Relevant background:

I purchased and repotted (into 1.5 gallon containers) 2 meyer lemons, a calamondin orange and a Moro blood orange about a month ago.

A week after repotting, the calamondin and one of the meyers were looking good, but the other meyer had turned yellow, and the moro had developed yellow spots on some of its leaves.

About a week after that, I started 1 tsp per gallon of Foliage Pro per week. Each tree gets 1/4 tsp per week since I split the gallon between them. They have gotten two doses so far.

The two trees that were doing fine have continued to look good, and are starting to send out new leaves.

The Moro has produced a bit of new growth, but the yellow spots remain.

The meyer that was yellow has turn more green, but has a burned spot on one leaf, and has not produced any new growth so far.

Was this just a matter of lack of nutrients and sun burn? I assume things should be fine from here on out, but I don't really know how to identify infections or pests, so I thought I'd post some images.

Click for larger images

The Meyer:
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The Moro:
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The underside of the Moro leaf:
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