CYCO Dr. Repair, LIn Store Location: C7 CYCO Dr. Repair, L CYCO Dr. Repair (3 0 0) treats the yellowing of leaf tissue due to a lack of chlorophyll, known as chlorosis. Possible causes of chlorosis include poor drainage, damaged or compacted roots, high alkalinity and deficiencies of iron and other nutrients in the plant. Left untreated, these can damage plant function and development, shortening photosynthesis and reducing yields.