A number of Bonsai Club members and I are experiencing clorotic symptoms on our locally collected blueberry plants. The leaves at the end of the branches are chlorotic, no evidence of insects/disease. Plants are in a mix of calcined clay, granite grit or haydite and pine bark fines. They are fed regularly. We are aware that acidic conditions are needed but soils have not been tested. Are you aware of any disease in the area that could be the cause of this problem? any other advice, please? Thanks very much. Ray Mack