. It is best to spray fruit trees in the morning or evening on a sunny day, and try not to spray in the middle of a sunny day or a rainy day.

Spraying the agent at high temperature will reduce the efficacy, and spraying the agent in rainy days will wash away the agent in rain, and the spraying effect is the same as not spraying. Usually the fruit can not be sprayed half a month before the fruit is ripe, at this time the spray may enter the human body with the fruit, if you must spray, it is best to avoid the fruit.

Pear psyllids like to grow in a hot and dry environment, after the fruit tree is infected with the pear psyllid, you can cut off the branches and leaves that have been diseased and then spray the drug, and if you feel that the chemical agent is not good for the fruit tree, you can make your own medicine at home. When self-medicated, the plant ash can be diluted in water at a ratio of 1:15, and the plant ash can be used after filtration after dissolving.

First of all, we must clean up the weeds, and then choose pesticide spraying to prevent insect pests, drain water in time, and loosen the soil.

First, the pear psyllid was controlled at the sting stage, then at the first generation nymph stage in April, and then at the first generation adult stage in May, so as to alleviate the insect infestation.

In early spring, scrape the bark, sweep the residual branches and weeds in the pear orchard to eliminate the overwintering adults, spray the corresponding pesticides to kill the pear psyllid during the active period, or spray 5% permethrin 2000 times in the first generation of larvae after the pear tree falls flowers.

1. If you want to kill the pear psyllid, you need to use its natural enemies to remove, the natural enemies of the pear psylloid are parasitic wasps, grass ridges, ladybugs and small flower bugs and other insects, and they are also the Kunna key worms that the pear psyllid is most afraid of, and they can also have a certain control effect on the pear psyllid.

2. What agent is the pear tree cherry lice most afraid of? The focus of pesticide control is to spray pesticides in the stinging period of overwintering adults, that is, mid-March and the peak hatching period of the first generation of nymphs, from late April to early May. 10% imidacloprid wettable powder and 5% acetamiprid soluble powder can be used.

3. Control heart-eating insects and aphids by means of sexual trapping, sweet and sour trapping, branch coating and other methods from 4 to 6 months of oviposition parasitism, and avoid spraying with pesticides to protect jumping wasps; It is also possible to collect parasitic pear psyllid nymphs in September, store them in a cryogenic box, and take them out and release them in early April of the following year.

Summary. Pear psyllids are generally absent from late September to October.

Pear psyllids are generally absent from late September to October.

There are two important periods of the year for infiltration control of pear psyllids: first: before and after the annual sting.

At this time, the prevention and control has the effect of twice the result with half the effort, saving time, saving trouble, and the effect is good, and this is the most important prevention and control period of the year. Second: from May to June, before and after the wheat harvest, that is, the second generation, is the rampant occurrence period of pear psyllid, which is the second important period for the prevention and control of pear psyllids throughout the year, mainly to reduce the population base of pear psyllid.

Because it is difficult to control it in the third generation, the overlapping generations of pear psyllids in the third generation are serious, resulting in the coexistence of each insect state of the pear psyllid in the interridge segment, and it is difficult for us to kill all the insect states at the same time. Therefore, measures should be taken to control the base of the insect population in May 2nd. For prevention, egg killing should be the mainstay, and the eggs and nymphs should be best used during the hatching period.

If there are fewer eggs and fewer nymphs, then the adults will naturally not be able to form a major disaster.