Low reproducibility of attraction to host-plant volatile blends in the oriental fruit moth Grapholita molesta (Lepidoptera: Tortricidae) [Research data]
MetadataShow full item record
Studies in Australia and China identified host-plant volatile blends from peach and pear that capture relatively high numbers of Oriental fruit moths Grapholita molesta (Busck) in the field. These blends would be very valuable to indicate the effectiveness of mating disruption and to sample females and assess their mating status. Worldwide populations of G. molesta show significant genetic differentiation, so it is crucial to determine if the Australian and Chinese blends are attractive in other countries and relative to each other. The host-plant blends were tested simultaneously in Chile, a new location, together with a laboratory blend identified in Switzerland and a new "Total" blend mixing components of all three blends. Same solvent type, concentrations and dispensers as in the original studies, plus an additional concentration and solvent, were used. In total, only one female and 64 males were captured in traps baited with plant odors, whereas 1,847 males were captured in pheromone traps. Only the Swiss blend at the low dose in hexane captured significantly more males than the solvent traps, albeit in very low numbers (1.46 ± 1.46 mean ± SEM males/trap/week ). To determine if the host-plant blends increased the response of males to sex pheromone, and improve adult monitoring under mating disruption, we compared captures in traps baited with sex pheromone alone with captures in traps baited with sex pheromone and host-plant blends. The host-plant blends alone did not capture any adults, however they decreased captures of the sex pheromone, and the effect was dose-dependent for the Chinese and Total blends. A laboratory wind tunnel test confirmed the lack of response of G. molesta males to the Australian, Chinese and Swiss plant blends. However, in contrast to the field test, in the laboratory males responded sooner and in higher numbers to mixtures of sex pheromone and host-plant blends than to sex pheromone alone.
Dades primàries associades a un article pendent d'avaluació.
The following license files are associated with this item: