Why are my citrus leaves yellow (winter)?

Why are my citrus leaves yellow (winter)?

Yellow citrus leaves are fairly common in late winter, often after winter fruit production and before spring new growth. You will want to apply fertilizer before the tree begins to bloom again. The UC Integrated Pest Management website has cultural recommendations for citrus. Look especially at the fertilizing recommendations.

The Alameda Master Gardeners have addressed the general topic of yellowing leaves on citrus trees in their Answers to Common Citrus Questions. 

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