不同花色菊花品种上西花蓟马种群密度及雌雄性比

为明确不同花色菊花品种上西花蓟马Frankliniella occidentalis发生情况及种群变化规律,利用蓝色粘虫板调查了大棚种植的7种单色(黄色、橙色、白色、绿色、粉色、紫色、红色)以及4种双色(黄绿、黄红、白绿、黄白)菊花品种上不同时期西花蓟马的种群密度及雌雄性比。结果表明,根据四分位法得到西花蓟马的发生早期与菊花苗期重合,主要发生期与菊花开花期重合,发生晚期为切花后生长期。在所有单色菊花品种中,西花蓟马在黄色菊花品种上的种群密度最高,主要发生期虫口密度达19.98头/板;且雌雄性比最大,为5.85,显著高于其它单色菊花品种上的雌雄性比。在所有双色菊花品种中,黄绿菊花品种上的西花蓟马种群密度最高,主要发生期虫口密度达26.89头/板,显著高于其它双色菊花品种上数量,且雌雄性比也最大,为6.87。菊花开花是导致西花蓟马种群迅速上升和种群中雌虫比例迅速增加的主要原因,且西花蓟马偏好为害与黄色花色相关的菊花品种。

Population density and sex ratio of western flower thrips Frankliniella occidentalis on chrysanthemum cultivars of different flower colors

The aim of this study is to describe population densities and population dynamics of western flower thrips Frankliniella occidentalis on chrysanthemum cultivars with different flower colors under greenhouse conditions. Seven different chrysanthemum cultivars with single-color (yellow, orange, white, green, pink, purple, red), and four cultivars with bicolored flowers (yellow-green, yellow-red, white-green, yellow-white) were investigated using blue sticky boards. The results showed that, according to the quartile method, the early occurrence stage of F. occidentalis coincided with the chrysanthemum seedling stage; the main occurrence stage was overlapped with the flowering period of chrysanthemum, and the late stage of F. occidentalis followed cut flower growth period. The chrysanthemum cultivar with yellow colored flowers hosted the highest population and its density reached to 19.98 thrips per sticky board during the main active season of F. occidentalis, and also had the significantly highest female:male ratio 5.85 among all of the single-colored cultivars during flowering. Densities on mixedcolor chrysanthemum cultivars were generally higher, with the yellow-green flowers hosting the signifi-cantly highest population density and its density reached to 26.89 thrips per sticky board during the main active season, and the highest female:male ratio was 6.87, also on yellow-green flowers. Yellowgreen flowers hosted the significantly highest population densities and female:male ratio on all of them. Flowering was the main reason for the rapid increase in F. occidentalis population densities and female-skewed sex ratios. Frankliniella occidentalis preferred to settle on chrysanthemum with yellow flower color, even when mixed with other colors.