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Authors: GHEORGHE ROMEO RETEVOI.
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.
