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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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Poinsettia thrips

Poinsettia thrips, also called impatiens thrips, Echinothrips americanus, and can be a risk to greenhouse and nursery-grown plants. The adult thrips are dark in color with segmentation or banding. When held over their body, the base and tips of the wings are grey with a dark section in the middle. The juveniles are white or beige with red eye spots.

Distribution
Bermuda, Canada (south), Mexico, USA (most of the eastern states), but introduced to Europe (Italy, Netherlands, Austria, UK, Czech Republic, South Bohemia) and also Thailand.

Host Plants
According to information at the University of Florida MREC website, "In an experiment in Georgia . . . feeding and reproduction was observed on 40 cultivated and 59 native species." Poinsettias, Irish shamrock, and impatiens are the most common greenhouse-grown hosts in Georgia and have been common on chrysanthemum foliage and flowers and woody ornamentals. The Thrips of California website also lists Dieffenbachia and Syngonium(Araceae), Cardamine hirsuta (Crucifeae), Hibiscus rosa-sinensis (Malvaceae) as host plants.

Biology and behavior
These thrips are generally slow-moving compared to a western flower thrips (WFT). They deposit their eggs inside the leaf tissue. The pre-pupae and pupal stages are on the leaf tissue (versus the soil as is the case for WFT)

Damage
Damage to crops can range from minor to extensive, and production may decrease. This thrips stays lower on the plants, so monitoring cards must be placed in the canopy. On many foliage crops damage was typical of thrips damage, but on Alstroemeria damage was similar to be sun scald but on examination of lower leaf surfaces, colonies of E. americanus were evident. There can be feeding in the flowers.
Management

Biological control:
Biological control has been limited with this thrips species. Neither Orius insidiosus nor A. cucumeris fed upon this species enough to provide control in greenhouses. Macrolophus, and A. degenerans have also been released with no obvious control. Some researchers have had some success with lacewings. Dr. Lance Osborne, at the University of Florida, MREC, reports some success using Franklinothrips.
Chemical control:
Greenhouse populations in Georgia have been reported as susceptible to most insecticides. There are reports of populations on woody landscape plants that are more difficult to grow. Some greenhouse growers have had good success with horticultural oil, insecticidal soap and Enstar (kinoprene - insect growth hormone) mixed together (check for local state pesticide registrations and pre-test for phytotoxicity). There are also reports of control with Beauvaria-based microbial insecticides rotated with an insecticide containing the active ingrediant, 3% azadirachtin (Molt-x).
Links:

North Carolina State University and University of Florida MREC's "Insect and Related Pests of Flowers and Foliage Plants" Echinothrips americanus webpage

University of Minnesota Echinothrips americanus webpage. Images, biology, and host information are available at this website.

Thrips of California: Echinothrips americanus Recognition information at this website.

Anonymous. 2009. National Diagnostic Protocol for Poinsettia
Thrips, Echniothrips americanus.
Department of Agriculture, Fisheries and Forestry, Australian Govenerment. Review date November 2012. Accessed 18 March 2014.

Pest risk assessment Australia

Echinothrips adults and juveniles
Echinothrips americanus
Photo: Lance Osborne
Chrsyoperla rufilabris lacewing feeding on Echinothrips
Lacewing feeding on Echinothrips
Photo: Lance Osborne
Franklinothrips feeding on Echinothrips
Frankliniella thrips feeding on Echinothrips
Photo: Lance Osborne
Website editor:
Robin Rosetta

Page last modified 2/13/14

 

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