What kind of pests do you have that harm pear trees?

The common insect pests of pear trees include pear psyllid, pear yellow mealype, powdery mildew, rot disease, leaf spot, black spot, pear rust, pear net bug, stinging moth, etc. Pear tree black spot disease is one of the main diseases in the southern pear producing area, mainly harming pear leaves and fruits, it is necessary to strengthen fertilizer and water management, enhance tree potential, timely remove diseased fruits, diseased leaves and prune diseased shoots, and concentrate on burning.

Introduction to pear rust

Pear rust infects young leaves, young petioles, young fruits and young fruit stalks, seedlings, etc., in the early stage of the disease, there are orange-yellow dots of needle tip size, and after enlargement, the middle of the lesion is orange-yellow, the edge is light yellow, and the outermost is light greenish yellow, and then turns red.

Pear rust must be parasitic to complete its life cycle, and the presence or absence of intermediate hosts such as juniper is a prerequisite for the occurrence of rust, so there should be no juniper around the newly built pear orchard.

Introduction to the pear binary aphid

Pear bifurcated aphids swarm on buds, young leaves, and young shoots to absorb pear juice, and nymphs concentrate on green buds in early spring, and invade the buds as the pear buds bloom.

In areas where there are natural enemies for stocking, ladybugs and lacewings can be released to feed aphids and protect aphids, aphids and other natural enemies.

Summary. Hello <>

The enemy on the pear tree kills the pear psyllid.

Hit the enemy on the pear tree to kill what insects to kill.

Hello <>

The enemy on the pear tree kills the pear psyllid.

Killing enemies is a commonly used pesticide that contains active ingredients that can kill pear psyllids and other pests, and has a long residual effect, which can continue to protect pear trees for a period of time. When a large number of pear psyllids are found on the pear tree, the effective control effect can be achieved by killing the enemy. However, when using anti-enemy killing or other pesticides, it is necessary to note that they should be used correctly according to the guidance of the instructions to avoid unnecessary harm to the environment and the human body.

In addition, in order to maintain the ecological balance, biological control measures, such as the introduction of natural enemies, can also be tried to control the population of pear psyllids. [Grip the key or slap the hand].

Common pests in the process of pear tree planting are: blue-and-yellow-eyed beetle, star beetle, xylum codling moth and pear-patterned gilding. It can mainly be prevented by spraying.

It is recommended that during the oviposition period and larval hatching period of adults, spray 1000 times of 80% dichlorvos emulsion or 2000 3000 times of dichlorvos emulsifiable concentrate every 10 days, and spray pesticides such as octathion, larvaluride, and fruit worm net to kill adults, eggs and larvae.

1. Pruning and thinning in time, ventilation and light transmission, and improving plant stress resistance; Before the onset of the disease, 1 bottle of mother liquor and 30 kg of dilution were added to the water of the tree protection general, and the tree body and ground were fully sprayed for disinfection, and the medicine was used once every 15 days; After the onset of the disease, the diseased plants are cut down and burned in time to reduce the pathogen.

2. Strengthen the management of young trees, so that young trees can grow vigorously and enhance their ability to resist diseases; Scrape the lesions in time and apply them with the original solution of Ulcer Spirit; Combined with winter and summer pruning, remove diseased branches and fruits in time and burn them in a centralized manner.

3. Do a good job of clearing the garden in winter to reduce and eliminate the source of infection; Before germination, scrape the lesions on the branches and burn them to reduce the initial infection of the pathogen**; Spraying eradicating agents during the dormant period to directly kill germs; Fruit bagging can effectively prevent fruit rot.

4. Spray the tree protection general plus 5be stone sulfur mixture mixture before the tree germination in the seriously ill garden, and spray 200 times lime multiples Bordeaux solution again after flowering, or 1000 times of 50% dyceammonium solution, 600 to 800 times of antibacterial special wettable powder, 1000 to 1500 times of 10% polyoxymycin wettable powder, but the application can not be more than 3 times a year.

5. Spray 100 times the solution of the general before the pear tree germination, or Baume 5 degrees stone sulfur mixture.

6. Commonly used agents are: 50% parathion emulsion 1500 times, 50% phoxanthion emulsion 1000 times, 50% pine borer emulsion 1000 times, 50% malathion emulsion 1000 times, 50% dichlorvos emulsion 1000 times and 20% pyrethrin emulsion 3000 times, the above pesticides and new high lipid film combined alternate spraying effect is better.

(1) Pear psyllid. The larvae and nymphs suck the sap of the young parts of the plant, which indirectly affects the quality and yield of pears. Attention to the prevention and control of pear psyllid:

Eggs are removed in winter; Timely removal of diseased and residual plants and branches with insect sources; The use of drugs for prevention and control, such as imidacloprid, avermectin, pyridoxone, etc.

2) Pear aphids. It mainly harms the young leaves of the pear tree so that it can not carry out photosynthesis well, and the newly grown branches on the pear tree are more seriously damaged. Its control method is basically the same as that of pear psyllid, which can be referred to the control method of pear psyllid.

3) Pear heartworm. Contains pear heartworm and pear heartworm. These two kinds of heartworms are the main damage to the fruit, the pear is small and the fruit is easy to rot and fall off, while the pear is easy to form dry fruit and stiff fruit, which does not fall off when hanging on the tree.

Its control can be controlled by contact pesticides to control larvae, and systemic agents to control adult insects.

The most troublesome are the pear heartworm and the pear heartworm, as well as the pear tree weevil.

