This year only one flower bloomed. Leaves are large green but now seem to have a soft white look On them, is it mold? If so how do I correct it.
I'm not completely sure, but I think you are referring to the gerbera... This does seem to be a powdery mildew issue. You can use neem oil to kill off the disease. This is the most likely cause for your lack of flowering.
This article will help you with the care of the plant: https://www.gardeningknowhow.com/ornamental/flowers/gerbera-daisy/growing-gerbera-daisies.htm