Incidence du feuillage de differentes especes de pin sur le developpement et la ponte de Diprion pini L. (Hym., Diproinidae). 2. Incidence sur la ponte et variabilite interspecifique de certains composes secondaires actifs.
1994
Auger M.A. | Geri C. | Allais J.P.
This paper is concerned with an experiment dealing with the oviposition of female sawfly (Diprion pini L.) which was made to lay eggs on the twigs of ten different species or sub-species of pine. These, in turn, had previously been tested for their foliage edibility by the sawfly. Subsequent reference is made to a number of analyses of the chemical composition of the respective needles of the ten species. These analyses refer solely to diterpene resin acids and a number of polyphenols belonging to the flavonoid group which were suspected of being injurious to the sawfly. Black pine needles provide a suitable environment for the oviposition of the sawfly, and the female sawfly appears to lay even more eggs on this foliage than observed in Scots pine. Sawfly performance attained with Pinus radiata, Pinus banksiana, and Pinus contorta were also relatively consistant with results obtained on Scots pine, confirming that sawfly may constitute a real danger for species of North American origin. On the other hand Pinus pinaster and Pinus strobus foliage proved highly unfavourable to egg laying. Low egg-laying performance was also observed on Pinus uncinata needles. The analyses reveal significant variations in the chemical composition of pine-host needles with respect to species, while no apparant correlation is evident with regards to sawfly development. Nevertheless, Scots pine, which appears to provide the best food, contains fewer resin acids (abietanes and primaranes) than other species. Scots pine foliage is the richest in more polar compounds, while being poor in abietic acid content. The latter is more abundant in P. pinaster, which contains mainly primarane acid.
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