- 1Within 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.
- 2Some larvae developed to fecund adults on trees of two susceptible clones but all failed to develop on a third, resistant clone.
- 3Within susceptible clones, survival of larvae on individual trees was positively related to their degree of natural infestation.
- 4Larvae deriving from several separate trees differed significantly in their ability to survive when inoculated onto trees of susceptible clones.
- 5Five forest trees which acted as both donors of larvae and as hosts for artificial inoculation were each inoculated with larvae from all five trees.
- 6There was significant variation in survival of inoculated larvae both between the host trees and between sources of larvae on each host.
- 7Survival of larvae reinoculated onto their original host was significantly higher than that of larvae originating from other trees.
- 8Fecundity of adults on the forest trees was positively correlated with the probability of inoculated larvae surviving to the adult stage.