TAILIEUCHUNG - Báo cáo lâm nghiệp: "Etude quantitative de populations de Phyllocnistis suffusella Z. (Lepid. Lithocolletidae) en Belgique"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Etude quantitative de populations de Phyllocnistis suffusella Z. (Lepid. Lithocolletidae) en Belgique. | Ann. Sci. For. 1988. 45 3 255-264 Etude quantitative de populations de Phyllocnistis suffusella z. Lepid. Lithocolletidae en Belgique L. NEF Centre de Recherches pour la Lutte intégrée contre les Insectes forestiers Université Catholique de Louvain-AGROlEFOR . Place Croix du Sud 2 . 4 B-1348 Louvain-la-Neuve Summary Quantitative study of populations of Phyllocnistis suffusella Lepid. Lithocolletidae in Belgium This paper concerns the absolute and the relative frequencies of Ph. suffusella the most abundant leaf miner of the poplar in Belgium and probably in . For this work we retained the results of 7 years in 7 populetums and on 12 clones belonging to 3 poplar groups the trees arc between 2 and 7 year old and 5 to 15 m high. The mean value is attacked leaves per meter of twig tabl. 2 this value shows moderate variations in the various populetums. ph. suffusella is a common and regular insect on poplar trees its population appears to be quantitatively regulated by accurate mechanisms. The population densities vary considerably and significantly according to station and to genetic lactors. Conversely time and thus climate or prey-predator relationships has only a moderate and not significant effect on those densities. The extreme observations pooling the effects of station year and clone were larva m for the clone Unal at Borgloon in 1978 and 1 m for the Primo at Rotem in 1981. On the average 25 p. 100 of the poplar leaves arc attacked the maximum observed attaining 71 p. 100 Ph suffusella is therefore capable of influencing markedly the poplar trees and their growth. The above mentioned mean value differs little but significantly from clone to clone the extreme values are p. 100 for Robusta and p. 100 for Beaupre. Key words Phyllocnistis suffusella poplar. Populus leaf miner population density. Resume Le but du travail est d exprimer les frequences absolues et relatives de Phyllocnistis suffusella z. la mineuse la plus abondante .

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