Apple lacks yellow leaves
symptom??
Apple yellow leaf disease mainly manifests on the young leaves of new shoots. The beginning of leaf yellowing first, while the veins remain green on both sides, resulting in leaf green reticular chlorosis. With the development of the disease, the degree of chlorosis of the leaves increased, and the entire leaf turned white, leaving the leaf margins charred and causing fallen leaves. When the iron deficiency is severe, the tip of the shoot will die. The fruit of the diseased tree is still green.
Cause: Apple yellow leaf disease caused by iron deficiency, iron deficiency symptoms from the young tip of the new shoot began to show performance.
Incidence conditions:
1. Degree of soil salinization: In the saline-alkali soil, fruit trees show iron deficiency. For example, when groundwater evaporates, salt is concentrated in the surface layer of the soil. In the depression where the groundwater level is high, salt content accumulates at the surface with the groundwater. The soil is heavy and the yellow leaf disease is prone to occur when the drainage is poor.
2. Rootstocks: Apple trees with mountain stators as rootstocks are prone to yellow leaf disease, and jellyfish are used as rootstocks. Yellow leaf disease is generally lighter.
Control methods:
1. Improve soil alkali: increase organic fertilizer and grow green manure. Dig ditch drainage to reduce the groundwater level; seepage sand and viscosity, increase soil permeability.
2. Properly supplement ferritin:
Before germination, the branches were sprayed with 0.3% to 0.5% of ferrous sulfate solution, or ferrous sulfate: copper sulfate: quicklime: water = 1:1:2.5:360, which had the effect of controlling the disease, but it could not last long.
The ferrous sulfate and organic fertilizer are mixed in a ratio of 1:5. Each application of 2.5 to 5 kg can have an effect of more than two years. The application of chelated iron (ethylenediaminetetraacetic acid iron) in soil is effective for the treatment of yellow leaf disease.
Before the budding of the fruit trees, the lateral roots were immersed in 33 to 50 times of ferrous sulfate, and 100 kg of liquid was applied to each of the plants. Alternatively, 250 tons of ferrous sulfate and 0.5 kg of ferrous sulfate could be used in a can bottle to find 0.5 cm in each direction. Long root inserted into the bottle. Use 6 bottles per tree. The bottle was placed in the ground and buried in soil. After the roots were absorbed for 24 hours, the bottle was taken out. This method saves medicine and has quick effect.
Before germination, the trunk was injected with ferrous sulfate or ferric citrate for 1000-2000 times. Some injections of ferrous sulfate 200 times plus zinc sulfate 200 times. When the injection method is used improperly, it is prone to phytotoxicity and should be tried carefully.
3. Improved soils: For orchards with poor soil conditions such as saline and alkaline lands, clay lands, and sandy soils, biological measures or engineering measures should be used to improve the soil.
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