Invasion of striped barley shaped bugs
These insects are called barklice (Cerastipsocus venosus). https://www.marylandbiodiversity.com/viewSpecies.php?species=13482
Barklice do not feed on living plants. They feed on lichens, decaying organic matter, dead insects, molds, fungi, and pollen. They are not harmful to trees and shrubs, and no control is necessary.