Bark Lice on White Pine: Harmless Webbing Insects

Long Island white pines show white substance covering trunks after 4 weeks of extreme heat.

Identification

Bark lice (Archipsocus nomas)—small brown insects living on bark, feeding on fungi, lichens, dead insects. They spin protective silken webs covering trunks overnight. Not parasitic, don't damage tree.

Management

No treatment needed—they're beneficial "clean-up crew." If aesthetically objectionable: 2 tbsp dish soap/gallon water spray, or strong water stream (they'll rebuild). Insecticides work but unnecessary.