The ‘Cylindro’ complex of avocado root pathogens

Dann, Elizabeth K., Forsberg, Leif I., Cooke, Anthony W., Pegg, Ken G., Shivas, Roger G. and Tan, Yu Pei (2011). The ‘Cylindro’ complex of avocado root pathogens. In: 7th World Avocado Congress 2011 - Conference Proceedings. 7th World Avocado Congress, Cairns, QLD, Australia, (66-72). 5-9 September 2011.

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Name Description MIMEType Size Downloads
Author Dann, Elizabeth K.
Forsberg, Leif I.
Cooke, Anthony W.
Pegg, Ken G.
Shivas, Roger G.
Tan, Yu Pei
Title of paper The ‘Cylindro’ complex of avocado root pathogens
Conference name 7th World Avocado Congress
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 66
End page 72
Total pages 7
Collection year 2012
Language eng
Abstract/Summary Species of Cylindrocladium sp., Cylindrocarpon sp. are known to be pathogens of many agronomic and forestry crops worldwide, and in avocado one or both genera have been isolated from roots of either mature or nursery trees in South Africa, Israel, Spain, Chile and Australia since the early 1970s. More recently Cylindrocladium sp., Cylindrocarpon sp. and Cylindrocladiella sp. fungi have been isolated from diseased roots of young avocado trees which had infrequently declined or died soon after transplanting into orchards in Australia. Glasshouse studies with young seedlings were undertaken to establish pathogenicity of these fungi. Fourteen weeks after transplanting into potting mix containing infested media, plants from Cylindrocladium amended pots were significantly smaller, and roots were the least healthy based on area of black lesions on roots and mass, than from all other treatments. Interestingly, plants from Cylindrocladiella amended pots were significantly taller and roots were healthiest, although not significantly, than those from all other treatments. Plants from Cylindrocarpon amended pots had intermediate height and root health. The three fungi were re-isolated from roots of plants originally inoculated with the respective genera, completing Koch’s postulates. Morphological examination and DNA sequencing of ITS, β-tubulin and histone 3 gene regions were used to confirm isolate identity as Cylindrocladium parasiticum (teleomorph Calonectria ilicicola), Cylindrocarpon liriodendri (teleomorph Neonectria liriodendri), and an undescribed Cylindrocladiella sp.
Keyword Cylindrocladium parasiticum
Cylindrocarpon liriodendri
Nectria liriodendri
Cylindrocladiella
Black root rot
Q-Index Code EX
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Pests & Diseases: Quarantine / emerging diseases

Document type: Conference Paper
Collections: Non HERDC
Queensland Alliance for Agriculture and Food Innovation
 
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Created: Fri, 03 Feb 2012, 13:11:17 EST by Dr Elizabeth Dann on behalf of Qld Alliance for Agriculture and Food Innovation