What pesticide is used for pears to rot? What kind of medicine is used to treat common pests and dis

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Pear ring disease. The lesions of the fruit are all centered on the skin pores, and they are water-stained light brown to reddish-brown round rot spots at first, and the lesions are expanded.

In the process, concentric rings alternating light brown and reddish-brown to dark brown are gradually formed. The lesion tissue is soft and juicy, without special odor, not depressed in the early stage, slightly depressed in the later stage, and gradually produces scattered small black spots (conidia) from the middle of the lesion.

Prevention and control: 1. Removal of germs Removal of germs is the key and foundation for the prevention and control of wheel pattern disease, and the following aspects should be grasped: Scraping.

Remove disease spots on the branches. Herbs for branches. Spraying eradicating agents during the dormant period can directly kill the overwintering bacteria on the surface of the branches, which can significantly reduce the amount of bacteria in the orchard.

Commonly used agents include 40% formarsine, 95% fine solibar, 40% stone sulfur mixture crystal, 1 3 obe stone sulfur mixture, etc. Clean up dead branches.

2 Prevention and control of pesticides in the susceptible period of fruit Starting from the pear flowering, spray in time according to the rainfall. The effective agents are: 50% carbendazim, 70% thiophanate-methyl, 80% Dasheng M % spray.

When taking medication, it is necessary to pay attention to the coordination with the prevention and treatment of scab, and try to consider the treatment of the two main diseases.

3 Pre-harvest spraying The main cultivars in the production rarely develop diseases before harvesting, and the pathogens are latent around the pores, and the use of 1 3 times of high concentration of systemic agents before harvest may eradicate part of the cortex carriers and reduce the incidence after harvest. The more effective formula is 85% 400 times of Plague Frost + 50% carbendazim 500 times + 1000 times of killing or harming Liping.

4 Fruit bagging Spray 1 3 times of 80% Dasheng M-45 or 80% spray gram after flowering, etc., and at the same time carry out fruit thinning, fruit fixing, and fruit bagging after fruit setting, which can basically control the harm of the disease.

It should be infected with a certain fungus, use chlorothalonil or something, related drugs, but it is rotten, it is useless, and doing a good job of disinfection and sterilization next year is your main task at present.

Pear scab disease mainly harms all green and tender tissues in the shoots of pear trees, such as fruits, leaves, shoots and flowers, and can be harmful from flower drop to near-maturity of fruits. After the onset of the disease, the main feature is the formation of an obvious black mold layer in the diseased part, much like a layer of moldy smoke, and finally the inflorescence and leaf clusters die, the leaves fall early, the new shoots dry up, and the fruit is deformed, cracked, rotten and other symptoms.

Prevention and control agent: spray 100 times of the liquid or 3-5 degree leaching stone sulfur mixture during the bud germination period. After the onset of the disease, spray enazole wettable powder 2000 3000 times, mycloconazole 3000 times, Fuxing 10000 times. To prevent the development of resistant bacteria, it is best to rotate with protective agents such as Bordeaux liquid and mancozeb.

Pear rust and pear scab: At the end of pear tree flowering, timely use of medicine spray to prevent and control. The agent can be selected with 15% powder rust 1500 times solution or 45% Dasheng 800-1000 times solution, plus 105 times high 6000 times solution.

For the common pests and diseases of pear trees, it is better to use some big brands of pesticides, because the quality of big brands of pesticides is clear.

At this time, you can spray some pesticides to prevent pests and diseases on the pear tree, and you can also use some chemical sprays, which can remove pests and diseases very well.

Early April: Cypermethrin (2000 times liquid) can be sprayed. Early to mid-May:

It can be sprayed with 10% difenoconazole + 10% imidacloprid + avermectin. Mid-June: 25% bromonate + avermectin + cypermethrin can be sprayed.

At the beginning of July: it can be sprayed with Yibao Water Dispersible Granules + 25% Chlorpyramide No. 3.

January and early April.

1. Medication method: 40% Fuxing (8000-10000 times liquid) can be sprayed at the early flowering stage to improve the calyx removal rate of pear trees (pears); Insecticides can be sprayed with cypermethrin (2000 times liquid).

