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Sökning: LAR1:lu > Mittuniversitetet > Övrigt vetenskapligt > Hedenström E

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1.
  • Anderbrant, Olle, et al. (författare)
  • Pheromone mating disruption of the pine sawfly Neodiprion sertifer:
  • 2002
  • Ingår i: IOBC/WPRS bulletin. - Monfavet. - 1027-3115. ; 25:9, s. 111-116
  • Tidskriftsartikel (övrigt vetenskapligt)abstract
    • Few attempts to control forest insects by means of pheromone mating disruption have been reported. The first such experiments with the European pine sawfly, Neodiprion sertifer (Hymenoptera: Diprionidae), resulted in nearly complete trap catch reduction, but no effects on population density or sex ratio were noted. Unmated females lay eggs, which develop into males only. Therefore, if mating disruption would be successful, a more male-biased sex ratio is expected the next generation. One possible explanation for the early results is that mated females disperse into the treated area, and thus obscure the effects of the treatment. In order to reduce the effect of such immigrating females, the treated area was increased in the experiment described here from the earlier used 0.5 – 4 ha to 25 ha. The acetate of erythro-3,7-dimethyl-2- pentadecanol was used for disruption and released from dispensers every 10 m. The influence on male orientation was monitored by pheromone traps, baited with the acetate of (2S,3S,7S)-3,7- dimethyl-2-pentadeanol and placed at 100 m interval along two perpendicular, 1500 m lines intersecting the treated area. The trap catch reduction was near 100% during the first month, but then declined to around 90% during the second month. Mating frequencies were checked by comparing the sex ratio of the next generation from within and outside the treatment area. No effect of the treatment on the sex ratio was detected, and the frequency of mated females could be assumed to be independent of treatment. Alternative hypotheses to explain the failure of pheromone mating disruption in N. sertifer are discussed.
2.
  • Lyytikäinen-Saarenmaa, P, et al. (författare)
  • Predicting pine sawfly population densities and subsequent defoliation with pheromone traps
  • 2001
  • Ingår i: INTEGRATED MANAGEMENT AND DYNAMICS OF FOREST DEFOILIATING INSECTS, PROCEEDINGS. - US DEPT AGR. ; 277, s. 108-116
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • Field in Finland to develop a monitoring and prediction trials were conducted from 1989 to 1993 method using pheromone traps for European pine sawfly (Neadiprion sertifer Geoffr.) population densities and needle defoliation. Three traps per site were baited with 100 mug of(2S,3S,7S) - 3,7 - dimethyl - 2 - pentadecyl acetate (diprionyl) at sites representing advanced pine stands. The number of overwintering eggs per sample branch was used to evaluate the effectiveness of using pheromone traps to estimate sawfly populations. The relationships between the number of males in traps, the number of eggs per branch in the subsequent generation, and the number of needle-year classes after the subsequent growing season were highly correlated. The risk threshold for moderate to heavy defoliation was around 1,000 males/trap. Our results suggest that after some minor improvements, a pheromone-based monitoring system for the European pine sawfly would provide an effective tool for integrated pest management programs and successful forest management in coniferous pine-dominated forests.
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Anderbrant, Olle (2)
Varama, M (1)
Högberg, H E (1)
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