There are many things to consider when keeping our arboretum (or your trees) healthy and vibrant. And just as our arboretum is a diverse collection of trees, so too are the pests that call it home. Below you can find links to some of the leading experts on tree health and some brief descriptions of the pests.
While all pests can cause issues for trees in one way or another, a few species have received a little more “press” recently. Species like the Emerald Ash Borer and the Spotted Lanternfly have become more of a pressing and prevalent pest since they have been introduced to the area. Below is a little more information about these new and frequently talked about invasive species.
Emerald Ash Borer
The Emerald Ash Borer is a small and slender insect with iridescent green color. The larval stages of these species are very destructive, boring paths under the bark of ash trees, giving the species its common name.
Emerald Ash BorerSpotted Lanternfly
The spotted lanternfly is a pest species native to Asia and was recently introduced to Pennsylvania. It is a leaf hopping species that can fly short distances, but its primary means of locomotion is hopping or jumping from plant to plant. The species can stunt the growth or even kill trees by sucking the sap out of plants.
Spotted LanternflyOther Pests To
Look Out For
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Bagworm
Here are some helpful links and guides:Birch Leafminer
Here are some helpful links and guides:
Penn State Extention: Birch Leafminer Factsheet
Boxelder Bug
Here are some helpful links and guides:
Bronze Birch Borer
Here are some helpful links and guides:
Penn State Extention: Bronze Birch Borer Factsheet
Morton Arboretum: Bronze Birch Borer
Missouri Botanical Gardens: Bronze Birch Borer
Brown Marmorated Stink Bug
Here are some helpful links and guides:
Carpenter Ants
Cooley Spruce Gall Adelgid
Here are some helpful links and guides:
Cottony Maple Scale
Here are some helpful links and guides:
Eastern Tent Caterpillar
Here are some helpful links and guides:
Elm Leaf Beetle
Here are some helpful links and guides:
Penn State Extention: Elm Leaf Beetle Fact Sheet
Elm Spanworm
Elongate Hemlock Scale
Here are some helpful links and guides:
Penn State Extention: Elongate Hemlock Scale Fact Sheet
Eastern Spruce Gall Adelgid
Here are some helpful links and guides:
European Fruit Lecanium
European Pine Sawfly
Here are some helpful links and guides:European Pine Shoot Moth
Here are some helpful links and guides:
Penn State Extention: European Pine Shoot Moth Factsheet
Fall Webworm
Here are some helpful links and guides:
Penn State Extention: Fall Webworm Factsheet
Fletcher Scale
Galls on Oak
Here are some helpful links and guides:
Penn State Extention: Galls on Oak Factsheet
Missouri Botanical Garden: Gouty, Horned, and other Twig Galls
Gypsy Moth
Here are some helpful links and guides:
Penn State Extention: Gypsy Moth Factsheet
Hemlock Woolly Adelgid
Here are some helpful links and guides:
Honeylocust Plant Bug
Leaf Galls on Maple
Magnolia Scale
Here are some helpful links and guides:
Penn State Extention: Magnolia Scale Factsheet
Morton Arboretum: Magnolia Scale Information
Mimosa Webworm
Native Holly Leafminer
Here are some helpful links and guides:
Penn State Extention: Native Holly Leafminer Factsheet
Missouri Botanical Gardens: Native Holly Leafminer Information
Obscure Scale
Oystershell Scale
Here are some helpful links and guides:
Penn State Extention: Oystershell Scale Factsheet
US Forest Service: Oystershell Scale Information
Peachtree Borer
Here are some helpful links and guides:
Penn State Extention: Peachtree Borer Factsheet
Missouri Botanical Gardens: Peachtree Borer Information
US Forest Service: Peachtree Borer Factsheet
Pine Needle Scale
Spruce Spider Mite
Here are some helpful links and guides:
Penn State Extention: Spruce Spider Mite Factsheet
Missouri Botanical Gardens: Info on Spruce Spider Mites
Bartlett Tree Experts: Spider Mite Factsheet
Tuliptree Scale
Here are some helpful links and guides:
Penn State Extention: Tuliptree Scale Factsheet
Bartlett Tree Experts: Tuliptree Scale Factsheet
Missouri Botanical Gardens: Magnolia and Tuliptree Scale: Factsheet
Twospotted Spider Mite
Here are some helpful links and guides:
White Pine Weevil
Yellow Necked Caterpillar
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