Abstract:In order to investigate the effect of plant volatiles to Dialeurodes citri host location, the relationship between D.citri and host plants was studied from behavioral responses and component analysis. Behavioral responses of D.citri to 14 cultivars of 7 groups of citrus were studied using Y-tube olfactometer. The volatiles of three cultivars were qualitative and quantitative analysed with solid-phase microextraction and gas chromatography-mass spectrometry (GC-MS). The attraction of 10 single volatiles to D.citri was analysed at the dosages of 10-2, 10-4, 10-6, and 10-8 g/mL respectively. The results indicated that Nanfeng mandarin orange was the most attractive cultivar among 14 cultivars while HB pomelo was the least. Nine volatiles were shared by 3 cultivars among 37 main components from 14 cultivars detected. Among the 10 reference samples, γ-Terpinene and R-( + )-Limonene showed the strongest attraction to D.citri at the dosages of 10-8 g/mL and 10-4 g/mL respectively. The results indicated that the leaves volatiles of citrus played a great role in host selection and location of D.citri, and their compound composition and relative concentration affected attraction effect.