Why does your Citrus sinensis have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Nitrogen is a mobile nutrient in citrus; when lacking, the tree moves it from older leaves to new growth, causing uniform yellowing (chlorosis) of older foliage first.
Common in citrus trees planted in high-pH (alkaline) soils, iron becomes chemically unavailable to the roots, leading to yellow leaves with distinct dark green veins.
Excessive soil moisture displaces oxygen in the root zone, leading to root decay which impairs the tree's ability to transport nutrients and water.
Larvae tunneling through leaf tissue disrupt photosynthesis and can cause leaves to curl and turn yellowish or bronze as they deform.
A lack of magnesium often presents as yellowing on the margins of older leaves, sometimes progressing to necrotic spots.
Your plant might also be experiencing one of these issues:
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