What pesticides are good for controlling early defoliation of apple trees?

The early defoliation control of apple trees can be sprayed on the tree body and the ground before germination with 5 degrees of stone sulfur mixture to eliminate overwintering bacteria, 7-10 days after flowering with ** fungicides, such as 43% Haolik 5000 times spraying, before bagging the selection of fungicides as above, and add insecticides and calcium supplement liquid spraying, after the bagging of protective fungicides, such as 50% Antaisheng 800 times liquid.

Pesticide control of early defoliation disease in apple trees (1) 1:2:200 (copper sulfate 1 kg:

2 kg of quicklime: 200 kg of water) Bordeaux liquid spray, spray once every 15 to 20 days. (2) 80% mancozeb wettable powder 800 times + 70% thiophanate-methyl water dispersible granules 1000 times + cyfluthrin water emulsion 2000 times + avermectin emulsifiable concentrate 4000 times spray.

3) 43% tebuconazole 5000 times or mycloconazole 4000 times + 25% chlorpyramide 1500 times spray. (4) 50% ethylphosphine aluminum-manganese-zinc wettable powder 800 times + 5% hexaconazole wettable powder 2000 times + 40% chlorpyrifos emulsifiable concentrate 1500 times + 20% pyridafen powder 3000 times spray.

Control early defoliation of apple trees.

To prevent brown spot disease, gray spot disease, round spot disease, and round spot disease (big star disease), it is mainly sprayed with 1200-1500 times of Yibao, 600-800 times of fierce killing, Dasheng, and agricultural resistance 120; **The drug is mainly sprayed with 8000-10000 times Fuxing, Metropia, carbendazim, prochlorbendazim, etc.

To prevent spotted defoliation, the main sprays are 1200-1500 times of Yibao, 600 800 times of fierce killing, 120 times of agricultural resistance, Pudejin, etc. The combination of prevention and ** is mainly sprayed with 8000-10000 times Fuxing, 5000-7500 Jinlux, 3000 times Wanxing, 600-800 times sterilization, promethin, promephazim, etc. Fungicides for the prevention and control of other early defoliation diseases, such as Bordeaux liquid, Tropium, and carbendazim, have poor control efficacy, so they often cause serious losses.

Time of onset. Early defoliation of apple trees begins in June, is more common in July and August, and decreases after August. Rain and fog are the main conditions for the epidemic of the disease.

In years with early and abundant rainfall, the onset is early and severe, and in spring and drought years, the onset is late and light, and in some areas there is little rainfall, but the fog and dew are heavy, and the onset is also severe. The strength of the tree has a great impact on the disease, the strong tree is mildly diseased, and the weak tree is seriously diseased; The young tree is mildly diseased, and the fruiting tree is seriously diseased; The soil layer is thick and lightly diseased, the soil layer is thin and the disease is serious, and the lower part of the crown is more sick than the top; Suffering from other pests and diseases and pesticide damage, the disease is also more serious.

Prevention and control methods. 1. Do a good job in clearing the garden. In autumn and winter, the fallen leaves in the garden are cleaned, and the remaining diseased branches on the trees are removed by pruning, and the manure is concentrated on production.

2. Strengthen cultivation management. Apply more organic fertilizer, in accordance with the principle of nitrogen control, phosphorus and potassium increase, rationally use chemical fertilizer, and pay attention to foliar fertilizer. At the same time, the scientific implementation of large-scale renovation measures, improve the ventilation and light transmission conditions of the orchard, strengthen the prevention and control of other pests and diseases, so that the fruit trees grow robust and improve the ability to resist diseases.

3. Spraying protection.

There are many effective agents for the prevention and treatment of early defoliation, and practice has proved that 80 Bideli MZ-120600 is 800 times, 80% mancozeb (Dasheng M-45, Taisheng, Bideli MZ-120) wettable powder is 800 times, and 10 times high water dispersible granules 2

000 times, 25 true high microemulsion 10

000 times, easy to retain water dispersible granules 1

500-fold, 70-methyl tobuzin1

500 times, 50 carbendazim 800 1

The safety of 000 times and other agents is very good.

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Summary. Hello, glad to answer for you.

There are many reasons for the early defoliation of apple trees, which can be due to malnutrition of the tree, or defoliation caused by insect pests, such as the infestation of spider mites, golden-veined moths, or defoliation caused by spotted defoliation, anthracnose leaf blight, or brown spot disease.

What is the most effective medicine for apple trees to fall leaves in the early stage.

Hello, I am glad to answer for you that there are many reasons for the early defoliation of apple trees, which may be due to malnutrition of the tree, or defoliation caused by insect pests, such as the infestation of red spiders, golden-veined fine moths, or the spotted defoliation, anthrax leaf withering before the sale, or the defoliation caused by brown spot disease.

