I'm not sure, as my 2 year old meyer lemon is finally making some little green lemons. I had to bring it inside because of frost warnings and all that. In about 2 weeks the older leaves started yellowing and dropping off. I think it's mostly because it doesn't have full sun like it used to, and maybe because of the cooler temperatures now. Sorry I don't know the answers to your questions.

Not an expert, but if the fruit is yellow...for at least a few days, it should be ready. As for the yellow leaves, some are normal as long as the rest is healthy. But I do use Miracid and Chelated iron on my Meyer lemon every couple of months just to keep it green and healthy, along with slow release citrus fertilizer.

As for the leaves curling, try googling "Citrus Leaf Miners" and see if that could be what it is...my trees and all my neighbors citrus trees have it. Its just one of those things in FL that we have to deal with :o(

Here's a picture of CLM: Good luck and enjoy your first fruit!

Here is a link that might be useful: {{gwi:640669}}

Meyers are difficult, and almost always loose all the leaves for me. I am putting some of my trees in my basement this year. I think my house is too dry and cool and I always get bugs and drop tons of leaves....this is partically due to a lack of watering