Lemons Have Brown/grey Spots On Them. Like They’re Cracking

Question

It’s been the same for a while, not getting any better or worse. We were expecting them to change to a yellow colour by now but still haven’t. Its our first lemon tree so don’t know much about them.

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Answer 1

I see what looks like the early stages of Citrus scab. This is primarily caused by two different species within the genus Elsinoe. These would be E. fawcetti and E. australis. Either one will require the same control methods. Fungicides and good sanitary practice will be the way forward.

This isn't the only issue that I see, though. I notice what looks like a mild powdery mildew infection. This will have similar treatment to other fungal pathogens.

These articles will help:

https://www.gardeningknowhow.com/edible/fruits/citrus/treating-citrus-scab-disease.htm

https://www.gardeningknowhow.com/plant-problems/disease/get-the-cure-for-powdery-mildew.htm

https://www.gardeningknowhow.com/edible/fruits/lemons/growing-lemon-trees-containers.htm