Hosts and Pests of Landscape Plants

Alder (Alnus)

• Aphid
• Fall webworm
• Flea beetle
• Leafminer
• Sawfly
• Tent caterpillar

Andromeda (Pieris japonica)

• Azalea bark scale
• Lace bug
• Root weevil

Apricot, flowering (Prunus)

• Fall webworm
• Peach twig borer
• Peachtree borer
• Spider mite

Arborvitae (Thuja)

• Borer
• Cypress tip moth
• Root weevil
• Scale insect
• Spider mite

Ash (Fraxinus)

• Aphid
• Ash borer
• Carpenterworm
• Fall webworm
• Lecanium scale
• Lilac leafminer
• Oystershell scale

Aspen (Populus tremuloides)

• Aspen blotch miner
• Oystershell scale
• Poplar twiggall fly

Aucuba (Aucuba japonica)

• Aphid

Azalea (Rhododendron)

• Azalea bark scale
• Azalea leafminer
• Azalea sawfly
• Lace bug
• Oblique-banded leafroller
• Root weevil
• Spider mite

Bamboo (Bambusa and others)

• Aphid
• Bamboo spider mite

Barberry (Berberis)

• Lecanium scale

Beech (Fagus)

• Aphid
• Oystershell scale

Bergenia (Bergenia)

• Root weevil

Birch (Betula)

• Aphid
• Apple-and-thorn skeletonizer
• Birch leafminer
• Bronze birch borer
• Carpenterworm
• Fall webworm
• Oystershell scale
• Sawfly
• Tent caterpillar

Black locust (Robinia)

• Aphid
• Locust borer

Black walnut (Juglans)

• Fall webworm

Boxelder (Acer negundo)

• Western boxelder bug

Boxwood (Buxus)

• Boxwood leafminer
• Boxwood psyllid
• Boxwood spider mite
• Holly scale

Butterfly bush (Buddleja)

• Earwig
• Root weevil

California lilac (Ceanothus)

• Ceanothus leafminer
• Root weevil
• Whitefly

Camellia (Camellia)

• Black citrus aphid
• Brown soft scale
• Cottony camellia scale
• Root weevil

Cherry, flowering (Prunus)

• Aphid
• Apple-and-thorn skeletonizer
• Cherry bark tortrix
• Fall webworm
• Oblique-banded leafroller
• Peachtree borer
• Pear sawfly (pear slug)
• Root weevil
• Rose leafhopper
• San Jose scale
• Shothole borer
• Spider mite
• Tent caterpillar
• Western red-humped caterpillar

Chestnut (Castanea)

• European shothole borer

Cotoneaster (Cotoneaster)

• Aphid
• Cotoneaster webworm
• Spider mite

Cottonwood (Populus)

• Aphid
• Azalea bark scale
• Carpenterworm
• Fall webworm
• Satin moth
• Tent caterpillar

Crabapple, flowering (Malus)

• Aphid
• Apple-and-thorn skeletonizer
• Cherry bark tortrix
• Fall webworm
• Leafroller
• Oystershell scale
• Rose leafhopper
• San Jose scale
• Spider mite
• Tent caterpillar

Daffodil (Narcissus)

• Bulb fly
• Bulb mite

Dahlia (Dahlia)

• Aphid
• Cutworm
• Earwig
• Western spotted cucumber beetle

Daphne (Daphne)

• Aphid
• Lecanium scale

Dogwood (Cornus)

• Brown soft scale
• Dogwood sawfly
• Flea beetle
• Lecanium scale
• Oystershell scale
• Rose leafhopper

Douglas-fir (Pseudotsuga)

• Aphid
• Brown soft scale
• Coneworm
• Cooley spruce gall adelgid
• Douglas-fir needle midge
• Douglas-fir tussock moth
• Douglas-fir twig weevil
• Pine needle scale
• Pitch moth
• Silver-spotted tiger moth
• Spruce spider mite

