If a fruit tree in an orchard is sick, how can I tell if other fruit trees are sick?

There are wild vegetables, weeds and insects in the open space of the orchard, so stocking chickens in the orchard can not only replace manual weeding, but also replace artificial fertilization. Allowing chickens to eat a large amount of natural feed can not only improve the quality of chickens, but also reduce the cost of feeding, and the chicken manure in the orchard can also save orchard fertilizer. Orchard chickens can be free-range and captive breeding, stocking density to 200 300 per mu of orchard is appropriate.

Free-range farming method is to put the chickens into the orchard every morning when the sun comes out, let the chickens eat wild grasses, wild vegetables and insects freely, drink water regularly, and rush into the chicken coop to feed when the sun sets in the evening, and train into regular conditioning habits. Captive method, according to the orchard area is divided into several areas, the chickens are enclosed into an activity area with a net or plastic film, restricting the chickens from moving and feeding in the area, and moving to the second area after 1 or 2 weeks, and eating the orchard grass in turn to form an ecological food chain mobile feeding area. Specific requirements for raising chickens in the orchard:

Feed fertilization The feeding during the stocking period should follow the principle of "early should be less, late appropriate", and at the same time consider the poor foraging ability of young chicks. At night, you need to supplement concentrate, you can prepare powder, you can also use granules, each chicken more than 1 kg, should be supplemented with about 30 grams per day, play a role in fertilizing. Drinking water cleaning Place fixed drinking fountains in different areas of the orchard to prevent chickens from finding their own water sources and drinking potions and groundwater by mistake.

Especially during the orchard spraying period, attention should be paid to replenishing water to prevent chickens from spraying the remaining potions from fruit trees. Prevention of Infectious Diseases Infectious diseases in chickens are mainly Newcastle disease in chickens, bursa bursa in chickens, chicken pox and E. coli. Immunization is given after 2 months of age, so that the chickens have higher antibodies and resist the invasion of pathogens.

Don't neglect epidemic prevention because the orchard is far away from other farms. Prevention of coccidial harm Summer is the coccidia breeding season, and there is soil and manure in the orchard, so the chickens should be fed with anti-coccidial drugs regularly, such as Dikeweili, green bulb enemy, etc., once found to be sick, penicillin should be used in time**. Pay attention to the observation of chickens when stocking to strengthen patrols and observations, found that the action is outdated, alone, listless, sick and weak chickens should be isolated in time for observation, ** or elimination.

Prevention of pesticide residue poisoning Fruit trees should choose low-residue pesticides when using medicines, and arrange the parking time and withdrawal period. Especially in the area where the spray has just been sprayed, the chickens cannot be stocked for 3 to 5 days. Choose orchards with high tree age According to surveys, orchards with trees more than 5 years old are conducive to chicken feeding and lighting.

Orchard disinfection If the chickens need to be stocked in batches, they should carry out an orchard ploughing after the last batch of the garden, turn the chicken manure into the soil below 20 cm, and then splash the disinfection with quicklime or lime emulsion for the next batch of stocking.

For the prevention of physiological diseases and pathological diseases, it is necessary to choose seedlings with good quality and good disease resistance to prevent them, so as to facilitate planting and care in the future.

Rot disease, anthracnose, brown spot, gray spot, round spot, corner spot, scab, rust, powdery mildew, leaf shrinkage, bacterial perforation, gray mold, jujube madness, blight, canker, branch blight, various nutrient deficiency diseases.

At present, 282 viruses have been identified as harmful to fruit trees, and 21 have been identified in China (Fu Runmin, 1997). The occurrence and epidemic of these viral diseases have caused huge losses to production and even brought a devastating blow. The strawberry virus has severely reduced strawberry production in Japan, almost destroying strawberry production.

Citrus recession has devastated most of Brazil's citrus groves, and 80% of sweet oranges in São Paulo state have died due to viral diseases, which still threaten the world's citrus industry. In China, citrus huanglongbing disease still seriously affects the development of the citrus industry.

The damage of the virus to fruit trees can be summarized as follows: seed germination rate decreases, the number of ramets at seedling stage decreases, grafting incompatibility, germination rate decreases, growth decreases, yield decreases, fruit quality decreases, causes tree decline and finally tree death.

