1.If the leaves are yellowing rapidly in the whole garden, it is likely to be a phytotoxicity; (because of lack of nutrients or disease, it is unlikely that the whole garden will break out soon).

2. If it is sporadic, part of the plant leaves yellowing and there is a process, it may be lack of nutrients, root diseases or leaf diseases.

3. If the leaf veins are green, but the veins are yellow, it may be iron or magnesium deficiency. We can continue to subdivide. If the old leaves are yellow and the new leaves are not yellow, it can be identified as magnesium deficiency; if the old leaves are not yellow and the new leaves are yellow, it can be identified as iron deficiency.

4. If the veins of the yellow leaves are yellow and the veins are green, it can be identified as a virus disease.

5. If there are yellow spots on the yellow leaves, and the macula is slowly necrosis, it can be identified as a fungal disease on the leaves.

6. If the yellow leaves wither from the edge of the leaf first, but the veins and the veins are still normal, it can be identified as root damage or fertilizer damage.

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