Elderberry (Sambucus)

• Borer
• Leafcutting bee

Elm (Ulmus)

• Aphid
• Bark beetle
• Carpenterworm
• Elm leaf beetle
• Elm leafminer
• European elm scale
• Fall webworm
• Oystershell scale
• Spiny elm caterpillar (mourning cloak butterfly)

Euonymus (Euonymus)

• Cottony camellia scale
• Euonymus scale
• Root weevil

Euphorbia (Euphorbia)

• Aphid

Fir (Abies)

• Balsam twig aphid
• Balsam woolly adelgid
• Bow-legged fir aphid
• Coneworm
• Giant conifer aphid
• Spruce budworm (Western)
• Spruce spider mite

Firethorn (Pyracantha)

• Azalea and rhododendron lace bug
• Cherry bark tortrix
• Root weevil

Forsythia (Forsythia)

• Root weevil

Fuchsia (Fuchsia)

• Aphid
• Cyclamen mite
• Fuchsia gall mite
• Root weevil
• Whitefly

Geranium (Pelargonium)

• Aphid
• Leafroller

Gladiolus (Gladiolus)

• Thrips

Golden chain (Laburnum)

• Aphid
• Laburnum Leafminer
• Spider mite

Hawthorn (Crataegus)

• Apple-and-thorn skeletonizer
• Azalea bark scale
• Cherry bark tortrix
• Fall webworm
• Leafroller
• Pear sawfly (pear slug)
• Scale insect
• Spider mite
• Tent caterpillar

Hellebore (Helleborus)

• Aphid

Hemlock (Tsuga)

• Coneworm and shoot moth
• Hemlock scale
• Hemlock woolly adelgid
• Pine needle scale
• Root weevil

Holly (Ilex)

• Aphid
• Brown soft scale
• Cottony camellia scale
• Holly bud moth
• Holly leafminer
• Leafroller (Orange tortrix)
• Lecanium scale
• Root weevil

Hollyhock (Alcea rosea)

• Hollyhock weevil
• Leafhopper
• Spider mite

Honeylocust (Gleditsia triacanthos)

• Honeylocust plant bug
• Honeylocust pod gall midge

Honeysuckle (Lonicera)

• Aphid

Hydrangea (Hydrangea)

• Root weevil

Iris (Iris)

• Bulb mite

Ivy (Hedera)

• Aphid
• Root weevil
• Spider mite

Japanese holly (Ilex)

• Root weevil
• Spider mite

Juniper (Juniperus)

• Aphid
• Cypress tip moth
• Juniper scale
• Juniper tip midge
• Juniper webworm
• Root weevil
• Spider mite

Kinnikinnick (Arctostaphylos)

• Aphid
• Root weevil

Laurel, Portuguese (Prunus)

• Carnation tortrix
• Peachtree borer

Lilac (Syringa)

• Ash borer
• Lilac leafminer
• Oystershell scale
• Root weevil

Lily (Lilium)

• Aphid
• Lily leaf beetle

Linden (Tilia)

• Aphid
• Fall webworm
• Lecanium scale
• Linden gall mite
• Spider mite

Locust (Robinia)

• Carpenterworm
• Locust borer

Madrone (Arbutus)

• Leafminer
• Root weevil

Maple (Acer)

• Aphid
• Carpenterworm
• Cottony maple scale
• Leafcutting bee
• Maple bladder gall mite
• Maple tip moth (Maple twig borer)
• Oystershell scale
• Root weevil
• Rose leafhopper
• Satin moth
• Western boxelder bug
• Western flower thrips

Mountain ash (Sorbus)

• Aphid
• Apple-and-thorn skeletonizer
• Cherry bark tortrix
• Mountain ash sawfly
• Pear sawfly (pear slug)
• Pearleaf blister mite
• Root weevil
• Tent caterpillar

Narcissus (Narcissus)

• Narcissus bulb fly

Oak (Quercus)

