Dry heat as a disinfestation treatment against genetically diverse strains of grape phylloxera
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[1] Shandong Agricultural University
Shandong Agricultural University
China
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[2] Agriculture Victoria
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- Localización: Australian journal of grape and wine research, ISSN 1322-7130, Vol. 24, Nº 3, 2018, págs. 301-304
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
Background and Aims Grape phylloxera, Daktulosphaira vitifoliae (Fitch), causes damage to ungrafted European grapevine, Vitis vinifera L. worldwide. In Australia, 83 phylloxera genetic strains exist in distinct zones and the primary management strategy is quarantine. While moving viticultural machinery, particularly harvesters from a phylloxera infested zone, dry heat treatment at 40 and 45°C for 75 and 120 min, respectively, is recommended.
Methods and Results First instars of six root‐feeding phylloxera, G1, G4, G7, G19, G20 and G30, were subjected to dry heat treatment at 22, 35, 40 and 45°C for 75, 90 and 120 min. For G20 and G30, first instars were subjected to 40°C for 135 min in a separate treatment. Across the six phylloxera genetic strains, no phylloxera survived treatment at 45°C for 75 min. First instars of G1, G4, G7, G19 phylloxera did not survive treatment at 40°C for 120 min. For G20 and G30 phylloxera, however, 100% mortality at 40°C was achieved only when time of treatment was increased to 135 min. The development of surviving phylloxera on excised V. vinifera cv. Chardonnay roots was influenced by the temperature of the dry heat treatment.
Conclusions Results validated the effectiveness of dry heat disinfestation protocol of 45°C for 75 min across diverse phylloxera genetic strains. The alternative protocol of 40°C for 120 min was not effective across all phylloxera strains and a duration of 135 min is recommended.
Significance of the Study This study highlights the relative sensitivity of genetically diverse phylloxera to heat treatment and duration of exposure.
