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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Polydrusus weevil

Polydrusus impressifrons, also known as the the leaf weevil or pale green weevil, is sometimes found in large numbers in nurseries in the late spring/early summer. This weevil is European in origin and first found in New York in 1906. They are reported to feed on leaves of trees such as apple, birch, black locust, blueberry, elm, linden, oak, peach, pear, plum, poplar, rose, strawberry and willow (Beers et al, 2003; Rosetta, personal observation). They are rarely considered a pest but shade tree growers might want to inspect for terminal feeding and loss. Their feeding can be more of a problem on smaller, liner-sized plant material. Their larvae feed on roots.

References:

Beers, E., M. Klaus, A. Gebhard, S. Cockfield, Rich Zack, and C. O'Brien. 2003. Proceedings of the 77th Annual Western Orchard Pest & Disease Management Conference

 

Very nice shot of the weevil's mandibles can be found at this site (language is French but the picture is universal)

Nice images of various Polydrusus weevil species along with helpful hints to distinguish P. sericeus and P. impressifrons are available at the BugGuide webpage on these weevils.

Adult Polydrusus (image more true to color)
Polydrusus weevil
Side shot of Polydrusus
Polydrusus weevil
Ventral shot of Polydrusus
Polydrusus ventral shot
Mating Polydrusus on river birch
mating Polydrusus
Mating weevils with frass and damage
mating weevils with frass
 
Polydrusus egg mass
Polydrusus egg mass
Photo: Ken Gray
Polydrusus weevil feeding on river birch
Polydrusus on river birch
Polydrusus damage
Polydrusus damage
Ken Gray
Polydrusus damage on river birch
Polydrusus feeding damage
Large numbers of Polydrusus are possible
leaf weevils
Website editor:
Robin Rosetta

Page last modified 5/2/13

 

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