[Ecological and physiological investigations on disposition of ageol beech tree (Fagus sylvatica L.) for infestation by beech scale (Cryptococcus fagisuga Lind.) (Coccina, Pseudococcidae)]

animal population coccidae damage fagus sylvatica forest ecology homoptera host parasite relations insecte suceur insectos chupadores laubbaum metabolism metabolisme metabolismo metabolismus pest resistance phenolic compounds population animale resistencia a las plagas sucking insects symptome symptoms