Interspecific pheromone cross-attraction among soybean bugs (Heteroptera): does Piezodorus hybneri (Pentatomidae) utilize the pheromone of Riptortus clavatus (Alydidae) as a kairomone?
The chemical and ecological function of cross-attraction of Piezodorus hybneri (Pentatomidae) to the Riptortus clavatus (Alydidae) pheromone (a mixture of three components) was studied. In a field attraction test using traps with synthetic pheromone components, P. hybneri was attracted to (E)-2-hexenyl (E)-2-hexenoate, a component of the R. clavatus pheromone. Other components had neither an additive nor a synergistic effect on the attraction of P. hybneri. Neither (E)-2-hexenyl (E)-2-hexenoate nor other components of the R. clavatus pheromone were detected in volatiles or whole-body extracts of P. hybneri adults by gas chromatographic analysis. In addition, (E)-2-hexenyl (E)-2-hexenoate could not be found in volatiles of soybean plants. Therefore, it appears that P. hybneri responds to a component of the R. clavatus pheromone that is not emitted by P. hybneri itself. We discuss this interspecific pheromone cross-attraction of the soybean bug and hypothesize that P. hybneri utilizes the pheromone of its competitor as a kairomone for host location.
Endo
Nobuyuki
N
National Agricultural Research Center for Kyushu Okinawa Region, Koshi, Kumamoto, Japan. enobu@affrc.go.jp
Wada
Takashi
T
Nishiba
Yoichi
Y
Sasaki
Rikiya
R
D000818:Animals; D002208:Caproates / Q000378:metabolism / Q000494:pharmacology; D004463:Ecology; D020062:Heteroptera / Q000502:physiology*; D010675:Pheromones / Q000737:chemistry / Q000502:physiology*; D013025:Glycine max / Q000469:parasitology; D013045:Species Specificity; D014020:Tissue Extracts / Q000737:chemistry
C515405:2-hexenyl 2-hexenoate; D002208:Caproates; D010675:Pheromones; D014020:Tissue Extracts