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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.

Accession: 005151556

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Related references

Mejnartowicz, L.E.; Szmidt, A., 1978: Investigations into the resistance of Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) populations to the Douglas fir woolly aphid (Gilletteella cooleyi Gill.). In 1976 and 1977, 59 populations were studied from a provenance trial established in 1968 using material from the North American 1966 IUFRO collection. There were significant differences between populations in the degree of infestation, those from...

Cantiani, M., 1968: The Douglas Fir woolly aphid (Gilletteella. Reports the first recorded infestations of G. cooleyi on Douglas Fir in Italy during 1967-68, when plantations and nurseries in the provinces of Pistoia, Bologna and Florence were attacked, and urges action to prevent the spread of the aphid and i...

Roversi, P.F.derico; Binazzi, A., 1996: Life cycle of the Douglas-fir woolly aphid Gilletteella coweni in central Italy. In Italy at present the Douglas-fir (Pseudotsuga menziesii) is colonized almost everywhere by the nearctic anholocyclic woolly aphid Gilletteella coweni (Galette) which was introduced into this country at the beginning of the 60s. Along with the e...

Roversi, P.F.; Nocentini, S., 1996: Impact of Douglas fir woolly aphid (Gilletteella coweni (Gillette)), Homoptera: Adelgidae, on host plant growth. Gilletteella coweni [Adelges cooleyi] was introduced into Italy in the 1960s, and is present mainly in hilly and montane areas along the Apennines. Attacks on Douglas fir (Pseudotsuga menziesii) can be severe in spring when the new generation deve...

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Goix, J., 1982: Gilletteella cooleyi pest of Douglas fir. Phytoma (335) 31-32

Muller, H., 1941: The Douglas Fir Woolly Aphis, Chermes cooleyi, and its Control. Chermes (Gilletteella) cooleyi, Gill., was introduced into Germany on nursery plants of Douglas fir from Scotland after the cold winter of 1928-29, and is now widely distributed there, though it was checked to some extent by the severe winter of 1...

D.Fluiter H.J., 1934: Observations in Holland on Chermes cooleyi, the Douglas Fir Woolly Aphis. Attention has been drawn to the spread of Chermes (Gilletteella) cooleyi, Gill., on Douglas fir in Holland . A list is given from the literature of the forms of this Aphid on the primary food-plants (Picea) and the secondary food-plant (Pseudotsug...

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