UNSPECIFIED (2005) Effect of combined treatment of pasteurisation and Coniothyrium minitans on sclerotia of Sclerotinia sclerotiorum in soil. EUROPEAN JOURNAL OF PLANT PATHOLOGY, 113 (2). pp. 197-209. doi:10.1007/s10658-005-2331-4 ISSN 0929-1873.

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Abstract

Integrated control of soil-borne plant pathogens such as Sclerotinia sclerotiorum is becoming more important as the soil fumigant methyl bromide is being phased out of use. Two alternative methods of control that have been found to reduce viability of sclerotia are steam sterilisation (pasteurisation) of soil or the application of the mycoparasite Coniothyrium minitans. This work investigated the possibility of integrating these two control measures. Soil was pasteurised in an autoclave, using a temperature of 80 degrees C for 3 min to simulate the possible temperatures reached by soil steaming machines for field use. Coniothyrium minitans was subsequently applied to the pasteurised soil to assess the effects of the combination of control measures in reducing sclerotial viability of S. sclerotiorum. Similar results were found in two soil types. Either method used individually was effective in decreasing the number of viable sclerotia, but no further reduction in sclerotial viability was seen when the two methods were combined. Coniothyrium minitans was found to colonise pasteurised sclerotia significantly quicker than untreated sclerotia, and it was seen that there was an increase in number of C. minitans in pasteurised soil in the presence of sclerotia. Experiments were also conducted to investigate the effect of application timing of the biocontrol agent to soil following pasteurisation, in relation to sclerotial infection. Here, two different isolates of S. sclerotiorum were used, with similar results. Application of C. minitans to soil immediately following pasteurisation resulted in sclerotial infection by the mycoparasite, but application 7 days or more after soil pasteurisation resulted in low recovery of the biocontrol agent from sclerotia, possibly due to the mycoparasite being masked by the presence of other fungi which colonised the sclerotia first.

Item Type:	Journal Article
Subjects:	S Agriculture S Agriculture > SB Plant culture
Journal or Publication Title:	EUROPEAN JOURNAL OF PLANT PATHOLOGY
Publisher:	SPRINGER
ISSN:	0929-1873
Official Date:	October 2005
Dates:	Date Event October 2005 UNSPECIFIED
Volume:	113
Number:	2
Number of Pages:	13
Page Range:	pp. 197-209
DOI:	10.1007/s10658-005-2331-4
Publication Status:	Published

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