Crawford N. McNAIR, Gerhard GRIES*, Regine GRIES
Chemical Ecology Research Group, Centre for Pest Management Dept of
Biological Sciences, Simon Fraser Univ., Burnaby, B.C., V5A lS6, Canada
The cherry bark tortrix (CBT) ls a sehous pesl o1 ornamental cherry trees in southwestern British Columbia. Coupled gas chromatographic-electroantennographic detection (GC-EAD) and GC-mass spectrometry (MS) of female CBT pheromone gland extracts revealed 9 EAD-active components. 0f these, E9- and Z9-dodecenyl acetate (E9- and Z9-12:OAc) and Z7-decenyl acetate at a 40:6O:1 ratio were highly attractive to CBT males in field experiments. This 3-component blend or E9-12:OAc singly released from rope-type dispensers (2m) at tree trunks (tt), greatly reduced captures of CBT males in tt-traps baited with the 3-component blend, indicating potential for CBT mating disruption on individual trees. Porapak-Q capture of airborne cherry (host) and aspen (non-host) volatiles and analyses of these volatiles by GC-EAD and GC-MS revealed several compounds specific to cherry or aspen logs that elicited antennal responses both by male and female antennae. Addition of aspen volatiles to pheromone lures reduced attraction of CBT males, and when released from cherry lures may also adversely affect host-location of gravid females.
Current experiments explore the potential to release pheromones and non-host volatiles from the same dispenser to effectively disorient both mate-seeking males and host-seeking females.