Abstract: Using Y-type olfactometer, behavior response of female Bemisia tabaci B biotype to three kinds of host plants, volatile extracts, volatile reference compounds, volatile ananogues were studied, and components and contents of volatiles in different host plants were compared as well. The results indicated that: 1） Strong behavior selection reaction of female adults of B. tabaci to tomato leaves and cabbage leaves, and their volatile extracts occured, respectively, whereas no significant behaviour selection to the pepper leaves and their extracts were found, respectively. When odors from the three host plants and their volatile extracts were comparatively tested, the female adults showed the strongest host preference to tomato, followed by cabbage, and then pepper leaves. 2） There were significant difference in volatile profile, components and contents among the three host plants. Volatile quantity of tomato leaves is much more than that of cabbage leaves and pepper leaves. Main components were terpene in volatile extract of tomato (89.8%), but hydrocarbon in volatile extract of cabbage (53.0%). 3) Among eight kinds of reference samples tested, 1,8-cineole always showed strong attractableness to female B. tabaci at five concentration levels. Eugenol, limonene, linanlool and myrcene showed strong attractableness to female B. tabaci just at appropriate concentrations. However, both α-pinene and Cis-3-Hexen-l-of displayed repellency to B. tabaci at high concentrations, but had no effect at low concentrations. Dodecane had no distinct effect on B. tabaci at any concentrations. 4）Peper plants applied with tomato and cabbage volatiles analogues, respectively, could significantly attract B. tabaci adults. However, there was no significant difference in attractableness to female B. tabaci between tomato plants applied with pepper volatiles analogues and CK. The results suggest that volatile infochemicals from host plants play important roles in orientating behavior of Bemisia tabaci B-biotype.

Key words: Bemisia tabaci (Gennadius) B-biotype, host plant, volatile, host selection, behavioral responses