Teeny tiny Meyer lemons turn black ... or yellow
I have two Meyer lemons--one in a pot and one in the ground. They are both about 10 years old. Occasionally (like now) some of the fruit turns black or prematurely yellow when it is only about 1/4" to 1/2" in diameter. In the past, this has happened only on the potted tree, I think, but this year I have some tiny black fruit on the tree in the ground as well. Otherwise, the trees look great, the leaves are healthy, and the fruit that does mature is good. I live in Walnut Creek, CA--it gets pretty hot here in the summer and cool (rarely freezes) in the winter.
Anyone have any ideas what's causing this problem?