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Not knowing for sure the extent of your problem, I would venture to guess that your plants may be suffering from powdery mildew. The following article should be of some help to you: https://www.gardeningknowhow.com/problems/get-the-cure-for-powdery-mildew.htm

I found this answer while doing research.

I think the lemon thing may have to do with fact that the lemons we see today bear little resemblance to natural lemons, which are small hard fruits with tough skins and tons of seeds. Also extreeeemly bitter. In an attempt to make more and better lemonade, these nasty little fruits were improved to what we see today, a much better lemon. If you go to buy a lemon tree you'll notice they are all grafted clones. They can't be grown from seed, first of all because 99% of the seeds are inert, and secondly because any seed that does sprout will not produce true to form, but will revert to whatever parent stock the tree was engineered from.

I would water two times a week for at least 15-20 minutes (longer if it has been very hot and dry) so that at least 2-3" of water go in the soil every time you water. This will encourage deep root growth, which will help it survive in the higher temperatures.

I can't find anything that says to remove first year lemons or blossoms. My son has one (in a pot) that he has had for several years that produces heavily and no removal was done. I did find one citrus site that said "Never prune a citrus tree - it will prune itself by developing dead branches, etc." Just remove those.

Sounds like it is too wet - it needs to dry out some between waterings. Here is a link on growing/watering.

https://www.gardeningknowhow.com/edible/fruits/citrus/tip-on-water-requirements-for-citrus-trees.htm

This link tells you when............
https://www.gardeningknowhow.com/edible/fruits/lemons/harvesting-lemons.htm