Abstract: 【Aim】 This study aims to explore the phototaxis of Sitodiplosis mosellana adults to linearly polarized light. 【Methods】 The phototatic rate of S. mosellana adults to the linearly polarized and unpolarized light was tested with a self-designed Y-tube device in the laboratory. Field tests were also carried out to compare the numbers of S. mosellana adults trapped by the linearly polarized and unpolarized UV light traps. 【Results】 The results showed that the phototatic rates of S. mosellana adults to linearly polarized and unpolarized light were 47.23% and 20.31%, respectively, with obvious difference between them. The highest number of S. mosellana adults (60.20) was trapped by horizontally linearly polarized light, and then by vertical linearly polarized light (37.60) and by unpolarized light (25.60), and there was obvious difference between the numbers of adults trapped by horizontally linearly polarized light and by unpolarized light. 【Conclusion】 The preference of S. mosellana to linearly polarized light is stronger than to unpolarized light. Horizontally linearly polarized UV light shows significantly higher trapping efficiency to S. mosellana than unpolarized light.  

Key words: Key words: Sitodiplosis mosellana, linearly polarized light, unpolarized light, behavior, phototatic rate