Citrus Trees | UC Agriculture and Natural Resources

Information about growing citrus trees in Alameda County. Learn what to do with yellowing leaves in citrus in different seasons, and stopping spread of citrus disease.

Citrus tree showing thinning canopy and fruits that fall easily, symptoms of HLB disease

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Invasive Pests and Plants - the Asian Citrus Psyllid and HLB Threaten to Devastate Our Citrus

December 3, 2024

By Judy Quan

Protect citrus trees from the invasive Asian Citrus Psyllid. Learn how you can help prevent the spread of this harmful pest.

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Lemon tree with yellow leaves in suburban yard

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Yellowing Leaves and Leaf Drop in Citrus in Winter – A Common Problem

March 18, 2024

By Judy Quan

Yellowing citrus leaves in winter? Learn why it's common and how Alameda County Master Gardeners suggest caring for your citrus trees in colder months.

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Abnormally dark green grapefruit foliage from excess nitrogen (left), compared, with uniformly pale citrus leaves due to nitrogen deficiency

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Yellowing Citrus Leaves in Spring, Summer and Fall. What to Do?

April 14, 2024

By Judy Quan

Diagnose yellowing citrus leaves during spring, summer, and fall. Learn iron & nitrogen deficiency symptoms, causes, and effective treatment solutions.

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Citrus Leafminer

Understanding citrus leafminer: Learn why this common pest causes cosmetic damage but doesn't harm your citrus trees.

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