Contents: By Damage and Image
(In progress)
Contents: Alphabetical
alder flea beetle
aphid management
apple and thorn skeletonizer
apple ermine moth
ash whitefly New
azalea bark scale
azalea lace bug
azalea sawfly New
bark lice
Barypeithes root weevil Updated
Beneficial nematodes
biocontrol of root weevils
birch aphid Updated
black stem borer
bluegum psyllid
branch and twig borer
brown marmorated stink bug

bronze birch borer
boxwood leafminer
boxwood psyllid Updated
bulb flies
carpet beetle (images)
Calligraph californica

Ceanothus stem gall moth
cereal leaf beetle
cherry ermine moth
chilli thrips
cinnabar moth
clay colored weevil
cottony camellia scale
cypress tip moth

dogwood sawfly
Douglas fir sawfly
Douglas fir twig weevil
elm leafminer
European pine shoot moth
European wool carder bee
emerald ash borer
Fall webworm
flatheaded cedar borer
hollyhock weevil
honeylocust plant bug
honeylocust pod gall midge
Heliothis phloxiphaga
holly bud moth
huckleberry root aphids
ground mealybug
lady beetle gallery
leaf weevil
light brown apple moth
maple aphids Updated
maple tip moth
maple midge
March flies Updated
mountain ash sawfly
Narcissus bulb fly Updated
spruce aphid on spruce
oak ambrosia beetle
oak slug
obscure root weevil
Pacific flatheaded borer
peach tree borer
peach twig borer
pear blight beetle Updated
pear psylla
pear leaf-curling midge
pear sawfly
pine needle scale
pine and cone spittlebug New
poplar and willow borer
rose curculio weevil
rose midge
sequoia pitch moth
speckled green fruitworm
meadow spittlebug updated
tent caterpillars
viburnum leaf beetle
violet gall midge
western poplar clearwing
western spotted cucumber beetle
white pine weevil Updated
woolly ash aphid
woolly beech aphid Updated

Back to Home

Contact Us

Aphid (Midarus obliquus.) on spruce

These small woolly aphids, also called spruce woolly aphid or the primitive woolly aphid, can be found on the terminals of Picea glauca 'Conica'. They cause damage similar to Balsam twig aphid with twisted new growth. Severe infestations cause deformation of the terminals.

They overwinter in the egg stage. In 2006, the aphid egg hatch, or eclosure, occurred in Oregon in early April. In 2011, the aphids were spotted in May.

This aphid produces a waxy covering and can be difficult to control. Early management in the spring is recommended. Use of a selective aphidicide will help preserve many of the natural enemies that attract to feed on these aphids. Those natural enemies include ladybeetles, hoverfly larvae, lacewings, and parasitic wasps such as Pseudopraon sp.

Web resources:

Day, Eric. 2009.BALSAM TWIG APHID Homoptera: Aphididae, Mindarus abietinus. This website has information on a similar aphid which might be helpful with management of this lesser known aphid.


Orginal publication: 5/8/2006
Latest update: 5/3/2016


Author: R.L. Rosetta, Extension Nursery Integrated Pest Management, Department of Horticulture, Oregon State University


Aphid damage on dwarf Alberta spruce
Aphid damage on dwarf Alberta spruce

More severe damage from the aphid can be seen on the center plants which appear a bluish-gray color due to the wax produced by the aphid
aphid damage on dwarf Alberta spruce

Wingless aphids on Picea glauca conica
Mindarus aphid on spruce

Aphid on spruce
Mindarus aphid on spruce
Close-up of aphid
Mindarus aphid on spruce
Website editor:
Robin Rosetta

Page last modified 5/4/16


Before applying any of the information found on this site, please read our disclaimer.
Copyright © 2016, All Rights Reserved