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We determined the abundance, species composition, sex ratio and seasonal dynamics of thrips on one cultivar of Welsh onion ( Allium fistulosum ) and eight cultivars of onion ( Allium cepa ) in South Poland within three vegetation seasons (2014–2016). Nine species of Thysanoptera were identified on  A. cepa  and  A. fistulosum . Irrespective of the onion cultivar,  Thrips tabaci  was the dominant species (64.4% of all collected thrips specimens), while  Frankliniella intonsa  also occurred in high numbers (28.3%). Conversely, Welsh onion was most often inhabited by  F. intonsa  (62.7%), although  T. tabaci  was also numerous (28.3%). The predatory  Aeolothrips intermedius  accounted for 4.5% on  A. cepa  and 2.9% on  A. fistulosum . In the most numerous species,  T. tabaci, F. intonsa  and  A. intermedius  populations were formed mainly by females. The cultivar most colonised by thrips was Kroll of  A. fistulosum.  The tested cultivars of  A. cepa  demonstrated varying degrees of attractiveness to thrips in the subsequent years. The relationship between populations of  T. tabaci ,  F. intonsa  and  A. intermedius  changed in the subsequent months of the growing season. In June, mainly  T. tabaci  and  F .  intonsa  occurred on onion plants, while from July, the percentage shares of  F. intonsa  and the predatory  A. intermedius  in the thrips population on many onion cultivars increased. The level of attractiveness of  A. cepa  related to onion thrips, which is reported as a main pest of onion, varies depending on the year and cultivar.

Thrips (Thysanoptera) associated with onion (Allium cepa L.) and Welsh onion (Allium fistulosum L.)