Contents: By Damage and Image
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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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Cottony camellia scale

First described in 1870 by Westwood, the cottony camellia scale, Pulvinaria floccifera (Westwood), shows up most commonly on holly in PNW nurseries and landscapes. It does have a wider host range (at least 35 plant families according to Scalenet) including its namesake camellias, English ivy, euonymous, hydrangea, maple, mulberry, pittosporum, rhododendron and the host by which it is also known, cottony yew scale.

According to the IPM alert database, egg hatch (eclosion) occurred approximately 7/3/2011 and 6/23/2009. This is a key time to control the crawler stage, which is very vulnerable to a range of "softer" pesticides include insecticidal soaps, horticultural oils, and insect growth regulators. Only one generation per year has been noted in the Pacific Northwest.

It has been reported that a 2% rate of oil (versus 1% rate) applied during the dormant stage works well.

Systemic insecticides: Fall timing of imidacloprid gives time for that systemic insecticide to move through the plant to the target tissue by spring. Dinotefuran (Safari) moves more quickly in plant tissue and can be used in the spring. Orthene is reported to have efficacy on this scale as well when used during the dormant stage.

 

Useful links:

Miller, D. et al. 2007. Pulvinaria floccifera. Scale Insects: Identification Tools for Scales of Quarantine Importance. Systematic Entomology Lab. USDA. 6 June 12.

LivingWithBugs.com: Cottony camellia scale

Cottony camellia scale. University of Maryland Landscape Problem Solver

Cottony camellia scale ovisac on holly
cottony camellia scale ovisac
Multiple ovisacs on holly
multiple ovisacs
Photo: Ken Gray
Cottony camellia scale female and developing ovisac
cottony camellia scale female and ovisac
Photo: Ken Gray
Ovisac with eggs exposed
ovisac with eggs
Photo: Ken Gray
Closeup of eggs
cottony camellia scale eggs
Cottony camellia scale crawlers emerging
cottony camellia scale nymphs hatching
Close up of cottony camellia scale nymph
cottony camellia scale nymph
Photo: Jim Young, OSU
Website editor:
Robin Rosetta

Page last modified 6/6/12

 

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