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 pear-shaped 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_whiteflies.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/fungusgnats.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/05507.html

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 cancause serious damage to crops.

• Scutello® 2x is a biological compound based on spores of the bacteria Bacillus thuringiensisvar kurstaki (Bt). Scutello®2x works against several species of butterfly and moth caterpillars

http://ipm.ncsu.edu/ag295/html/beet_armyworm.htm

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/YardenersPlantProblemSolver/DealingWithPestInsects/PestInsectsOnFlowers/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.php?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.php?showtopic=14244