Pests of the greenhouse
By Christopher Rupp
thrips
-beneficial species include black hunter thrips
and the six spotted thrips
-Most adult thrips are slender, minute (less than
1/20 inch long), and have long fringes on the
margins of both pairs of their long, narrow
wings.
http://www.ipm.ucdavis.edu/PMG/PESTNOTES
/pn7429.html
aphids
• Aphids or "plant lice" are soft bodied pearshaped insects and are generally less than 1/8
inch long.
http://entnem.ifas.ufl.edu/fasulo/woodypest/
aphids.htm
White flies
• Whiteflies are tiny, soft bodied insects
• The adults coat their bodies, particularly their
wings, with this wax-hence the name
"whiteflies
http://www.uckac.edu/whitefly/faqs_about_w
hiteflies.htm
Fungus gnats
• Fungus gnats are tiny flies that don’t bite or
spread human pathogens/diseases. The only
way they can harm us is through frustration as
they invade our houseplants or spring
seedlings.
• the pests can be vectors for plant diseases
http://www.learn2grow.com/problemsolvers
/insectsanimals/insectdamagecontrol/fungus
gnats.aspx
Spider mites
•
• One reason that spider mites become a problem
is insecticides that kill their natural predators.
• classed as a type of arachnid, relatives of insects
that also includes spiders, ticks, daddy-longlegs
and scorpions
http://www.ext.colostate.edu/PUBS/insect/05
507.html
http://ipm.ncsu.edu/ag295/html/beet_armyw
orm.htm
Spodoptera exigua
• the beet Spodoptera exigua moth has a wingspan of 25 to 32 mm.
Its forewings are mottled gray or brown with a pale spot near the center
of each wing.
Its hind wings are white with dark veins and have a fringe-like border.
• Most chemicals cleared for home garden use will not control this pest
adequately.
• XenTari is a biological compound based on spores of the bacteria Bacillus
thuringiensis var.
aizawai (Bt). XenTari works against several species of butterfly and moth
caterpillars that can
cause serious damage to crops.
• Scutello® 2x is a biological compound based on spores of the bacteria
Bacillus thuringiensis
var kurstaki (Bt). Scutello®2x works against several species of butterfly and
moth caterpillars
leaf miner
•
Leaf miners are larvae of various insects: small
black flies, moths, sawflies or beetles, many of
them specific to certain plants.
• The fly that lays the eggs on beets does not lay
eggs on any other plant.
http://yardener.com/YardenersPlantProblemSo
lver/DealingWithPestInsects/PestInsectsOnFlo
wers/Leafminer
Mealy bug
Its body is covered with white waxy threads,
which often make a chemical pest control
little successful.
A female can lay 300 to 500 eggs in a
cotton-like pouch made of wax
threads.
http://www.biobest.be/v1/en/plagen/wolluis.
htm
weevils
Adult vine weevils are 8-12 mm long, have a
grooved, dull black shell
with patches of tiny yellow bristles. As they
are well camouflaged and
only active at night, they are seldom seen. If
they are discovered,
they play dead
http://www.bcbudonline.com/forums/index.p
hp?showtopic=14244
Leaf hopper
• Like the whitefly and the aphid Cicadidae
produce a sticky substance, honeydew.
This substance affects the leaves and fruits by
enabling a fungus to grow on it.
http://www.bcbudonline.com/forums/index.p
hp?showtopic=14244