Pansy diseases are very difficult to deal with once they appear. The photo is of a very severe case of crown rot. The first thing to do is remove all infected plants. Second is to check the overhead watering and make sure the plants are not staying wet over night and they are having a chance to dry out.
Pansies should be planted in well prepared soil with good drainage.If your planting is of a large number I would suggest having a ph test done.
Pansies are the best winter flowers for North Texas
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