It is unfortunate to tell everyone, yes, the citrus canker disease will be endless, relying on the existing means can not eradicate the pathogenic bacteria of the ulcer disease - M. huangji. Therefore, infected trees will carry pathogenic bacteria for life, and once the conditions are appropriate, the disease will break out, and the heavier the disease, the more difficult it is to control. However, as long as the management pays attention to it, early prevention work, timely control of mild illness, citrus canker disease is not so terrible.
1. The selection of the seedlings is not serious, the ulcers are destroyed for life.
It has been said that the citrus canker can not be eradicated, and the disease in the seedling stage is the disease for the rest of the life. Only the non-stop drug prevention, so do not plant diseased seedlings and grafted diseased branches.
2. Management is not good, causing infection, simply regret the bowel
The first diseased area should be isolated from the unaffected area, and the soil and agricultural tools should be disinfected to reduce the frequent ingress and egress of people and artificially infect healthy orange trees.
If you find a mild ulcer disease symptoms, you can not take it lightly, you must quickly control the drug, and then cut off the diseased leaves to bring out the orchard to burn, pay attention to cut off the diseased branches and leaves to disinfect the scissors, try not to damage other branches and leaves, to avoid infection. After cutting off the leaves, take another drug control and review it every 7 days.
After the stormy weather, the bacteria easily infect the leaves through the wound, and the high-humidity environment is very easy to develop. Therefore, in case of heavy rain, it is necessary to use a medicine with good therapeutic effect before the rain, and then use the drug with strong systemicity after the rain.
Young tissues are prone to illness and prevent them in advance. When the new shoots are taken one or two centimeters ago, the medicine is started on the tenth day after the young fruit falls.
3. The pests are not cured, and the outbreak is more serious.
The citrus mites, leaf miner and other pests feed on the leaves to form a wound that provides a "safe passage" for the invasion of ulcer bacteria, making the disease outbreak faster and more serious, so we must control the number of insects and minimize the damage to the leaves. .
What medicine to use?
I. Pharmacy evaluation
1. Inorganic copper chemicals (such as copper hydroxide, spring thunder copper, cuprous oxide, etc.) have the best control effect, but high temperature, compounding is prone to phytotoxicity, and will kill natural enemies of rust tick and red spider, stimulate Spawning, induced outbreaks. Use with caution.
2. Organic copper (such as thiabium copper, quinoline copper, etc.) and antibiotics (such as chunleimycin, allicin, etc. In addition, agricultural streptomycin sulfate is banned because it is harmful to humans), it has systemicity. However, the effect of single use is not very good, suitable for compound use.
3. Fungal agents (such as zinc, thiazolone, bromide, etc.) have a poor effect, but the synergistic effect of the systemic ulcer disease is not easy to resist.
4. Disinfectants (such as sputum, stone sulphur, etc.) have a certain effect, but the duration of the effect is short, it is not good to compound.
5. Other agents such as Bacillus subtilis, leaf azole, zinc thiazole, etc., systemic, safe, and complex, but the effect is not satisfactory when the disease is serious.
Second, the use of guide
"Three cans" & "three can't"
Systemic drug + inorganic copper - synergy
Systemic Agent + Protective Fungal Agent - Synergism
Systemic Drugs + Systemic Drugs - Synergism
Copper preparation + copper preparation - phytotoxicity
Inorganic copper + other metal ion agents - phytotoxicity
Long-term monotonous use of inorganic copper - phytotoxicity
The medicinal agent should be sprayed everywhere, especially to ensure the amount of the back of the leaf.
Multiple drugs are used in rotation to avoid drug resistance.
Do not spray on rainy days, foggy days, or when the dew is not dry, to avoid the release of copper ions to accelerate the phytotoxicity.
Unused medicinal agents, first try to spray two or three trees and then determine that there is no phytotoxicity to use.
Purchase pharmaceuticals with traceable electronic codes produced by regular manufacturers to avoid phytotoxicity caused by inferior chemicals.
Organic control method
Microbial control: Microorganisms such as actinomycetes and antagonistic bacteria in the soil have a good inhibitory effect on ulcerative pathogens. Try to protect the soil microbes or introduce some beneficial microbes.
Plant Sterilization: Guangdong snake grape, monkey earrings, Feng Yang, Hook Kiss, Geng Gui Qian Jin Teng, Guangxi Di Rong, Amaranth and other more than ten plants have a good inhibitory effect on ulcer disease.
This article URL: Citrus ulcer disease prevention and control methods! How to effectively solve citrus canker disease
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