Relationship between the Occurrence of Tomato Spotted Wilt Virus and the Number of Frankliniella occidentalis in Zhaotong Tobacco Fields

PurposeTo verify the occurrence of tomato spotted wilt virus (TSWV) in three tobacco fields in Zhaotong, and its relationship with the number of dominant thrips that transmitted the virus.

MethodWith plate beating and blue sticky trap, the five points sampling method was used to survey and record the species and the number of thrips, the occurrence rate of TSWV in Zhaotong tobacco fields was also investigated, and the relationship between the virus and the thrips population was analyzed.

ResultThe major thrips species in Zhaotong tobacco fields were: Frankliniella occidentalis, F. intonsa, Thrips tabaci and T. palmi, among which F. occidentalis was the dominant species, accounting for 81.97% of the total thrips collected. The peak seasons of the F. occidentalis was found in June to July, the results of plate beating and blue sticky trap showed that the cumulative number of F. occidentalis in high-incidence fields was significantly higher than those in the medium-and low-incidence fields (P<0.05), which could reach 3 to 4 times of the low-incidence fields; the number of F. occidentalis on the pheromone blue board (1204.08±194.76) heads/board could reach 2.39 times of the common blue board (503.59±55.63) heads/board, it’s indicate that pheromone blue board had better trapping effect than common blue board. The incidence of TSWV in the three tobacco fields was low at root extending stage (early May to early June), and it’s gradually increases at rapid growth and maturity stages (early June to early September), the occurrence rate of TSWV was between (4.03±0.68)% (low-incidence fields) and (9.01±1.37)% (high-incidence fields). The results of correlation analysis showed that the occurrence rate of TSWV and F. occidentalis population in Zhaotong tobacco fields had a significant positive correlation, which the correlation coefficient was between 0.874 and 0.977.

ConclusionThe occurrence of tomato spotted wilt virus was closely related to the number of F. occidentalis in Zhaotong tobacco fields, “Pest control” is beneficial to control the occurrence of tomato spotted wilt virus.