How to treat citrus canker and what medicine is good for citrus canker

1) Strict implementation of quarantine. The transportation of citrus seedlings, scion, rootstocks, seeds and fruits should be strictly quarantined in accordance with regulations to prevent the spread of canker. Diseased trees and seedlings were found in the reserve and immediately burned.

2) Cultivate disease-free seedlings. The nursery should be established in a disease-free area with no citrus plants above 1 000 meters around, and establish a disease-free high-quality mother garden, and in situ ** disease-free scion.

3) Reduce fruit and leaf damage. Windbreaks can be created to reduce wind speed in orchards (especially in areas with typhoons, which can significantly reduce the occurrence of diseases); Timely control of leaf miner moth and other pests to reduce insect damage.

4) Prevention and control of green pollution-free traditional Chinese medicine preparations: focusing on the summer and autumn shoot extraction stage and young fruit stage, dilute "Liangguo'an" by 300 times of the solution, and spray the whole plant evenly, which can effectively prevent canker, resin disease, anthracnose, scab and other diseases, and at the same time enhance plant immunity and improve the disease resistance of the plant.

5) Chemical drug prevention and control: Bordeaux liquid copper sulfate 0 5 0 8 kg, lime 1 1 6 kg, water 100 kg, copper soap liquid copper sulfate 0 25 kg, pine resin mixture 1 kg, water 100 kg, Baumé stone sulfur mixture, 72% agricultural streptomycin wettable powder 2500 times, 3% chrynucleomycin water 300 times, 77% can kill 2000 type 800 times liquid, 80% essential wettable powder 400 600 times, 20% Runkella sterilization copper suspension 500 times, 12% chlorphurin emulsifiable concentrate 500 times.

6) Clearing the garden in winter. Diseased branches, leaves, and fruits are pruned and burned intensively.

Citrus canker disease is a major stubborn disease affecting the development of the global citrus industry. Citrus canker probably originated in India or Java, and was first developed in China in 1919 on sweet oranges, pomelos and mandarins in southern China. The disease occurs from early April to late November every year.

Prevention and control methods. 1) Physical control seed disinfection: first pre-soak with 50 52 hot water for 5 minutes, then soak in 55 58 warm water for 50 minutes, take it out and put it into room temperature water to cool down, and the surface can be sown after being slightly dry.

Seedlings and scion disinfection: seedlings without budding and without soil, scion with mercury solution soaked for 3 minutes and then washed, seedlings with soil sprayed with Bordeaux liquid, and those that have been sprouted are soaked with 700 units of streptomycin per milliliter plus alcohol as an adjuvant for 30 60 minutes.

2) Chemical control of seedlings and young trees is mainly to protect shoots, 20 30 days after the germination of new shoots, the length of the shoots is cm, the leaves are just turned green when spraying once, and then every 10 15 days, spraying 3 4 times in a row, until the new leaves completely turn green; Adult trees are mainly preserved fruits, sprayed once the day after the flower, and should be sprayed in time after typhoons and storms. The optional agents are: 10% agricultural streptomycin sulfate (ulcer) 1000 times liquid, 64%.

3) Agricultural control Carry out timely prevention and control of leaf miners, butterflies, weevils, etc. Erase summer shoots and some early autumn shoots in time, and put them together at the end of July or August. If diseased leaves, branches and fruits are found, they should be cut off in time after the leaves are dewed and dried, and the diseased spots on the trunk should be scraped off; Plants with particularly serious susceptibility should be dug up as a whole and sealed with stone sulfur mixture.

Citrus canker this basically no specific medicine, if the age of the tree is short, it is recommended to cut it directly to change the species, must not buy seedlings in the citrus epidemic area, must show the "plant quarantine certificate" The epidemic area is not qualified to open this certificate, only in the root to eliminate the source of infection of seedlings, buy non-toxic seedlings to establish a closed orchard, regularly spray pesticides to prevent insect pests, can not let the tree wounds, 90% of the source of infection is from the wounds of the tree into the spread, in order to breed citrus seedlings for many years of experience All the places that are included in the epidemic area by the state have different degrees of ulcer diffusion area, huanglongbing is also the object of quarantine, large fruit flies, small fruit flies, root nematodes, etc. There is no drug**, so the Ministry of Agriculture does not let the seedlings in these places spread outward, in recent years, due to the lax supervision of relevant departments, coupled with the weak awareness of fruit farmers, greedy for cheapness and convenience, so the scope of the epidemic area in China has increased year by year, so this problem should attract everyone's attention.

