Thank you for your inquiry. There can be a multitude of reasons for the observations that you made - from nutrient imbalance to disease. Please provide more information to allow us to serve you better.
Information that would be helpful include: age of plant, when symptoms was noticed, images (photos) showing symptoms that you are describing.
You may also obtain assistance at your local Texas A&M AgriLife Extension Service office in Houston county (http://houston.agrilife.org)