Agricultural and Forest Entomology (2003) 5, 87-96

Marius Gilbert and Jean-Claude Grégoire (2003)
Site condition and predation influence a bark beetle's success: a spatially realistic approach
Agricultural and Forest Entomology 5 (2), 87-96
Abstract: 1 Spatial pattern in abundance of Dendroctonus micans was studied in a 600-ha spruce stand in the Massif Central (Lozère, France). The proportion of trees attacked was measured in 38 plots and these data were used to estimate spatial pattern of attack density in the stand and to identify a transect of decreasing attack density (80% to 30%) over less than 1000 m.
2 Spatial variation in attack density was analysed in relation to (i) data on site and stand characteristics (altitude, slope, tree density, tree average height, yield class and average age) collected from 63 points in the stand and (ii) the releases of the predator Rhizophagus grandis (localization and number of beetles released).
3 The proportion of attacked trees was analysed using geostatistics and showed a strong spatial structure reflecting the spatial scale of interaction of D. micans with its environment. The spatial structure was modelled in order to estimate the spatial distribution of attack density at unsampled locations.
4 A linear model relating interpolated attack density to the number of predators released 6-10 years before the survey in a 300-m radius and to the average slope over a 250-m radius explained 67% of the observed variability. Spatial autocorrelation was taken into account in a spatial regression model.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Marius Gilbert, Jean-Claude Grégoire

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
population dynamics/ epidemiology
Research topic(s) for beneficials or antagonists:
population dynamics/epizootiology
environment/habitat manipulation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Dendroctonus micans	Spruce (Picea)	France
Rhizophagus grandis (predator)	Dendroctonus micans	Spruce (Picea)	France