Jamie, we will need more info from you in order to provide you with a useful diagnosis....what region are you living in what conditions are the trees growing in (in gound/pots/raised beds etc) what recent changes can you identify if any (rainfall/temp/strong winds/irrigation)
Generally foliage changes and leaf drop in citrus are indicative of deficiencies in the soil of required elements..exactly which elements can be determined by the exact pattern of the discolouration. The symptoms you describe are also common to a wide range of enviromental factors not necessarily related to soil composition, so as I said more info please...also a pic or two if you can would be most helpful.
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We fell them down and turn them into paper,
That we may record our emptiness.
- Kahlil Gibran
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