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Differences in susceptibility to matsucoccus feytaudi duc. homoptera margarodidae in cluster pine pinus pinaster ait. according to provenance

, : Differences in susceptibility to matsucoccus feytaudi duc. homoptera margarodidae in cluster pine pinus pinaster ait. according to provenance. Annales des Sciences Forestieres (Paris) 43(4): 459-474

Observations were made on the susceptibility of some provenances of cluster pine (Pinus pinaster AIT.) to infestation by Matsucoccus feytaudi DUC., in a comparative plantation set up in 1965 in the Maures-Hills (provence Southern France). Observations consisted of: - symptom-notations tree by tree, carried out from 1979 to 1984; - a search for an explanation of the observed differences, through, on the one hand, an evaluation of the insect population level (by trapping females and by counting second instar nymphae). On the other hand, in certain provenances only, through an examination of the character of the bark-tissues. Symptom-notations (table 1 and figure 1) point to important differences between the tested provenances regarding susceptibility to M. feytaudi. Under the conditions of the experiment, provenances from Cuenca (Spain) and from Tamjoute (Morocco) appeared symptom-free (or almost sympton-free, for the first one), other provenances: Mimizan (Landes, France), Leiria (Portugal), Marghese (Corsica, France), Genova (Italy) and Maures (France) were affected to different degrees, the two latter being very heavily affected. The results of trapping (table 2) and counting (see in text 3.22.) suggest that the immunity of the Cuenca and Tamjoute provenances seems to be related to the impossibility for Matsucoccus to multiply to important and injurious levels on these provenances. The observations, on the bark, and other previous observations (CARLE, 1973; RIOM, 1980) suggest different hypotheses for the mechanisms which might govern these differences. Mechanical factors, such as the structure of the bark which seems to constitute an obstacle for the settlement of the crawlers. They might be induced genetically and/or by environmental conditions (edaphic, climatic..). - Physiological and/or biochemical factors of the host plant, possibly genetically induced.

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