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Biological suppressiveness against sugarcane poor root syndrome in Queensland soils

Biological suppressiveness against sugarcane poor root syndrome in Queensland soils Poor root syndrome (PRS) is a recently recognised disease of sugarcane causing serious yield reductions and harvesting problems in high rainfall regions of North Queensland. The primary pathogens are Pythium graminicola causing destruction of fine roots and an unnamed Oomycete causing flaccid rot of primary roots. Physical and chemical soil treatments have not provided economic control. So a search was undertaken for potential biocontrol agents. Apparent natural decline in PRS-related stool tipping has been reported from several fields. Soils from two of these fields showed biological suppression of flaccid root rot in a glasshouse pot test. Although many bacterial isolates from the sugarcane rhizosphere in these soils showed antibiosis against one or both PRS pathogens in vitro, none markedly reduced PRS severity when tested individually in pot trials. Five of 760 tested sugarcane rhizosphere microbes from various soils substantially reduced PRS severity or enhanced early plant growth in repeated pot tests, but none has so far approached economic control levels under field conditions. The results emphasise the practical uncertainty of a search for an economic biocontrol. Suppressiveness due to a combination of many microbes may occur naturally, but would be difficult to exploit for economic control of PRS. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Australasian Plant Pathology Springer Journals

Biological suppressiveness against sugarcane poor root syndrome in Queensland soils

Birch, R.
Australasian Plant Pathology , Volume 15 (3) – Feb 28, 2011
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References (12)

Publisher
Springer Journals
Copyright
Copyright
Subject
Life Sciences; Plant Pathology; Plant Sciences; Agriculture; Entomology; Ecology
ISSN
0815-3191
eISSN
1448-6032
DOI
10.1071/APP9860051
Publisher site
See Article on Publisher Site

Abstract

Poor root syndrome (PRS) is a recently recognised disease of sugarcane causing serious yield reductions and harvesting problems in high rainfall regions of North Queensland. The primary pathogens are Pythium graminicola causing destruction of fine roots and an unnamed Oomycete causing flaccid rot of primary roots. Physical and chemical soil treatments have not provided economic control. So a search was undertaken for potential biocontrol agents. Apparent natural decline in PRS-related stool tipping has been reported from several fields. Soils from two of these fields showed biological suppression of flaccid root rot in a glasshouse pot test. Although many bacterial isolates from the sugarcane rhizosphere in these soils showed antibiosis against one or both PRS pathogens in vitro, none markedly reduced PRS severity when tested individually in pot trials. Five of 760 tested sugarcane rhizosphere microbes from various soils substantially reduced PRS severity or enhanced early plant growth in repeated pot tests, but none has so far approached economic control levels under field conditions. The results emphasise the practical uncertainty of a search for an economic biocontrol. Suppressiveness due to a combination of many microbes may occur naturally, but would be difficult to exploit for economic control of PRS.

Journal

Australasian Plant Pathology – Springer Journals

Published: Feb 28, 2011

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