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Summary Thrips major is a polyphagous insect, which occurs on each continent. In Poland T. major usually attacks crops, ornamental plants and herbs. Although it is very common pest, there are only few fragments of its sequence available. Knowledge about its rDNA (ribosomal deoxyribonucleic acid) sequence is needed to develop new diagnostic methods that could allow for successful differentiation between T. major and other thrips species such as Frankliniella occidentalis and Thrips tabaci, which post higher risk to cultivations in Poland. The aim of this work was the characterization of rDNA sequence of T. major, its comparison with other thrips species’ sequences followed by phylogenetic analysis. In this work new PCR (polymerase chain reaction) primers were designed which enabled rDNA fragment amplification from most of Thripinae subfamily species. PCR reaction was carried out and obtained products of amplification were sequenced, followed by bioinformatic analysis. Then, T. major 18S-ITS1-5,8S-ITS2-28S rDNA region sequences were compared with already known sequences of following thrip species: T. tabaci, T. palmi, Scirtothrips dorsalis, Echinothrips americanus, Frankliniella schulzei, F. occidentalis and F. intonsa and phylogenetic analyses were performed.

Characterization of the rDNA sequence of rose thrips (Thrips major Uzel) and its phylogenetic analysis