How to prevent and cure delicious citrus peeling disease and root rot disease?

China is one of the important places of origin of citrus. Citrus resources are rich, and there are many excellent varieties. It is also a precious fruit for human beings. Many areas are cultivated as economic fruit trees. How to prevent citrus split skin disease and root rot?

I. How to prevent citrus split skin disease and root rot?

1. Citrus peel crack is one of the most important citrus diseases caused by citrus peel crack virions. The disease can infect many species and varieties of citrus plants, and the response varies greatly. Most rootstock varieties, such as sour orange, red orange, sweet orange, sour orange and rough lemon, had no visible symptoms. Citrus plants rooted on trifoliate orange, orange orange and lemon showed obvious symptoms and suffered serious damage. The diseased seedlings showed no symptoms at seedling stage, and the time required for bark dehiscence of field plants was generally 4~8 years after planting.

2. Control methods:

(1) Nurturing disease-free seedlings. The parent trees were identified by using Citrus arizona 86l strain as indicator plant. It was proved that the non-diseased plants could be picked for propagation, and the virus-free plants could be cultivated by shoot tip grafting.

(2) Grafting knife or pruning shears and other tools can be disinfected with 1% sodium hypochlorite solution or 10% bleaching powder aqueous solution 10 times. Immerse the tool in disinfectant or wipe the blade with cloth for 1~2 seconds, and then rinse and dry it with clean water.

(3) Implement plant quarantine to prevent proliferation.

II. How to prevent citrus root rot?

1. Citrus root rot is correctly called foot rot disease, caused by a variety of fungi, growth temperature 10-35 degrees, easy to break out in 25-28 degrees, this disease should be congenital prevention, and select trees to use bitter orange, orange based, sour orange (tangerine) lime resistance to this disease is weak, in grafting to try to improve the interface, planting can not be too deep, should be based on the original mud print of seedlings, these two methods can greatly reduce the occurrence of this disease.

2. Comprehensive control measures should be taken to strengthen fertilizer and water management, promote root growth and improve root vitality. Specifically, the following links should be grasped:

(1) Regulate the irrigation and drainage system of the garden to eliminate the threat of drought and flood, which is conducive to root growth.

(2) Apply fully decomposed organic fertilizer, increase phosphorus and potassium, improve plant root vitality, promote plant growth, tree vigor.

(3) Minimize root damage when cultivating soil.

(4) For the newly infected plants, the diseased roots can be moderately cut off (carefully collected and burned) and the Trichoderma harzianum biological preparation (used according to the instructions) or the tricyclazole well suspension agent 500 times (point irrigation at a certain distance within the tree crown, irrigation 2~3 times, once every 15~20 days). (5)Spraying foliar nutrients outside roots to promote plant growth, irrigating 600~1000 times potassium permanganate solution on ground to promote root growth, this work should be carried out at least once or twice a quarter, and can be combined with other fertilizer management.

During the growth and development of citrus, due to the influence of harmful organisms or adverse environmental conditions exceeding its adaptive capacity, its normal growth and development are inhibited, metabolism changes, resulting in reduced yield, quality deterioration, and even death, which brings great losses to the economic value of citrus and seriously affects the economic income of growers. Therefore, A clear understanding of the main citrus diseases and pests and effective measures to control them are the biggest gains for growers.