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Integrated Pest Management Program

Department of Plant Science and Landscape Architecture, Department of Extension

Fact Sheets > Nursery > Insects

Common Pests Found on Selected Host Ornamental Plants

Andromeda: lace bugs, southern red mite, two-spotted spider mite, black vine weevil

Arborvitae: arborvitae leafminer, bagworms, spruce spider mite, Fletcher scale, hemlock looper, strawberry root weevil

Azalea: azalea bark scale, azalea leafminer, azalea whitefly, black vine weevil, lace bugs, rhododendron borer , azalea sawfly, two-banded Japanese weevil, southern red mite  

Beech: woolly beech aphid, beech scale, cankerworms, two-lined chestnut borer, oystershell scale, maple leaf cutter, horntail 

Birch: aphids, birch leafminer, bronze birch borer, cankerworms, birch sawfly, forest tent caterpillar, fall webworm, Japanese beetle, lace bugs, leafhoppers, European hornet  

Boxwood: boxwood leafminer, oystershell scale, boxwood psyllid  

Cedar: bagworm, spruce spider mite, cedar longhorned beetle  

Cotoneaster: lace bugs, oystershell scale, eastern tent caterpillar, pearslug sawfly, roundheaded appletree borer  

Crabapple: aphids, leafhoppers, leafrollers, leafminers, eastern tent caterpillar, Japanese beetle, fall webworm

Dogwood: dogwood borer, oystershell scale, cottony maple scale, dogwood sawfly  

Euonymus: euonymus scale, euonymus caterpillar  

Fir: balsam twig aphid, balsam gall midge, spruce spider mite, hemlock looper, spruce budworm, balsam woolly adelgid, cooley spruce gall adelgid  

Flowering fruits: (Cherry, Pear, Plum, Peach, Almond) aphids, European red mite, eastern tent caterpillar, fall webworm, peach tree borer, oystershell scale, white prunicola scale, pearslug sawfly, two-spotted spider mite, leafrollers, lace bugs  

Hemlock: elongate hemlock scale, hemlock eriophyid mite,spruce spider mite, hemlock woolly adelgid, black vine weevil, hemlock looper, gypsy moth, hemlock needle miner  

Holl:y holly leafminers, inkberry leafminer, southern red mite  

Honeysuckle: aphids, clover mite, two-spotted spider mite, cottony maple scale  

Honeylocust: honeylocust mite, honeylocust podgall midge, honeylocust gall midge, honeylocust plant bug, cottony maple scale

Juniper: arborvitae leafminer, juniper scale, juniper webworm,spruce spider mite, bagworms  

Larch: larch casebearer, larch sawfly, larch woolly adelgid, hemlock looper  

Lilac: eastern tent caterpillar, lilac borer, lilac leafminer, oystershell scale, white peach scale, European hornet

Linden: aphids, Japanese beetles, lace bugs, two-spotted spider mite, cankerworms, linden looper, linden borer, gypsy moth  

Magnolia: magnolia scale, tuliptree scale, aphids  

Maple: aphids, maple gall mite and rust mite (eriophyids), twig pruner, maple petiole borer, maple leaf cutter, cottony maple scale, forest tent caterpillar, gypsy moth, leafhoppers

Mountain ash: European red mite, mountain ash sawfly, lace bugs, pearslug sawfly, roundheaded appletree borer, Japanese beetle 

Mountain laurel: black vine weevil, rhododendron borer, rhododendron stem borer, lace bugs, mulberry whitefly  

Oak: gypsy moth, kermes oak scale, lecanium scale, oak leaf gall, oak leaf skeletonizer, twig pruner, two-lined chestnut borer, oak leafroller, oak leaf tier, cankerworms, oak spider mite, forest tent caterpillar, lace bugs, periodical cicada  

Pachysandra: oystershell scale  

Pine: aphids, European pine shoot moth, pales weevil, pine bark adelgid, pine eriophyid mites, pine needle scale, pine sawflies, pine false webworm, spruce spider mite, white pine aphid, white pine weevil, pine looper, pine webworm, spittlebugs  

Poplar: Japanese beetle, aphids, forest tent caterpillar, fall webworm, gypsy moth, poplar and willow borer, clearwing borers, imported willow leaf beetle, oystershell scale, two-spotted spider mite

Privet: privet rust mite (eriophyid), white peach scale, lilac leafminer  

Rhododendron: azalea bark scale, rhododendron whitefly,black vine weevil, European hornetlace bugs, rhododendron borer, rhododendron gall midge, two-banded Japanese weevil, southern red mite  

Rose: aphids, Japanese beetle, leafhoppers, rose chafer, roseslug sawfly, scales, two-spotted spider mite

Spruce: Cooley and Eastern spruce gall adelgids, spruce budworm, spruce bud scale, spruce gall midge, white pine weevil, hemlock looper, spruce spider mite 

Sycamore: aphids, lace bugs, sycamore plant bug

Taxus:black vine weevil, taxus mealybug, cottony taxus scale, rust mite, taxus bud mite

Viburnum: scales, snowball aphid, viburnum leaf beetle, tarnished plant bug, thrips, lace bugs

Willow: imported willow leaf beetle, aphids, oystershell scale, poplar and willow borer

Please contact your local Cooperative Extension Center for chemical and other management options or visit the on-line guides of Cornell University and Penn State.  Note: This information may not apply to your state or other geographical area.

Updated by Donna Ellis, Senior Extension Educator, UConn IPM Program, 2011.

By Roger G. Adams, State IPM Program Leader, Entomologist and Richard J. Packauskas, Entomologist, University of Connecticut.  Taken from Integrated

Pest Management for Insects and Related Pests on Ornamental Plants: A Guide for Arborists and Grounds Keepers.  University of Connecticut Cooperative Extension System publication 94-16.

The information in this document is for educational purposes only.  The recommendations contained are based on the best available knowledge at the time of publication.  Any reference to commercial products, trade or brand names is for information only, and no endorsement or approval is intended. The Cooperative Extension System does not guarantee or warrant the standard of any product referenced or imply approval of the product to the exclusion of others which also may be available.  The University of Connecticut, Cooperative Extension System, College of Agriculture and Natural Resources is an equal opportunity program provider and employer.