QuestionI replanted my diffenbachia about 2 months ago. Shortly afterwards I started noticing these flying pests on and around the plant. They are almost like 'fruit flies'. What can I do to get rid of them? The plant has already started a new leaf so I think the plant is doing well.
AnswerLinda,
Hard to say for sure but it sounds like dark-winged fungus gnats (see http://www.livingwithbugs.com/fungus_gnat.html for a picture of the adult fly). The larvae live in the soil and feed on fungi. The re-potting may have stimulated some kind of emergence of the adults. If the plants seem otherwise healthy you probably don't need to do anything.
Jack DeAngelis
http://www.livingwithbugs.com
Also visit my blog at http://livingwithbugs.blogspot.com/index.html for updated home and garden pest news.