Tree Insects

Fall webworms spin silken nests surrounding tree branches on many shade trees in late summer. These are not the same as bagworms or Eastern tent caterpillars, both of which are a different species.

Degree Days (DD), also termed Growing Degree Days (GDD), measure how much warmth above a certain threshold has accumulated since the beginning of the year.

Dark spots with lighter color edges on maple or tulip tree leaves are caused by a gall midge but are not harmful.

White frothy substance on tender plant stems cover spittlebugs as they suck plant juices.

Tree leaves that appear shriveled and contorted may be the result of plant bug feeding damage.

Many different caterpillars could be eating the leaves of shade trees.

Honeydew, a sugary waste product is produced by many sap-sucking insects. Sooty mold is a fungus that grows on the honeydew.