Fruit tree virus diseases have the following pathogenic characteristics: Fruit trees are perennial plants, and once infected by viruses, the tree will be poisonous for life; Virus infection causes the whole body of fruit trees to be poisonous, and in the process of asexual reproduction of fruit trees, it is transmitted to offspring through scion, cuttings and seedlings, causing lasting damage. Fruit tree viruses are mainly transmitted through grafting, mechanical injury contact, and insects. Fruit tree viruses are divided into non-latent viruses and latent viruses, the former mostly presents typical symptoms and is easy to identify in appearance, while the latter often does not show symptoms and is not easy to be detected, and is often infected by several viruses, which is particularly serious. So far, there is no effective method of drug control.

Teacher Jing, good morning.

This is a cotton aphid.

1. Strengthen plant quarantine: It is strictly forbidden to transfer seedlings and scion from the area where apple cotton aphid disease occurs, strengthen the quarantine supervision of the fruit market, and strictly control the quarantine and transportation quarantine of the place of origin. Pictured is an apple tree suffering from the apple cotton aphid.

2. Reasonable pruning: cut off diseased and insect branches, scrape insect scars and concentrate on treatment to reduce insect sources; Increase the application of organic fertilizer to strengthen the tree and enhance its resistance to diseases and insects.

3. Artificial control: Scrape with a knife or brush in winter and early spring during the dormant period to eliminate the overwintering 1st and 2nd instar nymphs.

4. Root application: irrigate the roots with 1000 times of 40% oxidized dimethoate emulsifiable concentrate or 3000 times of 50% anti-aphid wettable powder, the amount of root irrigation depends on the size of the fruit tree, generally water penetrates into the root system is better, and 10% imidacloprid wettable powder 2000 times can be applied to the root during the peak period of cotton aphid occurrence in May, June and September and October, or 5% aldicarb granules 200g strains and 250g plants can be applied to the roots in mid-April or early October, which can effectively kill the cotton aphids parasitic in the roots. The soil around the roots is cut out before application, and the soil is covered after application.

5. Branch coating: scrape the 6cm wide skin ring with a knife on the main trunk or main branch, apply 30 times and 50 times the liquid of 10% imidacloprid wettable powder to the skin ring with a brush, apply 5ml of liquid solution to each tree, and wrap it with plastic cloth after application. Or use absorbent cotton wool dipped in 60ml of liquid medicine evenly spread on the scraping part, and then wrap the plastic cloth around the cotton wool.

In mid-April, the trunk was annually coated with 10% imidacloprid wettable powder 50 times 100 times liquid or 40% aphid multi-emulsifiable concentrate 5 times liquid.

6. Spraying on the tree: spraying the tree in time during the occurrence season of apple cotton aphid, the commonly used pesticides are 10% imidacloprid wettable powder 2000 times, 48% lesben emulsifiable concentrate 1500 times, aceloids aphid wettable powder 1000 times, 5% acetamiprid wettable powder 2000 times, 22% pyridoxine emulsifiable concentrate 2000 times. The spraying period should be sprayed twice before the peak of the occurrence of apple cotton aphid, that is, in early to mid-June and early to mid-October.

Special attention should be paid to the quality of spraying, and the spraying should be thoughtful and meticulous; The spray pressure should be larger, and the nozzle should be directly aimed at the insect body, and the white waxy hair on the body should be washed off, so that the liquid medicine can touch the insect body, so as to improve the control effect. It is best to spray contiguous orchards at the same time to prevent the spread of cotton aphids. When spraying fruit trees, attention should be paid to the safe interval of apple picking, so as to ensure that the quality of fruits is safe and the prevention and control of aphids.

7. Use of natural enemies: The natural enemies of apple cotton aphid include aphid wasps, seven-star ladybugs, turtle ladybugs, heterochromatic ladybugs, various lacewings and aphid-eating flies, among which aphid wasps have a long occurrence period, fast reproduction and strong control ability, and their highest parasitic rate in mid-September is 65%.

No, you see there is white plastic on the branches, which is harmed by cotton aphids.

You search for apple aphids, and the symptoms are exactly the same.

You are welcome.