Why are my lemons turning brown?

Question

What is causing the lemons on the tree to turn brown? My tree is about 5 yrs old. I have 2 Meyer trees. Only 1 is having this trouble.

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Answer 1

These look to me like sunburned fruits. Check the following article's section on environmental damage:

http://ag.arizona.edu/pubs/diseases/az1154/#envrn

Alternaria disease is also a possibility. In this case you would see brown parts inside the fruit when you cut them open as well:

http://ipm.ucanr.edu/PMG/r107100811.html