California grape phylloxera more variable than expected

Autor: Jeffrey Granett, Andrew Walker, John De Benedictis, Genine Fong, Hong Lin, Ed Weber
Jazyk: angličtina
Rok vydání: 1996
Předmět:
Zdroj: California Agriculture, Vol 50, Iss 4, Pp 9-13 (1996)
Druh dokumentu: article
ISSN: 0008-0845
2160-8091
DOI: 10.3733/ca.v050n04p9
Popis: Many strains of grape phylloxera now have been identified in California vineyards. This variability may be the result of multiple introductions of this pest or of evolution of new strains on susceptible or weakly resistant rootstocks. Thus own-rooted vines, weakly resistant rootstocks and those with V. vinifera parentage should not be used in phylloxerated areas. In addition, because of the observed variability, quarantines are ineffective in preventing the occurrence of biotype B phylloxera, as it appears to evolve independently in different areas.
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