Lantana normally cycles through bloom and non blooming periods but stresses can accentuate the off bloom period. Your plants may need a boost of fertilizer followed by a good watering. Use a turf type fertilizer at a rate of 1/2 cup per 25 square feet. Repeat in 4 weeks. If there is a pest involved the symptoms you described don't point clearly to it. I suggest you snip off some branches with leaves and put them in a zip close bag to take to your County Extension Office for diagnosis. Then an appropriate organic control suggestion can be made.
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