西花蓟马数量与番茄斑萎病毒发生流行的关系

The relationship between Tomato spotted wilt virus disease occurrence and the numbers of Frankliniella occidentalis

入侵性害虫西花蓟马Frankliniella occidentalis是番茄斑萎病毒(Tomato spotted wilt virus,TSWV)的优势传播媒介,为探索媒介昆虫西花蓟马数量与TSWV病害发生之间的关系,通过释放不同数量的西花蓟马传毒媒介,比较周围健康植株的发病率,同时分析植株平均取食疤数、最终西花蓟马数量与植株发病率的相关性。结果表明,西花蓟马数量越多,健康植株TSWV病害的发病率越高,说明媒介昆虫西花蓟马可以加速健康植株TSWV发病。同时,与TSWV发病的曼陀罗植株介导相比,携毒媒介昆虫西花蓟马介导的健康植株发病率更高,发病速度更快,6周后携毒媒介昆虫西花蓟马介导的健康植株发病率高达83.3%。另外,健康植株发病率与平均取食疤数呈显著正相关性(P<0.05),而与西花蓟马最终数量无明显相关性。总之,从源头上控制传毒媒介的数量,可有效防控番茄斑萎病毒病害。

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.