How to control apple rust? Apple rust is also known as brown spot disease, apple rust, sheep beard, apple rust will cause the diseased leaves to turn yellow, cluster hair, fruit deformity and early fall, the disease is mainly harmful to the leaves, can also damage the shoots , young fruit and fruit handle. This year, apple rust in Chengcheng County occurred in a large area, and the reasons are mainly as follows.
- The understanding is not in place: rust is in the production of apples, and fruit farmers lack their awareness and prevention. In recent years, a large number of cypresses have been planted around the base and on the roadside, providing a place for the bacteria to overwinter, and once the climate is adapted, it will become a pandemic and cause harm. When the apple is germinated to the size of the young fruit thumb, a 1-2 degree stone sulphur mixture is sprayed on the cypress, and the whole tree is sprayed 1-2 times.
- The disease law is not mastered. The rust of apple trees begins to occur in the germination stage to the young fruit stage of the fruit tree every year. The occurrence of the disease is closely related to the environment. During this period, if there is rainfall of 10mm-20mm, the temperature is above 6°C. It can be ill, and the safe transmission route is mainly spread by the wind and rain within 1.5-5 km.
- The medication is unreasonable, and the rust medication is mainly based on triazole fungicides. Fruit farmers generally use a drug such as atropine, carbendazim, manganese, etc., which can not achieve the control effect. It should be used for the first time when the leaves are green and red, and spray 15% triazolone 1500 times or 43% tebuconazole. 4000 times, this can prevent rust and prevent and control the occurrence of powdery mildew.
After flowering, it should be 800 times of 80% mancozeb. In the later stage of prevention and control, if it is rainy or red spot with the tip of the blade is found, it should be sprayed with 43·teoxadol 2000 times to prevent the occurrence of rust.
Spraying the systemic bactericides within 5 days after spraying the rust bacteria into the apple leaves can effectively control the expansion and disease of the invading bacteria. The later the spraying period, the worse the control effect. Spray treatment should strictly control the time of medication, and the medication time can be determined according to the following methods:
- In April-May, if there is rainfall exceeding 5mm and the rainfall lasts longer than 12 hours, spray the systemic fungicide within 5 days after the rain;
- Or a large amount of germination in the teliospora angle, that is, after the "cypress tree flowering", and the "cypress tree flowering" at the same time lasting more than 12 hours of rainfall, spraying the systemic fungicide within 5 days after the "cypress tree flowering";
- Or when the apple and pear leaves are just beginning to appear, that is, when the red dot of the needle tip size appears, the systemic fungicide is sprayed immediately.
- Commonly used systemic fungicides are flusilazole, difenoconazole, and triazolone; commonly used protective agents are mainly made of mancozeb as an active ingredient.
This article URL: How to prevent apple rust
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