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

bronze birch borer
boxwood leafminer
boxwood psyllid
bulb flies
carpet beetle New
Calligraph californica
caterpillars

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

dogwood sawfly
Douglas fir sawfly
Douglas fir twig weevil
earwigs
elm leafminer
European pine shoot moth
European shot-hole borer
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
lacebugs
lady beetle gallery
leaf weevil
light brown apple moth
maple tip moth
maple midge
March flies
mountain ash sawfly
spruce aphid on spruce
oak ambrosia beetle
oak slug
obscure root weevil
Pacific flatheaded borer
peach tree borer
peach twig borer
pear psylla
pear leaf-curling midge
pear sawfly New
pine needle scale
poplar and willow borer
rose curculio weevil
rose midge
roseslug
sawflies
scale
sequoia pitch moth
speckled green fruitworm
spittlebug
tent caterpillars
thrips
viburnum leaf beetle
violet gall midge
western poplar clearwing
western spotted cucumber beetle
white pine weevil
whiteflies
woolly ash aphid

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Rose midge

The rose midge, Dasineura rhodophaga Coquillett (Diptera: Cecidomyiidae) is an uncommon but damaging pest of roses. Damage from the midge was first reported in 1886 in New Jersey. There are accounts of its infestation in the Pacific Northwest, California, the Northeastern states, Colorado, Illinois, Ohio, Wisconsin, and the Canadian provinces of British Columbia and Ontario. The distribution and occurrence of the midge will likely increase. The adult midge lays its eggs inside the sepals of new flower and leaf buds. The tiny maggot that hatches feeds in these areas causing blackened tissue, tip abortion, and distorted flower buds.

In 2004, the first damage of the season was reported on April 13 at the International Rose Test Garden (IRTG) in Portland, Oregon. Rose midge damage tends to increase through the season. Sampling of new shoots during the 2004 season showed two peaks of damage: in late June/early July and late August/early September.

Our work with rose midge in 2005 at the IRTG comparing one "pre-emergent" application of Merit (imidacloprid) and Tempo (cyfluthrin) applications begun in April and applied every two weeks throughout the growing season (12 applications) showed statistically equivalent control between the two treatments. Both treatments kept damage around 2% while the untreated control had 54% damaged buds.

For more details on the 2005 trials, see the Final Report of Investigation of Phenology and Management of Rose Midge, Dasineura
rhodophaga
.

Dr. Janice Elmhirst, in British Columbia, has been doing research with rose midge as well. More information on her trials, including using biological control agents such as beneficial nematodes and predatory mites is available at the links below.

Final Report on Rose, Salix and Acer Midge Trials in British Columbia 2004

Evaluation of chemical and biological treatments for control of rose midge
(Dasineura rhodophaga Coquillet): efficacy and crop tolerance.

Cultural control
Rose midge may be moving into new sites/plantings via infested plants, particularly the difficult to detect larval/pupal stage in the soil. One method to reduce the risk of introduction of this pest is to buy bare root roses or to discard the soil and rinse the roots of plants brought in from infested sites. There is anecdotal evidence that removing the mulch at the end of the growing season in the late fall and replacing with fresh mulch may remove the overwintering stage of the midge which generally is quite shallow, in the top 1-2" of soil.

 

rose midge early season damage

rose midge early season damage
feeding damage
rose midge early season damage
distorted leaf shoot
rose midge larvae under sepal

rose midge larval feeding and damage
larval feeding
rose midge larval feeding and damage
larval feeding
tip abortion
tip abortion
tip damage
tip damage
bud damage
bud damage
bud damage
bud damage
Website editor:
Robin Rosetta

Page last modified 4/16/12

 

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