Bacterial wilt is one of the important diseases of eggplant in southern China, which occurs every summer. Solana fruits are prone to diseases in heavy crops, acidic soils, clay soils, high groundwater levels, and poor drainage. Prevention and control methods.

Crop rotation with non-Solanaceae crops for 2 years. The best effect is between water and upland rotation. There are differences in disease resistance between varieties, and disease-resistant varieties are selected, or grafted are adopted.

Seeds are collected from disease-free fields and disease-free plants. 100 150 kg of nitrate lime was applied per mu in the severely affected land to adjust the soil pH to pH 8. Protected areas should be protected to increase ventilation and proper shading, and reduce soil temperature.

Cultivate the furrow in the open field, spread straw, wheat straw, etc., to prevent the ground temperature from rising. At the beginning of the disease, 4000 times of 72% agricultural streptomycin sulfate soluble powder, or 500 times of 50% copper succinate wettable powder, each plant was irrigated with liters, once every 10 days, a total of 3 4 times.

When all drugs fail there is only one specific drug alkali copper lime. It can be used for prevention and treatment once, and the results are immediate.

1. Canker disease is a bacterial disease. Transmission route and disease conditions: In the spring when the temperature and humidity are suitable, the pathogen can be transmitted through rain and insects, and after the invasion of the host's stomata, skin hole or wound, after about 3-10 days of incubation period, when the humidity and temperature are suitable, the disease begins to manifest.

Therefore, it is important to prevent ulcer disease as early as possible. For example, when the spring shoots have just been extracted or when the young fruits have just formed, before the stomata of the above-mentioned organs have not been formed and the bacteria are difficult to invade, that is, when the young shoots and leaves have not developed into large leaves after germination, or when the flowers begin in the later stage, or before the arrival of high temperature and humidity weather, or after the rainstorm or typhoon, the preventive effect can be obvious.

If the drug is used when the above-mentioned organs have more severe lesions**, it is difficult to restore the organs infected with the ulcer disease, even if the development of the disease can be suppressed. Suitable period of medication: when the new shoots are extracted from the large leaves and the flowers fall up to 2 3, that is, the young leaves and young fruits do not form stomata when the medication is started, and then the medication is re-applied every 15 days, and the drug is generally used 2-3 times.

The selected drugs can be 600 times of 20% thiococcin copper suspension, or 500 times of basic copper sulfate, or 500 times of 77% copper hydroxide, or 2500 times of 72% agricultural streptomycin wettable powder, or 2500 times of 72% agricultural streptomycin sulfate wettable powder.

2. The fungicide containing copper sulfate and calcium should be Bordeaux liquid. Bordeaux liquor is a mixture of copper sulfate and lime milk, but it is generally not called from the generic name of pesticides"Calcium copper sulfate", and specifically called"Bordeaux liquid"。Because Bordeaux liquid is alkaline, while potassium dihydrogen phosphate water-soluble liquid is acidic, the two should generally not be mixed.

In addition, when using Bordeaux liquid, it should be noted that it should not be used in the case of high humidity or when the leaves of the plant are foggy and dry, so as to avoid excessive precipitation of copper ions in the Bordeaux solution due to high humidity, which will cause pesticide damage to the delicate tissues of the plant.

There are mainly Chunlei King copper, copper hydroxide, quinoline copper, copper pineinate, etc., which can be sprayed and used using 750 times of quinoline copper, 750 times of quinoline copper + 3000 times of organic silicon, 500 times of copper hydroxide, 500 times of copper hydroxide + 3000 times of organic silicon, 500 times of spring thunder king copper, 500 times of spring thunder king copper + 3000 times of organic silicon, 500 times of copper pineinate, 500 times of copper pinein acid + 3000 times of organic silicon, etc.

