Mandarin Trees

Mandarin Tree Needs Help

enem added on December 18, 2016 | Answered

I need help with my mandarin tree. I have attached pictures of the different problems I'm seeing and would appreciate if someone could help me and tell me what I need to do to take care of it. It's showing dry/dead branches and sooty deposits on leaves and fruit, and the leaves don't seem to be vibrant. I fertilize it twice a year with a citrus fertilizer (Jobe's Fruit and Citrus 3-5-5), and it's watered with automated irrigation tubes placed near the roots 2-3 inches below the soil 2 times a week for 5 minutes. I don't do anything besides this. Please take a look at the pictures below. Thanks in advance! Norm

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Certified GKH Gardening Expert
Answered on December 19, 2016

The sooty deposit on the leaves is very likely sooty mold, a fungus that grows on honeydew secreted by insects like aphids or scale bugs that attack plants. See this article for tips on controlling it:

Some of the other problems you're seeing, like the curling leaves and non-vibrant leaves, could be caused by the insects that are producing the honeydew. Check the tree carefully for any aphids or scale insects:

I see a brown spot on one of the leaves surrounded by a yellowish area. That, along with the branch that's lost its leaves, can be a sign of Alternaria brown spot, a fungal disease of citrus. See this article for more information:

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