Leaf Trouble

[chalstonsc]

Leaves turning brown around edges, not uniformly, but in places one half to one inch long...crinkly, and rolls inward toward main stem, usually upward toward top of stem, and roll usually brings some one half to one inch portion of still green leaf on both sides of part of leaf edge which has turned brown. Affecting older leaves, not new ones....happened last year around this time when it gets hottest and most humid...when weather cooled last year, leaves stopped developing the brown , curled edge spots. Can anyone tell me what this is and what I might be able to do stop. Foliage has been lush until recently and each plant has 6-8 fruit...want to keep them going if I can. Thanks...