Species diversity and occurrence dynamics of dominant species of alfalfa thrips in Horqin District,Tongliao City
This study aimed to investigate the species diversity of alfalfa thrips and the occurrence dynamics of the dominant species in Horqin District.A systematic study was conducted in mowing and non-mowing alfalfa plots from early July to early September in 2019 and 2020.The results showed that there were 8 species of alfalfa thrips in the area,from 5 genera of 2 families,with Frankliniella intonsa and Thrips flavidulus being the dominant ones.The diversity indices of alfalfa thrips were found to be higher in the mowing plots than the non-mowing ones in the same year,with the Shannon Wiener diversity index(H')and Pielou evenness index(J)being significantly higher in the mowing treatment in both years.The population dynamics of the two dominant species show fluctuations.In the same year,the dynamics were similar in the two plots,and on the same survey date,the abundance of dominant thrips was usually higher in the non-mowing plots.The peak damage period of alfalfa thrips in the local area was from mid-July to late August each year,with the most severe damage occurring in mid-to-late August.Mowing can reduce the abundance of dominant species,but the impact varies in species and years.Meteorological factors,mowing conditions(time and frequency),species and quantities of natural enemies,and alfalfa varieties affected the occurrence dynamics of alfalfa thrips.
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