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Differences in the resistance of douglas fir provenances to the woolly aphid gilletteella cooleyi

, : Differences in the resistance of douglas fir provenances to the woolly aphid gilletteella cooleyi. Silvae Genetica 36(2): 76-79

Four-year old plants of 165 Douglas fir provenances (Pseudotsuga menziesii) from the IUFRO seed collection 1966/69 have been evaluated for the resistance against the woolly aphid Gilletteella cooleyi. Large differences were found which correspond with the geographical groups within the species Pseudotsuga menziesii: northern coastal provenances (green form of Douglas fir) were infested severely, southern coastal provenances from southern Oregon and California [USA], were less attacked. Low attack was observed also in northern interior provenances (grey form of Douglas fir). Almost resistant were southern interior provenances (blue form of Douglas fir). The mean values of woolly aphid attack were strngly correlated with the percentage of infested trees within a provenance. The results correspond very well with the differentiation of terpene types of Douglas fir by other authors.

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