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The interactions between volatiles and selectivity of Frankliniella occidentalis to kidney bean damaged by Tetranychus urticae

Tian Tian;Zhi Junrui;Mou Feng;Institute of Entomology,Guizhou University,The Provincial Key Laboratory for Agricultural Pest Management of Mountainous Region;  
The selectivity of the 2nd instar larvae of Frankliniella occidentalis to different treated kidney beans damaged by Tetranychus urticae females at different densities and times was tested,and the volatiles released from different treated beans were evaluated by GC-MS.The results showed that F.occidentalis was more likely to select bean plants damaged for 4 days,when densities were 10 mites/plant and15 mites/plant,respectively.Thrips' selectivity to bean plants damaged at different times was not significantly different at the densities of 5 mites/plant. F.occidentalis tended to select beans damaged by15 female adults of T.urticae at 3 damaging times by mites.The preference of thrips to plants damaged by 5 mites/plant was worst,which indicated that thrips tended to select plants damaged by higher density of mites.The volatiles among different treated bean plants were different in components and contents to some extent.It was speculated that 1-hepten-3-one,neophytadiene,(Z)-3-hexenyl 2-methyl butanoate,2,6-dimethyl-octane,3-methyl-nonane,and tridecane might be attractive to F.occidentalis; while 1,4-hexadien-3-ol,1-octen-3-ol,2-ethyl hexanol,(E,E)-2,4-heptadienal,β-cyclocitral,and(Z)-3-hexenyl tiglate were repellent to F.occidentalis.
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