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Suppression of potato bacterial Wilt with non-aerated compost tea and factors which influence efficacy


Mengesha, W and Powell, S and Evans, K and Barry, K, Suppression of potato bacterial Wilt with non-aerated compost tea and factors which influence efficacy, Proceedings from Science Protecting Plant Health, 26-28 September 2017, Brisbane, Australia, pp. 51. (2017) [Conference Extract]

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The use of water extracts from composted organic waste to suppress crop diseases has particular potential in developing countries and small-holder agriculture where resources are limited. These extracts can be produced by low-cost, non-aerated methods to prepare "non-aerated compost tea" and previous studies have shown that application can lead to reduction of a wide range of foliar and soil borne diseases in horticultural crops.

The bacteria Ralstonia solanacearum is a major pathogen of potato in many regions of the world and there are few successful control methods. Glasshouse trials were conducted in Ethiopia to examine if non-aerated compost teas could reduce disease and what influence various factors had on the degree of efficacy. These included production factors (i.e. compost type and resulting microbiological and physico-chemical properties), application factors (timing of application, concentration) and the addition of adjuvants. In this experiment, compost teas made from agricultural waste compost were more effective to reduce disease severity than those made from solid municipal waste or vermicompost tea. Moreover, application of NCT at the same time that potato tubers were planted and inoculated with pathogenic R. solanacearum led to greater disease reduction than when applied 7 days before or after introducing the pathogen inoculum. The most effective treatment resulted in a 2.5-fold reduction in disease compared to the non-treated controls, based on the "area under the disease progress curve" parameter. In a second glasshouse trial, the addition of myrrh gum led to the greater reduction of disease severity than compost tea alone.

Item Details

Item Type:Conference Extract
Keywords:potato, ralstonia, bacterial wilt, compost tea, crop protection
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Horticultural production
Research Field:Horticultural crop protection (incl. pests, diseases and weeds)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural crops
Objective Field:Field grown vegetable crops
UTAS Author:Mengesha, W (Mr Wossen Mengesha)
UTAS Author:Powell, S (Dr Shane Powell)
UTAS Author:Evans, K (Associate Professor Katherine Evans)
UTAS Author:Barry, K (Associate Professor Kara Barry)
ID Code:125448
Year Published:2017
Deposited By:Agriculture and Food Systems
Deposited On:2018-04-18
Last Modified:2018-04-19

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