• Carpenterworm
• Oak gall wasp
• Oak leaf phylloxera
• Oak skeletonizer
• Pit scale
• Rose leafhopper
• Western oak looper

Peach, flowering (Prunus)

• Aphid
• Cherry bark tortrix
• Fall webworm
• Leafrollers
• Peach silver mite
• Peach twig borer
• Peachtree borer
• Spider mite

Pear, flowering (Pyrus)

• Aphid
• Apple-and-thorn skeletonizer
• Cherry bark tortrix
• Oystershell scale
• Pear sawfly (pear slug)
• Pearleaf blister mite
• San Jose scale
• Tent caterpillar

Photinia (Photinia)

• Aphid
• Cherry bark tortrix
• Root weevil
• Scale insect

Pine (Pinus)

• Black pineleaf scale
• Coneworm and shoot moth
• Eriophyid mite
• European pine shoot moth
• Giant conifer aphid
• Mountain pine beetle
• Pandora moth
• Pine bark adelgid
• Pine needle scale
• Pine needle sheathminer
• Pine sawfly
• Pine white butterfly
• Powdery pine needle aphid
• Root weevil
• Sequoia pitch moth
• Spider mite
• White pine weevil
• Woolly pine needle aphid

Plum, flowering (Prunus)

• Aphid
• Cherry bark tortrix
• Peach twig borer
• Peachtree borer
• Pear sawfly (pear slug)
• Scale
• Tent caterpillar

Poplar (Populus)

• Aphid
• Azalea bark scale
• Carpenterworm
• Fall webworm
• Oystershell scale
• Poplar-and-willow borer
• Rose leafhopper
• Satin moth

Privet (Ligustrum)

• Lilac leafminer
• Thrips

Quince, flowering (Cydonia)

• Cherry bark tortrix

Rhododendron (Rhododendron)

• Aphid
• Azalea and rhododendron lace bug
• Azalea bark scale
• Carnation tortrix
• Cottony cushion scale
• Lecanium scale
• Rhododendron whitefly
• Root weevil

Rockrose (Cistus)

• Root weevil

Rose (Rosa)

• Aphid
• Fall webworm
• Gall wasp
• Leafcutting bee
• Leafroller
• Raspberry cane maggot
• Red-humped caterpillar
• Root weevil
• Rose curculio
• Rose leafhopper
• Rose midge
• Rose sawfly
• Rose stem miner
• Small carpenter bee
• Spider mite
• Tent caterpillar
• Thrips
• Western spotted cucumber beetle

Sequoia/Redwood (Sequoia)

• Juniper scale

Skimmia (Skimmia)

• Spider mite

Spiraea (Spiraea)

• Aphid
• Snapdragon plume moth
• Spider mite

Spruce (Picea)

• Carnation tortrix
• Coneworm
• Cooley spruce gall adelgid
• Douglas-fir tussock moth
• Hemlock scale
• Pine needle scale
• Silver-spotted tiger moth
• Spruce aphid
• Spruce bud scale
• Spruce budworm
• Spruce needleminer
• Spruce spider mite
• Western webspinning sawfly
• White pine weevil

Sycamore (Platanus)

• Aphid
• Fall webworm
• Sycamore scale

Tulip (Tulipa)

• Bulb mite

Tuliptree (Liriodendron)

• Tuliptree aphid

Viburnum (Viburnum)

• Bean aphid
• Root weevil
• Viburnum leaf beetle

Willow (Salix)

• Aphid
• Azalea bark scale
• Carpenterworm
• Fall webworm
• Flea beetle
• Oystershell scale
• Poplar-and-willow borer
• Satin moth
• Spiny elm caterpillar (mourning cloak butterfly)
• Tent caterpillar
• Willow beaked-gall midge

Witch-hazel (Hamamelis)

• Root weevil

Yew (Taxus)

• Cottony camellia scale
• False spider mite
• Lecanium scale
• Root weevil
• Spruce bud scale