I have two southern magnolia That I put in the ground about 4 years ago , they where about 18 to 20 in. tall . They are around 7 to 8 ft. tall now & have been doing good up to this year , this past summer the leaves started falling off , there are still leaves on the tree & new leaves are coming in all of the time but the older leaves are turning black around the edge of the leaves , I have put plant food around the trees & have made sure that they have had water , I live in the middle of S.C. Can you help me with this . I would hate to have these trees to die , I would like to save them . Rodney .
Might be pathogenic, might be environmental (for instance salt injury). Not enough information here to tell. Maybe your nearest USDA Cooperative Extension office can help.
Dear Ron B . You may be right because there is nothing here but sand & I know that the ground is very poor . I have got to feed all of the time on all of my plants all summer long . I well check it out & when I find what it is I well let you know , Thank you for the info . Rodney .