Attraction responses of ladybird beetle Hippodamia variegata (Goeze, 1777) (Coleoptera: Coccinellidae) to single and binary mixture of synthetic herbivore-induced plant volatiles in laboratory tests

GENÇER N. S., KUMRAL N. A., Seidi M., Pehlevan B.

TURKIYE ENTOMOLOJI DERGISI-TURKISH JOURNAL OF ENTOMOLOGY, vol.41, no.1, pp.17-26, 2017 (SCI-Expanded) identifier identifier


The chemoreception response of an aphidophagous coccinellid predators [Hippodamia variegate (Goeze, 1777) (Coleoptera: Coccinellidae)] to the odors from four different synthetic HIPVs [methyl salicylate (MeSA), (E)-2-hexenal (E(2)H), farnesene (F) and benzaldehyde (Be)] was tested using two different doses (0.001 and 1 g/L) of the HIPVs, both alone and in five binary combinations [MeSA+F, MeSA+E(2)H, MeSA+Be, E(2)H+F and Be+F]. Insect responses were evaluated using two-choice experiments with a Y-tube olfactometer in laboratory conditions. The low single dose of MeSA attracted significantly more adults of H. variegate (71%) towards tubes containing the volatile source compared with the control volatile containing pure n-hexane. Adults of H. variegate did not significantly prefer single forms of either Be, E(2)H or F compared with MeSA alone. Additionally, this study showed that binary blends of MeSA with Be or F had significantly more attractiveness for H. variegate adults than controls. Thus, the compounds, Be and F, used together with MeSA were observed to increase adult attraction. In the future, additional studies that monitor the preferences of field populations of these predators treated with the attractive HIPV combinations should be conducted to confirm these findings.