Brown spot is a green leaf with a little yellowing in the middle and a bulging symptom. It can be used with Wanxiu 2500 times + 1200 times Anshu Guoli + wind vane 8000 times + Amster 4000 times + Jinfu Niu 1000 times + Silk 6000 times for leaf preservation medicine. In addition, it is necessary to pay attention to prevention, before the fruit trees germinate, spray 3-5 Baumé stone sulfur mixture in the whole garden to completely eradicate the source of bacteria.

In addition, it can also be sprayed from late May to mid-August, spraying 4 to 5 times. For the first spraying, when the infected leaves reach 10%, the eggplant trace front should start spraying immediately. During the rapid growth period of new shoots, spray 1-2 times of systemic fungicide, after bagging with 1:

2 methods (200 240) Bordeaux liquid alternately, the control effect is better.

The symptoms of spotted defoliation disease are that after the onset of the leaves, there are brown round spots at first, and then gradually expand into laughing lesions, the lesions are brown, the edges are purple-brown, and there is often a dark dot in the center or concentric rings. The control method can be combined with the prevention and control of rot disease and ring pattern disease before budding, and spray 5 Baumé stone sulfur mixture on the whole tree to eradicate overwintering bacteria. Or use bacillus, manure impregnated with pampering liquid, etc. for early prevention.

The symptoms of apple rust are that the leaves are orange-yellow at first, and small dots are shiny, and then they expand to make small black spots appear next to the file, and then the spores turn black, and the back of the leaf grows yellow-brown from the hairs, containing a large amount of brown powder to accompany the end of the day. The control can completely remove the coniferous juniper within 5 kilometers from the orchard to cut off the infection cycle. Spray 1-2 times from budding to young fruit stage.

In addition, methyl tobuzin and carbendazim are conventional systemic fungicides, which can prevent and control apple ring disease, brown spot disease, anthracnose, mildew heart disease, etc., but not spot defoliation. Therefore, in orchards with severe spotted defoliation, the application of methyl tobuzin and polyredient should be cautious.

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Summary. Dear, I'm honored to have your question The information that the teacher found for you here is: what medicine is used for apple tree leaf litter, alachlor for apple tree leaf litter, kung fu, pyrethroid and other pesticides are the best.

Fruit setting period or early fruit stage of leaf fall, the main reason is the flowering period of insufficient fertilization caused, it is recommended: spray phosphate fertilizer and potassium fertilizer-based fertilizer, of course, you can also fertilize the roots, but the root fertilization effect is slow, if the fertility is insufficient, it is easy to cause fruit drop and so on. Therefore, it is still recommended to use foliar fertilizer, which is directly absorbed by the leaves of the plant and has obvious results and good results.

Fertilizer is recommended. 2% potassium dihydrogen phosphate is sprayed 2 times, usually once every 5-7 days. It is also good to add urea appropriately during the spraying process.

In the future, be sure to fertilize during the flowering period, especially phosphate and potassium fertilizers.

Dear, I'm honored to ask you Fenghong's first question The information that the teacher found for you here is: What medicine is good for apple tree deciduous leaves to use for apple tree deciduous leaves, kung fu, pyrethroids and other pesticides are the best. Defoliation at the fruit-setting stage or at the early fruiting stage, mainly caused by insufficient fertilization during the flowering period, it is recommended that:

Spraying fertilizers based on phosphate and potassium fertilizers, of course, can also fertilize the roots, but the root fertilization effect is slow, and if the fertility is insufficient, it is easy to cause fruit drop and so on. Therefore, it is still recommended to use foliar fertilizer, which is directly absorbed by the leaves of the plant and has obvious results and good results. Fertilizer is recommended.

2% potassium dihydrogen phosphate is sprayed 2 times, usually once every 5-7 days. It is also good to add urea appropriately during the spraying process. In the future, be sure to fertilize during the flowering period, especially phosphate and potassium fertilizers.

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1.Apples are susceptible to pests and diseases 7-10 days after flowering, so be sure to spray pests and diseases in time.

2.It can be sprayed with 1000 times of 70% methyl tobuzine wettable powder to prevent and control rotten fruit disease and mildew disease, and 50% promethine 1500 times liquid can be sprayed to prevent and control spotted defoliation.

3.Spray 5 Nisolan milk with 2000 times of oil content to control leaf mites.

4.Spray 525 Nongdile emulsifiable concentrate 2000 times to control aphids.

5.In addition, it is also necessary to pay attention to the method of spraying to prepare Zheng.