California grape phylloxera more variable than expected
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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of California Agriculture and Natural Resources
1996-07-01
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| Series: | California Agriculture |
| Online Access: | http://calag.ucanr.edu/archive/?article=ca.v050n04p9 |
| Summary: | 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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| ISSN: | 0008-0845 2160-8091 |