Lime-induced Chlorosis

Rhododendron foliage yellows (interveinal) on high-pH soils where iron becomes unavailable. Adjust soil pH to 4.5-6.0 by adding sulfur or acidic organic mulch like conifer needles. Use azalea-specific fertilizers containing iron. Check for proximity to new concrete, which leaches lime into soil.

Manage lime-induced chlorosis by breaking the disease cycle at the points you can control: remove infected tissue and debris, reduce moisture on susceptible foliage, and maintain plant health through proper watering and fertilization. Healthy, well-sited plants resist infection more effectively than stressed ones, so addressing underlying site conditions often solves the problem better than repeated chemical applications.