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"Adult whiteflies resemble tiny moths and are covered with a white waxy powder. They’re rarely more than 1-3 millimeters long and are typically found on the undersides of leaves. Immature forms have a scalelike appearance and are sometimes mistaken as scale insects." from: http://www.learn2grow.com
Under the leaves of a pitanga tree(Eugenia uniflora).
Thanks to Marcos Rafael Gusmão and Alexandre Berndt who help to identify the insect.