Alternative treatments for late blight control in organic potato: Antagonistic micro-organisms and compost extracts for activity againstPhytophthora infestans |
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Authors: | R Ghorbani S Wilcockson C Leifert |
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Institution: | (1) Centre for Organic Agriculture, University of Newcastle, Nafferton Farm, Stocksfield, Newcastle upon Tyne, NE43 7XD, UK;(2) Present address: Department of Agronomy, Faculty of Agriculture, Ferdowsi University of Mashhad, P.O. Box 91775-1163, Mashhad, Iran |
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Abstract: | Summary The effects of various fungi, bacteria and different compost extracts on foliar infection of potato (Solatium tuberosum) withPhytophthora infestans were tested in detached leaf bioassays in 2001–2003. Application of microorganism inocula and compost extracts as well as
copper oxychloride to excised leaves resulted in different degrees of blight control. In general, suppression of blight lesion
growth was not improved by applying the antagonists before the leaves were inoculated withPhytophthora spores. There was some evidence that extracts made from different compost feed stocks of different ages suppressed leaflet
infection with blight. However, results were very limited and inconsistent. Moreover, the effects were much smaller than where
copper oxychloride was used. Improved efficacy of acceptable alternatives to copper fungicides especially in organic farming
is required. No promising effective alternative to the use of copper fungicides to reduce late blight infection in organic
potato production systems was identified in the experiments. |
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Keywords: | biocontrol compost pathogen |
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