I would really appreciate advice on how to treat my poor diseased bromeliads. At the end of the summer I began to notice spots on some of my bromeliads. The spots are pale and some have a black dot in the center. The spots look much the same on the underside of the leaves. The bromeliads pictured are billbergia pyramidalis and they seem to be the ones mostly effected. I am not sure what the cause is, but I sprayed them with Daconil (chlorothalonil) mixed at a rate of one tablespoon per gallon. Their appearance has not changed much since then. These are growing outside in my central Florida garden.