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Sökning: LAR1:miun > Högberg Hans Erik > Lyytikäinen Saarenmaa P

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1.
  • Lyytikainen-Saarenmaa, Päivi, et al. (författare)
  • Monitoring the European pine sawfly with pheromone traps in maturing Scots pine stands
  • 2006
  • Ingår i: Agricultural and Forest Entomology. - 1461-9555. ; 8:1, s. 7-15
  • Tidskriftsartikel (refereegranskat)abstract
    • 1 During 1989-93, field studies were conducted in Finland to develop a method based on pheromone traps to monitor and forecast population levels of the European pine sawfly (Neodiprion sertifer Geoffr.) and tree defoliation. 2 Three traps per site were baited with 100 mu g of the N. sertifer sex pheromone, the acetate ester of (2S,3S,7S)-3,7-dimethyl-2-pentadecanol (diprionol), in maturing pine stands in southern and central Finland. In addition, three different dosages (1, 10 and 100 mu g) of the pheromone were tested in 1991-92. 3 The highest number of males was observed in traps baited with the highest dose. On average, there was a 10-fold increase in trap catch between lure doses. 4 Density of overwintering eggs was used to evaluate the effectiveness of pheromone traps in predicting sawfly populations. The proportion of healthy overwintering eggs was determined each year. A model based on the number of current shoots on sample trees, diameter at breast height and tree height was formulated to estimate eggs per hectare. 5 Linear regression analysis produced high coefficients of determination between number of males in traps and density of total eggs in the subsequent generation, when populations were at peak densities. The relationships were not significant for low population densities. The results indicate a risk of model-ate defoliation when the seasonal trap catch is 800-1000 males per trap or higher.
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3.
  • 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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