We have five citrus trees in our backyard. All of them are fairly young, 6 years down to two years. They are growing well for the most part, and we fertilize 3 times per year with citrustone, but I noticed this on the Cara Cara. Is it chlorosis? We live in southeast Georgia, and the soil is mostly sand. This is the dry season, and we water twice a week with tap water, which has a pH of 8.5+. Will a constant supply of alkaline water cause this, or is something else causing it? Not sure how much the sand/soil buffers the watering. Rainy season starts in June. This is the worst affected, and I've seen a little on the others, but not too much. We had a soil test done 3 years ago and the pH was 4.6. Any suggestions for a cure are greatly appreciated. Thanks, Ed