Why does your Citrus reticulata have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Nitrogen is a mobile nutrient; when lacking, the plant moves it from older leaves to new growth, causing uniform yellowing (chlorosis) of older foliage first. This is common in Mandarin oranges due to their heavy nutrient demands during fruit production.
Mandarin trees are highly sensitive to waterlogged soil which suffocates roots and prevents oxygen uptake. This leads to chlorosis and can eventually progress to leaf drop or root rot.
If the soil pH is too high (alkaline), iron becomes chemically locked in the soil and unavailable to the Citrus reticulata. This results in interveinal chlorosis, where veins remain green but the leaf tissue turns bright yellow.
While primarily known for silvery trails, heavy infestations of Citrus leafminer larvae can cause physiological stress and leaf discoloration. This disrupts the photosynthetic capacity of the Mandarin leaves.
Your plant might also be experiencing one of these issues:
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