Thrips spp. in greenhouses in the North-West of Russia
Thripses are very important at present. The complex of greenhouses thrips in North-Wester Russia is presented at this work. Critical situation is to invasive species of thripses - western flower thrips <i>Frankliniella occidentalis Perg. </i>and american thrips <i>Echinothrips americanus Morgan. </i>Western flower thrips was found in our country in 1989 and now it's prediominant on vegetables and ornamental crops in greenhouses North-Wester Russia. American thrips was recently discovered in hothouses of Saint-Petersburg, but he populates the great number of plants. Also the problem of invasive thrips is very actual at this moment.