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Silva Fennica 1926-1997
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Articles containing the keyword 'repellent'.

Category: Research note

article id 517, category Research note
Matti Huotari, Mareena Jaskari, Erkki Annila, Vilho Lantto. (2003). Responses of olfactory receptor neurons of the large pine weevil to a possible deterrent Neutroil® and two other chemicals. Silva Fennica vol. 37 no. 1 article id 517. https://doi.org/10.14214/sf.517
Electrophysiological responses of olfactory receptor neurons were measured from the antennal sensilla of large pine weevils (Hylobius abietis L.) at 1 s exposure to Neutroil®-hexane mixture odour as a possible deterrent chemical and, for comparison, to α-pinene, α-pinene-ethanol mixture, and ethanol odours, respectively. Neutroil® is a commercial chemical pulp-mill product which has been studied earlier as a deterrent for large pine weevils with preliminary feed tests. In addition, ethanol, hexane and clean carrier air responses were measured. Odour pulses and clean air, as a zero reference value, were directed at a fixed insect antenna in order to induce olfactory responses. Simultaneous olfactory responses, i.e. Hylobius electroantennograms (EAG) and action potential responses, were recorded and these responses of Hylobius olfactory receptor neurons (ORN), such as action potential rates, silent periods and EAG responses, were analyzed for all simultaneous recordings. The exposures to α-pinene, α-pinene-ethanol mixture, pure ethanol and hexane caused an increase of the action potential rate (up to 70 pulses per second) in the ORNs sensitive to these odours, while the Neutroil®-hexane mixture exposures caused either silent periods with a duration between 0.6 and 1.1 s for 1 s exposure pulses or they had no response at all in the ORNs sensitive to the other odours. Thus, the possible deterrence may be caused by inhibition of some pinene-alcohol ORNs.
  • Huotari, University of Oulu, P.O. Box 4500, FIN-90014 University of Oulu, Finland ORCID ID:E-mail: matti.huotari@oulu.fi (email)
  • Jaskari, University of Oulu, P.O. Box 4500, FIN-90014 University of Oulu, Finland ORCID ID:E-mail:
  • Annila, Finnish Forest Research Institute, P.O. Box 18, FIN-01301 Vantaa, Finland ORCID ID:E-mail:
  • Lantto, University of Oulu, P.O. Box 4500, FIN-90014 University of Oulu, Finland ORCID ID:E-mail:

Category: Article

article id 5486, category Article
Kari Löyttyniemi, Risto Heikkilä, Seppo Repo. (1992). Pine tar in preventing moose browsing. Silva Fennica vol. 26 no. 3 article id 5486. https://doi.org/10.14214/sf.a15647

The efficacy of pine tar as a moose (Alces alces L.) contact repellent was tested in young Scots pine (Pinus sylvestris L.) stands suffering from moose damage in Southern Finland during the winter 1981–82. Application of tar to shoots by spraying protected the trees satisfactorily throughout the winter.

The PDF includes an abstract in Finnish.

  • Löyttyniemi, ORCID ID:E-mail:
  • Heikkilä, ORCID ID:E-mail:
  • Repo, ORCID ID:E-mail:

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