Tree Insects

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Updated: June 28, 2021

How to Identify, Prevent, and Manage Plant Problems

How to ID, prevent, and manage plant problems in Maryland
no lawn landscape
Updated: July 7, 2021


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.
periodical cicada
Updated: July 6, 2021

Aphids on Trees and Shrubs

Aphids are small green insects that suck plant juices from almost all plants at one time or another.
aphids on rose bud
Updated: July 1, 2021

Why Oak Trees are Declining or Dying

Oak trees are declining for a variety of reasons.
oak decline symptoms
Updated: June 21, 2021

Soft Scales on Trees and Shrubs

Just like armored scales, soft scales are sucking insects of a wide variety of plants that can be challenging to control.
cottony camellia scale
Updated: June 14, 2021

Scale Insects on Hemlock

Several armored scale insects infest hemlock trees.
elongate hemlock scale
Updated: June 14, 2021

Shade Tree Galls

Corky swollen growths on tree leaves or branches can be caused by mites, bacteria, fungi, or other insects. They are unsightly but not life threatening.
leaf gall
Updated: June 14, 2021

Diagnose Dogwood Problems - Chart

Easy to use chart to identify problems with dogwood trees.
Updated: June 8, 2021

Dogwood Insect Pests

Identify insect pests on dogwood trees and find out how to manage them.
dogwood sawfly
Updated: June 2, 2021

Woolly Aphids on Trees

Wooly aphids produce a fluffy white waxy substance on new shoots of crabapple and other trees in the rose family.
woolly apple aphids