2. Control object: pear psyllid adult and other pests.

February, early to mid-May.

1. Medication method: 10% difenoconazole (3000-4000 times solution) + 10% imidacloprid (2500 times solution) + avermectin (2500 times solution) can be sprayed.

2. Prevention and control objects: pear tree scab, pear tree ring disease, pear tree elephant, pear psyllid and other pests and diseases.

March and mid-June.

1. Medication method: 10% difenoconazole (3000-4000 times solution) or 25% bromoconazole (300-500 times solution) + avermectin (2500 times solution) + cypermethrin (2000 times solution) can be sprayed.

2. Prevention and control objects: ring disease, scab, anthracnose, pear psyllid, pear heartworm and other pests and diseases.

April and early July.

1. Medication method: It can be sprayed with Yibao water dispersible granules (1500 times liquid) + 25% chlorpyramide No. 3 (2000 times liquid).

2. Prevention and control objects: anthrax, ring disease, scab, pear psyllid, mealworm and other pests and diseases.

May, mid to late July.

1. Medication method: 70% Dysenlian (800 times liquid) + 43% tebuconazole (3000 times liquid) + 40% chlorpyrifos (1500 times liquid) can be sprayed.

2. Prevention and control objects: anthracnose, ring disease, scab, pear heartworm, mealworm and other pests and diseases.

Before flowering:

Before the flowering of pear trees, it is a critical period for the control of pear bees and pear psyllid adults, spraying deltamethrin 2000 times or kung fu pyrethrin 2000 times, and at the same time treating pear aphids.

After flowering: spraying begins when 80% of the flowers fall, 10% imidacloprid powder 3000 times + 2% avermectin 2000 times + propylene zinc 800 times, which can control pear psyllid, mealworms, black spot disease, etc. This is a key medicine, and it must be sprayed well.

10-15 days after the pear tree falls flowers, the whole tree is sprayed with 800 times carbendazim and 1000 times cypermethrin mixed solution twice, with an interval of 7 days, mainly to prevent scab, mildew, scarab, chunxiang, etc. If 1500 times of imidacloprid is sprayed, it can also treat leaf miner ticks, psyllids and aphids.

Extended Information: Technical Essentials of Pear Tree Flowering Management:

1. Pollination. Many varieties of pear trees are self-flowering, or require assisted pollination or bee pollination due to poor pollination, due to small and deformed fruits. Artificial pollination is carried out in the full flowering period, with a feather duster first rolled on the pollinating tree, stained with pollen, and then transferred to the main cultivar and gently rolled.

Bee pollination is a box of bees for every 10 acres of pear orchards.

2. Thin flowers and fruits. Flower thinning should be done in the early stage of flower bud expansion or in combination with pruning. When pruning, the fruiting branches should be appropriately pruned for trees with many flower buds to reduce the ineffective consumption of flowers and nutrients in the next year.

Fruit thinning should be completed within half a month after fruit hanging. One inflorescence leaves one fruit, the leaf-to-fruit ratio is 25-30:1, and the interval between fruits is 25 cm.

Armpit flower sprout fruits, diseased and insect fruits, and dorsal fruits of thick branches should be all thinned.

3. Bagging Fruit bagging can effectively prevent pests and diseases, reduce pesticide pollution, and produce high-grade and high-quality fruits with thin skin, smooth and clean, beautiful and fine flesh. Fruit thinning is performed from late April to early May.

Spray high-efficiency fungicide before bagging, with 2000 times of pyrethroid insecticide and 1500 times of methyl tobuzin as well, and bag with spraying. Fruit bags can choose 50g single-layer blue and black paper bags. Medium and long-term storage can be used in 40 grams of blue-black paper bags.

After setting the fruit, clamp it with iron wire. After bagging, fertilizer and water management should be strengthened.

Pear tree spraying is to control pests and diseases or to protect flowers and fruits to promote growth, as long as you figure out why and what to do, you can choose what to spray.

The main diseases on the pear tree are pear scab, rust, ring disease, rot disease, etc., and the main insect pests are pear heartworm, small heartworm, hawthorn leaf mite, pear stem bee, pear aphid, pear psyllid, pear round scale, mites, etc., you can choose the right road pesticide according to the control object timely control.