What to Do About Citrus Yellowing? Cause Analysis and Solutions
Yellowing is now a common problem in citrus cultivation, and it gives many fruit growers a serious headache. It mainly shows as leaves turning yellow and dropping, poor disease resistance and susceptibility to disease in the plant, and low fruit yield and quality, seriously affecting the grower's income. So what causes yellowing? How should it be solved? Come to Qinnong Web to see the detailed introduction.
1. Lack of elements
Citrus trees need many trace elements during growth. Once a certain element is lacking, yellowing appears. For example, when nitrogen is lacking, the plant's leaves begin to turn yellow and become thinner; when phosphorus is lacking, new leaves grow densely and old leaves turn bronze-colored; when magnesium is lacking, old leaves begin to turn yellow and show triangular yellow patches; when iron is lacking, new leaves begin to turn yellow; when calcium is lacking, the leaf veins begin to turn yellow, and so on. A lack of any element in the plant can cause yellowing.
Solution: Fertilize frequently to ensure the nutrients needed for plant growth. When fertilizing, pay attention to balanced combinations and the supply of various elements. Never apply a single fertilizer. It is recommended to apply organic fertilizer or multi-element compound fertilizer.
2. Soil and root causes
Problems with the soil and root system can also cause yellowing in citrus. When soil fertility is poor or the soil is compacted, the roots cannot grow normally or are damaged and cannot absorb nutrients and water, causing leaves to appear half green and half yellow, and in severe cases causing leaf drop. In addition, root-knot nematodes can also cause root nodules, preventing normal growth and absorption, and this condition can also appear.
Control method: Choose a plot with fertile, loose soil for planting. Strengthen management during planting, fertilize regularly, maintain soil fertility, loosen the soil and weed on a regular schedule, and increase soil permeability. Use root-knot nematode control agents as a root drench to eliminate the disease.
3. Pests and diseases
Citrus has a great many pests and diseases, with more than four hundred recorded. Some pests and diseases can also cause citrus leaves to yellow. For example, among diseases there is huanglongbing, and among pests there are mites, aphids, longhorn beetles and psyllids. All of them can cause yellowing.
Control method: These pests and diseases cannot be treated as all the same; specific methods require specific analysis. Different pests and diseases have different methods, so you must understand their damage characteristics in order to prescribe the right remedy.
The above is the cause and solution of citrus yellowing brought to you by Qinnong Web. The issue of citrus yellowing is introduced here. The editor has also brought solutions for various causes, hoping to help you. For more agricultural knowledge, please keep following Qinnong Web.