Behavioral responses of Frankliniella occidentalis to tomato plants infested with Tetranychus urticae and analysis of the volatile compounds of tomato plants
Author of the article:WEN Juan** ZHI Jun-Rui*** Lü Zhao-Yun LI Shun-Xin
Author's Workplace:Institute of Entomology, Guizhou University, Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region, Guiyang 550025, China
Key Words:Tetranychus urticae, Frankliniella occidentalis, tomato, plants selectivity, volatile
Abstract:[Objectives] To investigate the effects of tomato plants infested with Tetranychus urticae on the behavioral responses of Frankliniella occidentalis. [Methods] The behavioral responses of F. occidentalis to tomato plants infested with different densities of T. urticae for different periods of time were tested in a four-armed olfactometer. Volatiles emitted by tomato plants with different densities of T. urticae were identified by GC-MS and compared. [Results] The preference of F. occidentalis for tomato plants infested with T. urticae was closely related to the period of infestation and density. F. occidentalis was more likely to select tomato plants with a moderate amount of damage. Volatile compounds differed among tomato plants with different densities and durations of infestation by T. urticae; Aromadendrene. O-Cymene, 2-Methyl-1-Butanol and (E)-2-Hexenal were only emitted by plants with a relatively high degree of damage. M-Cymene and O-Cymene could be repellent to F. occidentalis, whereas P-Cymene and 1-Octen-3-ol are attractive to this species. [Conclusion] F. occidentalis were most attracted to tomato plants that had sustained moderate damage from T. urticae. Different densities and durations of infestation by T. urticae affected the volatile compounds emitted by tomato plants.