Probably some kind of true bug (Hemiptera) or beetle; moths and butterflies tend to lay eggs singly.

You might have to sacrifice that branchlet in order to hatch them out and grow to an identifiable size. Or perhaps someone recognizes a tell-tale color and pattern of the egg-laying.

You did not post this recently on the Citrus Forum, someone there may be more likely to recognize the eggs.

Thanks Larry. Sounds more like some pest bugs. I will get ride of them.