The links above did not work. Are these the picture you tried to post

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First of all remove the fruit so as not to injure the tree. Both of these trees prefer to be in bush form. that way the leaves protect the trunk from getting sunburned. This can be fatal. You got the best food and the bes soil media choice. Paint the bucket white so that the soil does not heat up and cook the roots. .I have mine in bigger pots but there are those that think I am wrong. Your trees are much larger with your pot the same size as mine. Wait to see what other say. I can't help you on the rust problem.

I would not do any pruning at all untill the trees are bigger but you should wait to see what other say.

My containers not only have drain hole in the bottom but have aeration holes up the side. See pic

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larger bucket with 1/8 inch air holes houses the meiwa tree seen in link below

Here is a link that might be useful: https://plus.google.com/photos/111099372377958308731/albums/profile?banner=pwa

Yes, thank you, that's 2 of the pictures I wanted to post. There is a 3rd of the rust colored leaves.

I wondered if I should remove the fruit. When can I let fruit grow?

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I think this must be the one. To post picture you go to the right side of the picture and you will see a box. with the line " Links to share this photo ". The third link down says " HTML " . Click on that and photobucket will copy it. Go to the gardenweb text box and right click then left click on paste. It will past a paragraph of gobaldygoop . that gobaldygoop is you picture and will show up in the text.

This ,process is harder than growing citrus.

Steve

Whatever that brown stuff on the leaves is, I doubt it's rust. Please try again with a better focused image.

Thank you Steve!

jean001a, sorry about the picture. I will take another and try to post it myself.

Ok I think this may be a better picture of the lime tree leaves.

You can see the dark area on the one. It is the darkest of all the leaves. Some other leaves have it spread out over the leaf more and it is a lighter color.

The other leaf has some damage on the edge. I have a couple more like that. You can also see a white circle outline, like a water stain on the center of the leaf. Maybe it is a water stain, idk. Those are all over both trees.

Thanks for your help!

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I am hoping someone will be able to help with the questions at the beginning of this post.

Thank you!

It would be advisable to leave this tree in bush form. Both grow naturally that way. being that far north it will be easier to provide light in winter

Steve.