A wide spread pest. Damages more than 400 types of plants: solanaceous (tobacco, eggplant, pepper, tomato), cucurbits (cucumber), onion, lettuce, parsley etc. Adults change the place of stay, so the pest spreads quickly.
Firstly damaged plants are those which suffer moisture stress. Usually thrips damages down leaves. Larvae and adults form groups in downside of leaves sucking sap. Pest is rarely met on young leaves and shoots, flowers and fruit. Pest makes yellow points and crosses. Leaves curl. When high pest density, points turn into spots, leaves become yellow and fade. Also excrements (like black points) are found on damaged leaves. Thrips damages also forming sets and they fade. Plants become weak, less lively, smaller, yield is lower. Pest transmits a lot of viruses.
Adults are long 0.8-1.5 mm, yellow to dark brown color. Horns are reddish black, consist of 7 segments, wings and front legs are yellow. Spring females can be dark. Females are usually bigger than males.
Larvae look like imago, size: 0.3-0.8 mm, without wings. Larvae color varies with age from yellowish to greenish.
Protonymph and nymph live in soil, move little.
Temperature not over 40°С and low humidity. Female lays about 100 eggs during life period (20-25 days). Lays one egg to mesophyll. In 6-7 days larvae appear and begin to suck sap. In 7-8 days larvae go into soil and become nonmotile (protonymph and nymph). Then in 4-5 days more adult appears from soil. Generation needs 15-30 days to develop depending on conditions. In greenhouse pest develop from May.
For preventive control use Amblyseius cucumeris and Amblyseius swirskii that kill first instar, Macrocheles robustulis and Hypoaspis miles (Stratiolaelaps scimitus) that kills nymphs. For getting more effect, use nematodes (e.g. Steinernema feltilae). Orius laevigatus and Nesidiocoris tenuis kill adults.
Other control methods of adults include monitoring (yellow and blue traps).