AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA AMBIENTUM - Ediţia nr.1-2 din 2010 | |||||||
Articol: |
THE DYNAMIC MOVEMENT OF THE POPULATION OF PHYLLAPHIS FAGI IN THE FORESTS OF BEECH FROM THE UPPER BASIN OF THE DOAMNEI RIVER. Autori: GHEORGHE ROMEO RETEVOI. |
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Rezumat: Phyllaphis fagi is an aphid, frequently encountered in the beech forests in our country. During a whole year it presents a succession of asexual and sexual generations. The attack is strong in spring when on the back of the beech leaves whitish colonies are formed. The collecting of the field data allowed the determination of the type of distribution, the determination through calculation of the number of the testing units, the density, the numerical evolution of the population in the tested surfaces, the coefficient of multiplication, the frequency of the attacked leaves compared to the number of individuals on each leaf, the accomplishment of a correlation between the climatic factors and the dynamic movement of the population. Key words: The Doamnei River, pest insects, beech, Phyllaphis fagi. |
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