Biology
Conifer aphids are often large black aphids that attack only coniferous trees. There are a few species that are smaller, green, and develop powdery white waxy material over their bodies. The large black ones frequently feed on growth tips (leaders) and twigs. As their numbers increase, they produce a sticky liquid secretion called honeydew. This can "rain" on cars, sidewalks, and lawn furniture causing a serious nuisance problem. Honeydew is also a problem in that it serves as a food for the black sooty mold fungus, as well as attracting honeydew-feeding insects such as ants. Conifer aphids that feed on needles often cause curling or twisting of the needles due to toxins in their saliva. Honeydew problems are also associated with these aphids.
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