TAILIEUCHUNG - Báo cáo khoa học: " spread of Rhizophagus grandis Gyll (Coleoptera: Rhizophagidae) 6 years after release in the Forêt domaniale du Mézenc (France)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:" spread of Rhizophagus grandis Gyll (Coleoptera: Rhizophagidae) 6 years after release in the Forêt domaniale du Mézenc (France). | Ann Sci For 1995 52 243-250 Elsevier INRA 243 Original article Establishment and spread of Rhizophagus grandis Gyll Coleoptera Rhizophagidae 6 years after release in the Foret domaniale du Mezenc France A van Averbeke JC Gregoire Laboratoire de biologie animale et cellulaire CP 160 12 université libre de Bruxelles 50 av FD-Roosevelt B-1050 Brussels Belgium Received 11 March 1994 accepted 9 August 1994 Summary Sampling was carried out in August 1993 in a Norway spruce stand Foret domaniale du Mezenc Haute-Loire France heavily infested by the bark beetle Dendroctonus micans and where the predatory beetle Rhizophagus grandis had been released in 1987. Three circular plots 20 m in diameter were marked out in the vicinity of the release area and all trees within were examined. All D micans brood chambers below 2 m were opened and their contents analysed. Three similar plots were created 800 m or so away from the release area. In addition a number of brood chambers were sampled at the release area s limit and at distances of about 800-900 m and 1 090 m. There was a significant inverse relationship between local tree density and proportion of attacked trees r2 p . However there was a significant direct relationship between local tree density and absolute numbers of attacked trees r2 p . Adults and lan ae of the predator were found along the whole transect. Only prey brood chambers containing 5th instar larvae or older stages were colonised by R grandis. The R grandis D micans ratio counting all individuals in each brood chamber significantly decreased as distance increased r2 p . These findings suggest an effective but slow spread in predators released from a limited spot in a densely attacked stand. They fit well with earlier information from other release sites in the Massif Central. Rhizophagus grandis Dendroctonus micans I biological control dispersal I Scolytidae I Rhizophagidae Resume Établissement et dispersion de Rhizophagus grandis .

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