Other insects which leave behind honeydew include Aphids , Leaf Mealy Bugs and Whiteflies . These insects, however, are easily distinguished by their physical characteristics. Leaves have a black fungus on them . This is probably Sooty Mold , which finds a host in the honeydew left behind by Scale and other insects. When Sooty Mold is present, the upperside of the leaves will be covered with tiny, dark speckles.
Plant growth is slow .
Treatment First, isolate all affected plants in order to prevent any further spread. Next, if the infestation is not too severe, try removing the Scale with a soft-bristled toothbrush which has been dipped in either soapy water or 70 percent isopropyl alcohol. Repeat every six to seven days until Scale has been eradicated. Acephate is available in household insect sprays. However, many of these sprays contain a specific additive which may damage the foliage of African Violets.