Pear diseases and insect pests, mainly pear rust, can be sprayed with 1:2-3:200 times Bordeaux liquid when the pear tree begins to sprout and spread leaves; In the early stage of the disease, spray 50 methyl tobuzin 700 times into 25 carbendazim 500 times; Pear spot disease, after the pear tree flowers, spray 1:

2: 200-240 times Bordeaux liquid. During the rainy period, spray 1:

2: 200 times Bordeaux liquid; pear stem wasp, spray 50 parathion 2000 times liquid at the early flowering stage; Pear star caterpillar, in the overwintering larvae stinging, budding damage period, spray 50 p-thion emulsifiable concentrate 2000 times. When the insect infestation is serious, spray the same concentration of agent after flowering; Pear psyllid, before the overwintering generation of adults to lay eggs, spray 50 p-thion emulsifiable concentrate 1000 times, stinging moth and pear leaf roller moth, in the larval occurrence stage, spray 80 dichlorvos emulsion 1000 times.

During the adult stage, light trapping is carried out.

There are many kinds of pests of pear trees, but they occur widely, and there are more than 20 kinds of pests. The main pests that damage the fruits of DAO are heartworms (such as pear heartworm, peach heartworm, pear heartworm), Tsubaki (such as pear Tsubaki, tea wing Tsubaki), pear weevil, pear bee, yellow mealy aphid, etc. For the pests of branches, new shoots and leaves, the common ones are caterpillars (such as pear star caterpillar, canopy caterpillar, stinging moth), beetles (such as apple hairy beetle, green beetle), aphids (such as pear bifurat aphid), mites, scale insects, pear psyllid, pear net chun, pear stem bee, golden edge gilding worm and so on occur from time to time in some areas.

In the pear orchard where more attention is paid to the control of pesticides, heartworms, caterpillars, beetles and other pests occur very rarely, and they can be basically controlled. If the drug or control method is improper, there are too many natural enemies, which will cause the occurrence of mites, aphids, pear psyllids, Tsubaki, scale insects and other pests, which will aggravate the damage. Therefore, the combination of pesticide control and manual control is very important, which not only protects natural enemies, reduces pesticide pollution, saves costs, but also obtains good insect control effects.

1. Pear tree rot disease is mainly to damage the bark of the main branches and side branches, causing rot. There are two types of symptoms: ulcer type and branch withering type, and in severe cases, a large number of dead branches appear until death. In the prevention and control, it is necessary to strengthen the management of orchards, control the amount of fruit set, improve the disease resistance of trees, and select disease-resistant varieties.

Cut off the diseased branches in time, scrape off the scars, burn them in a centralized manner, and apply 30 to 60 times of Fumei arsenic wettable powder. Before the pear tree germinates, spray 40 times of Fumei arsenic wettable powder 100 times or 100 times of rotten enemy, or Baume 5 degrees of stone sulfur mixture.

2. Pear black spot disease is a common and frequent disease of pear trees, mainly harming fruits, leaves and new shoots. In Liaoning Province, leaf spots generally appear from late April to early May, with an average temperature of 13 to 15 o'clock, and the disease is most severe from May to June. The fruit generally begins to develop in early May, cracks and falls off in mid-June, and drops the most fruit in late July.

The key points of prevention and control are to strengthen cultivation management, increase the application of organic fertilizer, and avoid partial application of nitrogen fertilizer. Combined with winter pruning, remove dead branches, fallen leaves and diseased fruits in the garden, and bury them deeply. Spray sodium pentachlorophenol plus 5be stone sulfur mixture mixture before germination of the tree body in the seriously ill garden, and spray 200 times lime double Bordeaux solution again after flowering, or 1000 times of 50 dycenummonium solution, 600 to 800 times of antibacterial special wettable powder, 10 polyoxymycin wettable powder 1000 to 1500 times of solution, but the application can not be more than 3 times a year.

The alternating use of these agents with Bordeaux liquid can improve control effectiveness and reduce costs.

3. Pear star caterpillar is the main leaf-eating pest of pear trees, with larvae as the pest of flower buds, flower buds and leaves, which can occur twice a year, generally from March to April and August to September. The overwintering larvae emerge from the stinging period is the appropriate period for control, that is, the flower buds of pear trees are exposed to the inflorescence separation stage. Commonly used agents are:

50 parathion emulsion 1500 times, 50 phosphine emulsion 1000 times, 50 pine borer emulsion 1000 times, 50 malathion emulsion 1000 times, 50 dichlorvos emulsion 1000 times and 20 pyrethrin emulsion 3000 times.

Fourth, the pear peak (commonly known as the flower drill, white diamond insect) is only harmful to the pear tree. Adults lay eggs in the calyx, and the larvae initially feed in a ring in the base of the calyx, and after the damage turns black, they bury into the heart of the fruit, so that the young fruit withers and falls off. The larvae crawl out before fruit drop and turn to other young fruits.

The insect produces one generation a year, and the mature larvae overwinter in the soil as cocoons. Adults emerge and lay eggs from late April to early May, and the peak oviposition period is when the inflorescence of the pear tree is separated to the petals and ready to be released, and the larvae are damaged by fruit borers in mid to late May.

During the prevention and control, the feigned death of the adult insects can be used to receive a cloth sheet under the canopy, vibrate the adults to kill, or manually remove the eggs and young fruits during the oviposition period. 10 to 15 days before the flowering of the pear tree, when the adults emerge from the soil, spray the ground with 25 p-thionine 300 times, 25 octathion 300 times or Lesben emulsifiable concentrate 600 times, focusing on the trunk circumference of 1 meter.