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Inhibitory effect of (-)alpha-pinene high releae rates on Ips typographus (L.) response to its aggregaton pheromone

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Olenici N., Duduman M.L., Olenici V.

Editorial: Analele ICAS, 50, p.203-212, 2007.


The aim of the research presented in this paper was to prove that the effect of (-)alphapinene
on the response of Ips typographus (L.) to its aggregation pheromone depends on the release
rates of both pheromone and monoterpene volatiles. Six treatments have been tested in four
experimental areas using six replicates for each treatment: V1 – pheromone + (-)alpha-pinen 200
mg/day, V2 – pheromone + (-)alpha-pinen 500 mg/day, V3 – pheromone + (-)alpha-pinen 2000
mg/day, V4 – pheromone, V5 – control (blank) and V6 – 1/3 pheromone dispenser with 1/3 of normal
release rate. In all experimental areas, most captures have been recorded at V4 (pheromone alone),
while alpha-pinene at cca. 200mg/day, 500 mg/day and 2000 mg/day caused the decrease of the
captures by 13.2-43.9%, 22-55.2% and 53.1-70.2% respectively. The traps baited with pheromone
dispensers which were conditioned to have a release rate equal to only 1/3 from the release rate of the
commercial dispensers, caught insects representing about 1/3 of those recorded at the traps with
normal dispensers. The results confirm the hypothesis that the response of Ips typographus beetles to
the combination of synthetic pheromone with (-)-alpha-pinene depends on the concentration of
volatile substances that are released around the source, respectively on the release rates of the
pheromone and monoterpene. They also demonstrate, that at high release rates of the pheromone (cca.
30 mg/day), (-)alpha-pinene released at a rate of 200-2000 mg/day has an inhibitory effect,
determining the decrease of the number of beetles that are caught in the pheromone traps.

Cuvinte cheie: revistã de silviculturã şi ştiinţele mediului // journal of forestry and envronmental sciences