Meyer Lemon Tree Problems

Question

after all the fires in california, my usually very productive meyer lemon tree stopped putting out flowers and producing lemons. the leaves turned yellow. i have a plum tree that is nearby that has leaves curling and looks like an aphid problem or fungus. could this aphid/fungus problem be the problem with my lemons. I’m uploading a picture of the lemons which have black steaks on the outside although they still edible.

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Answer 1

Here are some possibilities for the damage:

https://www.gardeningknowhow.com/edible/fruits/citrus/citrus-mite-problems.htm

https://www.gardeningknowhow.com/edible/fruits/lemons/pests-of-lemon-trees.htm

And yes, diseases and insects can invade nearby trees.