Citrus canker disease is severe, and it can be irrigated with 150-300 times of R. solanacearum + 300-500 times of Diliwang + 600 times of Wofengsu 1 time, and irrigated in the capillary root area, subject to irrigation.

Citrus canker and insect pests occur together, and there are skills in choosing pesticides for prevention and control, and fruit farmers must see the technical plan!

Citrus canker disease is "pervasive" How to use medicine scientifically?

How can citrus "canker" be effectively prevented? Stick to this method, and the effect is significant.

It is a disease infected by bacteria, and spring thunder is used for prevention. King copper, thioxene copper, thioxen copper, quinoline copper, copper hydroxide, etc., when the disease is serious, it can be compounded with allicin ten silicone, the prevention and control effect is very good, after the onset of the disease, foliar spraying every 7 10 days, spraying 2 3 times in a row, and spraying rhizomes can control the disease, need to buy pesticides and more planting knowledge on the harvest is the best, there are many brands, do not worry about buying inferior products, and can also consult on planting problems.

According to the experience of Guangxi and Fujian, spraying the old high-fat film emulsion twice in spring, summer and autumn can effectively prevent citrus canker disease. This is the experience of Jiangle County Economic Station and Jiangle County Plant Protection Station in 1988.

Citrus canker disease is a critical period for prevention at the young fruit stage and when the buds are 1 cm long: it is recommended to use the safe agent thiazillium copper 1000 times and thiazole zinc 800-1000 times spraying. At other times, copper hydroxide 800 times, calcium copper sulfate 800-1000 times, and luomine 500 times spray are used in rotation.

Once every 7-10 days!

Citrus canker disease, master the time and method of prevention and control, save money and increase efficiency!

You can use 12% copper pinein acid page spraying, with 2000 pounds of water, more suggestions can go to the harvest of agricultural materials to find expert consultation, pesticide procurement is also assured, are direct sales from manufacturers, ** is also very suitable.

If it doesn't rain, you can put an ulcer on it and wear it quickly.

3.In orchards where canker disease is common, before and after typhoons or storms: diluted with 800 kg of water and sprayed on the whole tree.

4.Pharmaceutical prevention and control. The focus of pesticide control is in the autumn stage and the young fruit stage, and the whole tree is sprayed after diluting the golden hundred grams according to 500 times of the solution;

Note: When ulcer disease occurs, spray in time for prevention and control, spray evenly and spray 2-3 times in a row, spray once every 7-10 days, and spray regularly for prevention and control in the future.

5.The garden is cleared in winter. Diseased branches, leaves, and fruits are pruned and burned intensively.

Our fruit farmers have used copper preparations and agricultural streptomycin, the effect is not very good, and later after the introduction of Demer's ulcer speed wear, the effect can be said to be very fast, and there is no ** situation until now.

Strict quarantine is in place. It is forbidden to import citrus seedlings, scion, rootstocks, seeds, fruits, etc. from the sick area. If citrus propagation material must be introduced from the diseased area, it should be planted on a trial basis in the isolation area, and after 1 or 2 years, it can be planted in the disease-free area after it is confirmed that there is no canker disease.

Apply disease-free seedlings. The nursery should be located in a disease-free area, with no citrus plants at least 1 km around. Rootstock seeds should be harvested from disease-free fruits, and harvested from disease-free areas or disease-free orchards.

Both rootstocks and grafts must be sterilized before they can enter disease-free nurseries. During the seedling period, the diseased plants should be burned in time, and sprayed to protect the nearby healthy seedlings, and the seedlings out of the nursery should be strictly quarantined to confirm that there is no disease, and then they are allowed to go out of the nursery. Strengthen fertilizer and water management to make its tips uniform and neat.

In the shoot stage, especially in the autumn shoot stage, the prevention and control of leaf miner moth should be done in time. If diseased plants are found, they should be dug up and burned in time, and sprayed to protect the surrounding healthy seedlings, and then replanted with disease-free seedlings.

How can citrus "canker" be effectively prevented? Stick to this method, and the effect is significant.