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Abstract

Aim: To investigate selected factors of two nonaerated compost teas (NCT) and mechanisms that influence the restriction of several fungal potato pathogens.Methods and Results: Two NCTs, made from either commercial compost, (CCT) or vineyard compost (VCT), were tested for their ability to suppress potato pathogens. The VCT was more suppressive than CCT to mycelial growth of Alternaria solani and Rhizoctonia solani isolate 299, but not for R. solani isolate 422. Metagenomic studies of microbial diversity revealed that the CCT had higher fungal and bacterial diversity and richness than the VCT. Use of CCT significantly reduced lesion area of Alternaria alternata on detached leaves, however, a gum adjuvant did not lead to significantly greater control. Scanning microscopy showed that the spatial distribution of microbes from the CCT was altered with gum addition, to resemble what may have been a microbial biofilm.Conclusion: We confirmed that each NCT could suppress the mycelial growth of selected potato pathogens in culture, and CCT reduced A. alternata lesions on detached leaves. Factors including concentration, microbial communities and physio-chemical properties could not be consistently linked to NCT efficacy.Significance and Impact of Study: This study particularly highlights the application of scanning microscopy to study the interaction between pathogens and putative NCT microbes on foliar surfaces. This adds insight to mechanisms of NCT efficacy, along with physico-chemical and microbial characterization of the teas. This study shows the potential for the use of NCTs as a crop protection tool of low-cost which could be of particular benefit in smallholder agriculture.

Item Type:	Article
Authors/Creators:	Mengesha, WK and Gill, WM and Powell, SM and Evans, KJ and Barry, KM
Keywords:	compost, biocontrol, potato, antifungal, pathogen, 16S and ITS sequencing, Altemaria, microbe-pathogen interaction, microbial diversity, Rhizoctonia, scanning electron microscope
Journal or Publication Title:	Journal of Applied Microbiology
Publisher:	Blackwell Publishing Ltd
ISSN:	1364-5072
DOI / ID Number:	https://doi.org/10.1111/jam.13530
Copyright Information:	Copyright 2017 The Society for Applied Microbiology
Related URLs:	UTAS Profile: Powell, SM Google Scholar: Evans, KJ UTAS Profile: Evans, KJ Google Scholar: Barry, KM UTAS Profile: Barry, KM
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