Abstract:  The invasive pest， Frankliniella occidentalis， was an advantage transmission vector of Tomato spotted wilt virus （TSWV）. To understand the relationship between TSWV occurrence and the numbers of F.occidentalis， the TSWV\|infectious rates of surrounding plants were compared by releasing different numbers of vectors successively， then analyzed the correlation between plant TSWV\|infectious rate and mean feeding scar number， and final number of F.occidentalis vectors. It was indicated that the more vector numbers， the higher TSWV incidence of healthy plants， which explained that TSWV vector F.occidentalis could obviously accelerate the speed of TSWV\|infectious rate. Meanwhile， transmission rate mediated by TSWV\|infectious vector was higher than that mediated by infectious host plant， and the speed of host plant infection rate had the same pattern， with the result of plant TSWV\|infectious final rate reached 833% after six weeks post\|treatment. In addition， there was significantly positive correlation between the plant TSWV\|infectious rate and the mean number of feeding scar （P<005）， but didnt show the same trend in final vectors number. In the end， controlling vectors number from the beginning could be an important strategy for decreasing TSWV disease occurrence.

Key words: Frankliniella occidentalis, Tomato spotted wilt virus, vectors number, plant TSWV\, infectious rate, mean number of feeding scar