Tree Insects

Learn how to identify and manage European fruit lecanium scale insects.

Learn how to identify and manage calico scale insects.

Learn how to identify and manage tuliptree scale insects.

Learn how to identify and manage white prunicola scale, a non-native armored scale insect that can be difficult to manage.

Learn about how scale insects are classified and how they feed, and how to effectively manage populations that cause plant damage.

Leafminers feed between the upper and lower surfaces of a leaf.

Caterpillars of spongy moths are a serious pest of oak trees in Maryland.

The emergence of Brood X of the 17-year periodical cicadas will occur in the spring of 2021. This page covers the biology and behavior of cicadas, what to expect during the cicada emergence, and how to protect young trees from egg laying damage.

Crapemyrtles are widely-grown trees and shrubs, but are vulnerable to several problems. They can be damaged by pests, diseases, and stress from their environment. Learn how to care for these plants and manage conditions that cause damage.

Ubiquitous webs connecting tree branches in spring are usually the work of Eastern tent caterpillars or forest tent caterpillars.