Influence de la pollution atmospherique sur les populations d'aphides du pin sylvestre en foret de roumare (seine-maritime)

Abstract

In young Scots pine stands of the Roumare forest, increases in aphid populations, as shown by the tree-beating method, are confirmed by a more convenient visual census. Some species of aphids ( Cinara pini L., Cinara pinea Mordv. and the dominant species Protolachnus agilis Kalt.) are significantly more abundant in polluted areas; the opposite trend is observed for other species ( Schizolachnus tomentosus Deg. and Pineus pini L.). However, aphid population dynamics depend mainly upon other factors (climate, soil) and aphids could play only a minor part as biological indicators of atmospheric pollution.