Prevalence and survival, with emphasis on stubble burning, of Rhizoctonia spp., causal agents of sheath diseases of rice in Australia
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Aggregate sheath spot and sheath spot of rice were found in Australia in 2001. A disease survey revealed that both diseases are already well distributed within the Australian rice growing areas and that disease severity can be relatively important in some crops. Epidemiological studies showed that under Australian conditions, both Rhizoctonia oryzae and R. oryzae-sativae could overwinter as mycelium on straw debris, regardless of whether the straw is left on the ground or buried. Mycelium of R. oryzae-sativae present on rice straw was also found to be able to produce sclerotia, as a saprophyte, during the overwintering period. Results also strongly suggest that overwintered hyphal fragments present in the debris supplement the sclerotia as a primary source of inoculum, and also highlight the importance of straw management to reduce the inoculum of both pathogens in rice paddocks. The effect of burning stubble on the survival of laboratory-produced sclerotia of R. oryzae-sativae was investigated and it was shown that the vast majority of the sclerotia present on the soil surface survived stubble burning regardless of whether it was a ‘cold burn’ or a ‘hot burn’. A threshold temperature for sclerotial mortality was found to be between 93 and 12 PC.
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- Prevalence and survival, with emphasis on stubble burning, of Rhizoctonia spp., causal agents of sheath diseases of rice in Australia
Australasian Plant Pathology
Volume 34, Issue 2 , pp 135-142
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- rice diseases
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- Author Affiliations
- 1. Farrer Centre, Charles Sturt University, PO Box 588, 2678, Wagga Wagga, NSW, Australia
- 2. NSW Department of Primary Industries, Orange Agricultural Institute, Forest Road, 2800, Orange, NSW, Australia
- 3. CNSW Department of Primary Industries, Wagga Wagga Agricultural Institute, 2650, Wagga Wagga, NSW, Australia