Re: White cotton under leaf, leaves
Giant Mexican Whitefly, most likely. Won't really hurt the plants. They are hosted on plants, such as hibiscus, and spill over to bananas, citrus, etc. They can be hosed off or wiped off if there is not a lot of them. The start a small spirals of eggs, and mature into flies a little at a time. Best for of control is eliminating the host plants. In San Diego, the cold weather in the winter diminishes their populations, but is a perpetually warm climate such as FL they will continue to multiply.
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