Due to the unusual heat yesterday and today, I moved all my trees outside of the greenhouse. I returned this evening to find several of the trees had brown spots on their leaves even though I thought that I had made sure that they were in at least partial shade; Is there anything that I can do to help these leaves? Also, I noticed that two or three of the leaves on my Myer Lemon tree were turning very yellow with a green tint whereas the rest of the tree is very green. Any idea what I should do for this tree? Thanks, Tim.

The two individual leaves that you show are old leaves. Their time has come. The tree is removing nutrients from them to feed newer leaves. There's nothing you can do that will turn them green again. If your Meyer lemon is anything like mine, those leaves will turn completely yellow before they drop off the tree.