Field assessment of avocado rootstock selections for resistance to Phytophthora root rot

Smith, L. A., Dann, E. K., Pegg, K. G. and Whiley, A. W. (2011). Field assessment of avocado rootstock selections for resistance to Phytophthora root rot. In: , 7th World Avocado Congress 2011 - Conference Proceedings. 7th World Avocado Congress 2011, Cairns, QLD, Australia, (222-225). 5-9 September 2011.

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Author Smith, L. A.
Dann, E. K.
Pegg, K. G.
Whiley, A. W.
Title of paper Field assessment of avocado rootstock selections for resistance to Phytophthora root rot
Conference name 7th World Avocado Congress 2011
Conference location Cairns, QLD, Australia
Conference dates 5-9 September 2011
Proceedings title 7th World Avocado Congress 2011 - Conference Proceedings
Publisher World Avocado Congress
Publication Year 2011
Sub-type Fully published paper
Start page 222
End page 225
Total pages 4
Collection year 2012
Language eng
Formatted Abstract/Summary The use of Phytophthora cinnamomi (Pc) resistant rootstocks has become an increasingly useful tool in the integrated management of Phytophthora root rot (PRR) in avocado orchards. Field trials have been conducted at three locations in the eastern production areas of Australia since December 2005 in replant land with a history of PRR to assess the performance of rootstock selections. Seedling and clonally-propagated rootstocks were included from a range of currently used rootstocks as well as material selected from trees which had survived for many years despite high Pc pressure, ie. "escape" trees. All rootstocks were grafted with "Hass" scions. New selections "SHSR-02", SHSR-04", ungrafted "Hass" (rooted cuttings from clonal propagation) and the commercially available rootstock "DusaTM" were found to be consistently better survivors and healthier over time compared to other rootstocks including "Reed", "Velvick" and "A10". Superior health was often associated with increased tree height and trunk girth. "Reed" was consistently highly susceptible, and had the lowest yields at a site with relatively low PRR pressure where tree health of "Reed" only was compromised by Pc. Soil baiting and root isolations confirmed the presence and infectivity of Pc in soils at the field sites. The trials clearly demonstrated the advantage of using rootstocks able to withstand high Pc pressure when establishing new avocado orchards, particularly in replant land. 
Keyword Phytophthora cinnamomi
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Pests & Diseases: Phytophthora

Document type: Conference Paper
Collections: HERDC Pre-Audit
Queensland Alliance for Agriculture and Food Innovation
 
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Created: Fri, 03 Feb 2012, 13:18:29 EST by Dr Elizabeth Dann on behalf of Qld Alliance for Agriculture and Food Innovation