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Tree Insects
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Updated: February 28, 2023
Lace Bugs on Trees and Shrubs
Lace bugs hide on the underside of leaves of mostly azalea, Pieris, and rhododendron evergreen shrubs.
Updated: February 28, 2023
Tree and Shrub Galls
Corky swollen or unusual growths on tree leaves or branches can be caused by mites, bacteria, fungi, or other insects. They are unsightly but not life-threatening.
Updated: February 28, 2023
Borer Insects on Trees
Beetle borers and bark beetles may be the reason gummy sap is oozing from tree branches or trunks.
Updated: February 28, 2023
Conifer Bark Beetles on Trees and Shrubs
There are multiple bark beetles that may cause damage to needled evergreen trees.
Updated: February 28, 2023
Spongy (Gypsy) Moths and Caterpillars on Trees
Caterpillars of spongy moths are a serious pest of oak trees in Maryland.
Updated: February 27, 2023
Japanese Beetles on Trees, Shrubs, and Flowers
Larvae or grubs feed on the roots of Kentucky bluegrass, fine fescues, and other grasses. Adults are brown beetles with metallic green heads that emerge mid-June and feed on more than 275 plant species.
Updated: February 27, 2023
European Hornets
The European hornet is the only true hornet in the United States. The notches on the abdomen distinguish it from the Asian Giant Hornet ("murder hornet"), which is not present in Maryland.
Updated: February 27, 2023
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.
Updated: February 27, 2023
Aphids on Trees and Shrubs
Aphids are small green insects that suck plant juices from almost all plants at one time or another.
Updated: February 27, 2023
Cicadas 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.
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