Abstract
A study on the variation of species diversity and sex ratio of thrips in winter wheat (Triticum aestivum L.) was conducted at the Lithuanian Institute of Agriculture (currently – Lithuanian Research Centre for Agriculture and Forestry). Assessments of thrips abundance were carried out from the beginning of tillering (growth stage (GS) 21) until complete maturity (Gs 89). Thirteen thrips species belonging to the three families were identified: 10 thrips species belonged to Thripidae, 2 to Phlaeothripidae and 1 to Aeolothripidae families. In terms of the feeding group, one species (Aeolothrips intermedius) belonged to zoophagous, the rest of the species were phytophagous. Frankliniella intonsa, F. tenuicornis, Haplothrips aculeatus and Limothrips denticornis were the earliest thrips species identified on winter wheat in spring. The dominating species were L. denticornis (41.3%), H. aculeatus (25.8%) and F. tenuicornis (20.5%). An average sex ratio of L. denticornis was 84.7%, and of H. aculeatus – 68.2%, and of F. tenuicornis – 71.1% and of F. intonsa – 60.9%.
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