Contents: By Damage and Image
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Contents: Alphabetical

alder flea beetle
aphid management
apple and thorn skeletonizer
apple ermine moth
ash whitefly
azalea bark scale
azalea lace bug
azalea sawfly
Bagrada bug
bark lice
Barypeithes root weevil
Beneficial nematodes
biocontrol of root weevils
birch aphid
black bean aphid
black cherry aphids
black stem borer
bluegum psyllid
Boisduval scale
branch and twig borer
brown marmorated stink bug

bronze birch borer
boxwood leafminer
boxwood psyllid
bulb flies
cabbage whitefly
carnation tortrix
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

crane flies
cypress tip moth

dogwood sawfly
Douglas fir sawfly
Douglas fir twig weevil
elm leafminer
European pine sawfly new
European pine shoot moth
European wool carder bee
emerald ash borer
Fall webworm
fir coneworm new
flatheaded cedar borer
ground beetle gallery
Hemerocallis gall midge new
hollyhock weevil
honeylocust plant bug
honeylocust pod gall midge
Heliothis phloxiphaga
holly bud moth
huckleberry root aphids
ground mealybug
Japanese beetle
lady beetle gallery
leaf weevil
light brown apple moth
Linden aphid new
lupine aphid new
Macrosiphum rhamni new
maple aphids
maple tip moth
maple midge
March flies
mountain ash sawfly
Myzocallis sp. on red oak new
Narcissus bulb fly
natural enemies gallery
oak ambrosia beetle
oak slug
oak twig gall wasp
obscure root weevil
Pacific flatheaded borer
peach tree borer
peach twig borer
pear blight beetle
pear psylla
pear leaf-curling midge
pear sawfly
pine needle scale
pine and cone spittlebug
poplar and willow borer
Psyllopsis fraxinicola
rose curculio weevil
rose midge
rove beetle gallery
rose stem girdler
sequoia pitch moth
soldier beetle gallery
snapdragon plume moth new
snakefly gallery
speckled green fruitworm
meadow spittlebug
spotted asparagus beetle
spruce twig aphid
tent caterpillars
viburnum leaf beetle
violet gall midge
western poplar clearwing
western spotted cucumber beetle
white pine weevil
woolly alder aphid new
woolly ash aphid
woolly beech 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.

Chemical Control:

According to the University of Maryland Pest Predictive Calendar, cottony camellia scale eggs hatch at 856 degree days (base 50 degree F) or around the time of full bloom of smokebush, Cotinus coggygria. In the PNW Nursery IPM alert database, we received alerts about cottony camellia egg hatch (eclosion) occurring on 4/29/2016, 7/3/2011 and 6/23/2009 in the north Willamette Valley. 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 of this scale species 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.

Bee Aware: Use caution with systemic and contact insecticides to avoid potential insecticide residual during flowering. For more information on bee safety, check out the Pacific Northwest Extension Publication - PNW 591, How to Reduce Bee Poisoning from Pesticides (free downloadable pdf).

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:

Doubrava, N. et al. 2015. Camellia Diseases and Insect Pests. Clemson Cooperative Extension. <27 April 2016>

Miller, D. et al. 2014. Pulvinaria floccifera. Scale Insects: Identification Tools for Scales of Quarantine Importance. Systematic Entomology Lab. USDA. <27 April 2016).

Raupp, M. 2010. Flocked Hollies: Cottony Camellia Scale, Pulvinaria floccifera. Bug of the Week. University of Maryland. Cottony camellia scale

Cottony camellia scale. PNW Insect Management Handbook.

Orginal publication: 6-22-2009
Latest update: 11-14-2017

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


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 11/14/17


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