Wenda-Piesik A., Piesik D., Krasińska A. (2018): Response of mated insects of both sexes of granary weevil to blends of volatiles -short communication. Plant Protect. Sci., We report the behavioural responses of mated granary weevils to blends of cereal volatiles. Four doses were applied on filter paper (1, 10, 100, and 1000 ng/min in 50 µl of hexane applied on filter paper). A Y-tube experiment revealed that mated females of Sitophilus granarius were attracted to blend 1, 4, and 5 at concentrations of 1000, 100, 1, and 10 ng/min, respectively. Mated males were attracted only to blend 5 at a concentration of 10 ng/minute. Yet, the mated weevil females and males were repelled by the highest concentration (1000 ng/min) for all tested blends. Moreover, both mated sexes were repelled by 100 ng/min in blends 2, 3, 5, and 6. Additionally, females were repelled by 10 ng/min in blend 6. We claim that the blend of volatiles and their concentration can induce the insect behaviour.
Keywords: cereal insects; cereal volatiles; attractants; repellents
Abbreviation list of chemical compoundsVOCs = volatile organic compounds; blend 1 -aliphatic alcohols (1-butanol = 1-BUT, 1-pentanol = 1-PEN, 1-hexanol = 1-HEX, 3-methyl-1-butanol = 3-MET); blend 2 -aliphatic aldehydes (butanal = BUT, pentanal = PEN, hexanal = HEX, heptanal = HEP, (e)-2-hexenal = (e)-2-HEX, (e,e)-2,4-peptadienal = (e,e)-2,4-HEP, (e,e)-2,4-nonadienal = (e,e)-2,4-NON, (e,e)-2,4-decadienal = (e,e)-2,4-DEC); blend 3 -aliphatic ketones (2-pentanone = 2-PEN, 2-hexanone = 2-HEX, 2-heptanone = 2-HEP, 2,3-butanedione = 2,3-BUT); blend 4 -aromatics (3-methoxy-2-methyl-4-pyrone (maltol) = MAL, 132 furfural = FUR, phenylacetaldehyde = PHE, 3-methoxy-4-hydroxy-benzaldehyde (vanillin) = VAN); blend 5 -aliphatic alcohols, aliphatic aldehydes, aliphatic ketones, aromatics; blend 6 -plant VOCs ([(Z)-ocimene = (Z)-OCI, linalool = LIN, benzyl acetate = BAC, methyl salicylate = MAT, β-caryophyllene = β-CAR, (e)-β-farnesene = (e)-β-FAR)]