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Intraspecific variation in beech scale populations and in susceptibility of their host Fagus sylvatica
Author(s) -
WAINHOUSE D.,
HOWELL R. S.
Publication year - 1983
Publication title -
ecological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.865
H-Index - 81
eISSN - 1365-2311
pISSN - 0307-6946
DOI - 10.1111/j.1365-2311.1983.tb00515.x
Subject(s) - biology , fagus sylvatica , beech , larva , intraspecific competition , host (biology) , infestation , inoculation , botany , zoology , ecology , horticulture
.1 Within a seed orchard in southern England, beech trees (Fagus sylvatica L.) belonging to three clones were artificially infested by introducing beech scale larvae (Cryptococcus fagisuga Lind. Homoptera: Coccidae) into small cages attached to the bark. 2 Some larvae developed to fecund adults on trees of two susceptible clones but all failed to develop on a third, resistant clone. 3 Within susceptible clones, survival of larvae on individual trees was positively related to their degree of natural infestation. 4 Larvae deriving from several separate trees differed significantly in their ability to survive when inoculated onto trees of susceptible clones. 5 Five forest trees which acted as both donors of larvae and as hosts for artificial inoculation were each inoculated with larvae from all five trees. 6 There was significant variation in survival of inoculated larvae both between the host trees and between sources of larvae on each host. 7 Survival of larvae reinoculated onto their original host was significantly higher than that of larvae originating from other trees. 8 Fecundity of adults on the forest trees was positively correlated with the probability of inoculated larvae surviving to the adult stage.