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 bean aphid new
black cherry aphids new
black stem borer
bluegum psyllid
branch and twig borer
brown marmorated stink bug

bronze birch borer
boxwood leafminer
boxwood psyllid updated
bulb flies
cabbage whitefly new
carnation tortrix new
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
dustywings new
elm leafminer
European pine shoot moth
European wool carder bee
emerald ash borer
Fall webworm
flatheaded cedar borer
ground beetle gallery new
hollyhock weevil
honeylocust plant bug
honeylocust pod gall midge
Heliothis phloxiphaga
holly bud moth
huckleberry root aphids
ground mealybug
Japanese beetle new
lacewings new
lady beetle gallery updated
leaf weevil
light brown apple moth
maple aphids updated
maple tip moth
maple midge
March flies updated
mountain ash sawfly
Narcissus bulb fly updated
Natural enemies gallery new
spruce twig aphid
oak ambrosia beetle
oak slug
oak twig gall wasp new
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
Psyllopsis fraxinicola updated
rose curculio weevil
rose midge
rove beetle gallery new
sequoia pitch moth
soldier beetle galleryn new
snakefly gallery new
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

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Boxwood leafminer

The boxwood leafminer, Monarthropalpusi flavus (Schank), is a key pest of boxwood. There is one generation a year with the larvae overwintering in the mined tissue of the leaves. The larvae resume feeding in the spring. The adult emergence in the Pacific Northwest occurs in late April through May and is associated with the timing of bloom of weigela, Weigela florida, and ranges from 300 to 650 degree days. Adults emerge, mate, and the female lays eggs deep into the tissue on the underside of the boxwood leaves. The eggs hatch in about three weeks and the larvae begin to feed causing the mining damage. The Below are some useful links for further information on this insect.

Oregon State University boxwood leafminer fact sheet with regional information

Penn State's Woody Ornamental IPM: Boxwood leafminer fact sheet. Both html and pdf versions are available. Includes images, information on resistant varieties, and management.

North Carolina State University Extension: Boxwood leafminer fact sheet. This publication has nice images of the adult leafminer and useful chemical management information.

G. d’Eustachio and M.J. Raupp's article in the Journal of Arboriculture, APPLICATION OF SYSTEMIC INSECTICIDES
, has extremely useful information on this insect's phenology and degree day development as well as details on two separate chemical trials on management of these midges.

M.J. Raupp, I.H. Mars, G. d'Eustachio have also published useful info on boxwood leafminer in ISHS Acta Horticulturae 630, INTEGRATED APPROACHES FOR MANAGING THE BOXWOOD LEAFMINER, MONARTHROPALPUS FLAVUS. The abstract details additional work with particular emphasis on resistant cultivars.

S. Gill, P. Shrewsbury, both from the University of Maryland and J. Lutz, Joanne’s IPM, Inc. have also posted their work looking at chemical management of boxwood leafminer, Evaluation of Systemic Insecticides Imidacloprid and Thiamethoxam For Control of Boxwood leafminer

Original publication: 5/4/2006
Most recent update. 5/8/2013

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

Boxwood leafminer damage
boxwood leafminer damage

Boxwood leafminer damage
boxwood leafminer damage

Boxood leafminer damage
boxwood leafminer damage

Photo: IPM images/John Weidhass
Boxwood leafminer damage on a branch
boxwood leafminer damage on branch
Boxwood leafminer damage
boxwood leafminer damage on leaf

Boxwood leafminer larvae
boxwood leafminer larvae

Boxwood leafminer pupa
boxwood leafminer pupa
Emerging boxwood leafminer adults
emerging boxwood leafminer adults
Website editor:
Robin Rosetta

Page last modified 5/8/13


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