Aphids, particularly tuliptree aphid, can build up to large numbers, leaving heavy deposits of honeydew on lower leaves. A black, sooty, mold may grow on the honeydew. Use malathion.
Tuliptree scales are brown, oval and may be first seen on lower branches. Scales deposit honeydew which supports the growth of sooty mold. Use dormant oil sprays in spring before plant growth begins. Crawlers are controlled with Sevin.
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|Sooty mold on liriodendron - 32K|