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Sensitivity of pruned maritime pine (Pinus pinaster Ait) to Dioryctria sylvestrella Ratz. (Lep., Pyralidae) in relation to tree vigour and date of pruning

1996; Wiley; Volume: 120; Issue: 1-5 Linguagem: Inglês

10.1111/j.1439-0418.1996.tb01583.x

1439-0418

Hervé Jactel, Pierre Menassieu, Gloria Raise, Christian Burban,

Forest ecology and management

Abstract: Infestation rate of Dioryctria sylvestrella was studied for the following three categories of maritime pine: (i) those trees that had been selected for pruning and pruned; (ii) those trees that had been selected for pruning but not pruned; and those trees that had neither been selected nor pruned. In comparing 10 diameter classes and 4 dates of pruning, the percentage of trees attacked was recorded. In both pruned and unpruned trees, the level of attack increased with tree diameter, according to a logistic curve. Pruned trees were significantly more infested than unpruned trees. Selection for pruning did not result in a significant higher rate of attack in unpruned trees. The percentage of pruned trees attacked did not differ significantly according to the date of pruning. The interaction between tree diameter and tree type did not induce any significant difference in infestation rate. The model of tree infestation, involving primary attraction for the female moth, was strengthened. Volatile attractants, originating in the constitutive oleoresin, might allow the selection of susceptible trees. Tree pruning, creating bark wounds, and tree vigour, increasing bark cracking, could similarly, though independently, increase constitutive resin flow, thus enhancing tree attractiveness.