Australasian Plant Pathology

, Volume 34, Issue 2, pp 135–142

Prevalence and survival, with emphasis on stubble burning, of Rhizoctonia spp., causal agents of sheath diseases of rice in Australia

  • V. M. Lanoiselet
  • E. J. Cottier
  • G. J. Ash
  • T. L. Hind-Lanoiselef
  • G. M. Murray
  • J. D. I. Harper
Article

DOI: 10.1071/AP05010

Cite this article as:
Lanoiselet, V.M., Cottier, E.J., Ash, G.J. et al. Australasian Plant Pathology (2005) 34: 135. doi:10.1071/AP05010

Abstract

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.

Additional keyword

epidemiologyrice diseasescontrol methodfiresclerotia

Copyright information

© Australasian Plant Pathology Society 2005

Authors and Affiliations

  • V. M. Lanoiselet
    • 1
  • E. J. Cottier
    • 2
  • G. J. Ash
    • 1
  • T. L. Hind-Lanoiselef
    • 3
  • G. M. Murray
    • 3
  • J. D. I. Harper
    • 1
  1. 1.Farrer CentreCharles Sturt UniversityWagga WaggaAustralia
  2. 2.NSW Department of Primary IndustriesOrange Agricultural InstituteOrangeAustralia
  3. 3.CNSW Department of Primary IndustriesWagga Wagga Agricultural InstituteWagga WaggaAustralia