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Ecological estimation of coleopterous predators caught in bark beetle pheromone traps



Ecological estimation of coleopterous predators caught in bark beetle pheromone traps



Anzeiger fuer Schaedlingskunde Pflanzenschutz Umweltschutz 66(4): 68-72



Abundance and distribution of the predator Nemosoma elongatum (Col., Ostom.) were investigated with bark beetle pheromone traps in 8 conifer- and deciduous-stands of different age in 1991/92. Several pheromones were used, of which Chalcoprax acts as an intensive kairomone to N. elongatum. Results show that N. elongatum can be found in the entire research area with locally high numbers. The proportion of predators being caught with Chalcoprax varies considerably in 1991 and 1992 with a local maximum of 20%. Especially in time of increase in spring the growth of predator-population is therefore affected. The ecological consequences of reducing N. elongatum-population by pheromone traps are discussed. It is stressed that predators being caught with Chalcoprax would partially have fed upon more bark beetles under natural circumstances than were caught in the traps.

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Accession: 002351210

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