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Effect of aerated compost tea on grapevine powdery mildew, botrytis bunch rot and microbial abundance on leaves


Evans, KJ and Palmer, AK and Metcalf, DA, Effect of aerated compost tea on grapevine powdery mildew, botrytis bunch rot and microbial abundance on leaves, European Journal of Plant Pathology, 135, (4) pp. 661-673. ISSN 0929-1873 (2013) [Refereed Article]

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Copyright 2012 KNPV

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DOI: doi:10.1007/s10658-012-0103-5


Aerated compost tea (ACT), prepared from immature compost, was applied to foliage and fruit of grapevines (Vitis vinifera) to assess its potential for suppressing two important diseases: botrytis bunch rot, caused by Botrytis cinerea, and powdery mildew, caused by Erysiphe necator. An ACT applied to leaves of Cabernet Sauvignon vines in pots 7 days before inoculation with E. necator conidia reduced mean powdery mildew severity on the three youngest expanded leaves (at inoculation) to less than 1%; mean severity on non-treated, inoculated leaves was 15%. Multiple applications of ACTs at two vineyards in different growing seasons suppressed powdery mildew to < 1% mean severity on Chardonnay leaves (non-treated 79% severity) and bunches (non-treated 77% severity), and on Riesling leaves (non-treated 24% severity). The same treatments reduced the incidence of Chardonnay bunches with latent B. cinerea and Riesling bunches with sporulating B. cinerea, although the level of botrytis bunch rot in both experiments was not economically damaging. The numbers of culturable bacteria, fungi and yeasts on Chardonnay leaves were higher than pre-treatment levels 10 days after ACT application, as were fungal numbers on Riesling leaves 21 days after treatment. Suppression by ACTs of two fruit and foliar pathogens of grapevine with different biology and epidemiology indicated potential for their use as a tactic in integrated disease management. Further testing of ACTs is warranted in a range of viticultural environments and application regimes to fully understand the impact of this tactic on disease, grape and wine quality.

Item Details

Item Type:Refereed Article
Keywords:gray mold, grey mould, phyllosphere, Uncinula necator, viticulture
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Horticultural production
Research Field:Oenology and viticulture
Objective Division:Plant Production and Plant Primary Products
Objective Group:Industrial crops
Objective Field:Wine grapes
UTAS Author:Evans, KJ (Associate Professor Katherine Evans)
UTAS Author:Palmer, AK (Dr Alice Percy)
ID Code:73679
Year Published:2013
Funding Support:Australian Research Council (LP0453767)
Web of Science® Times Cited:7
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2011-10-21
Last Modified:2018-04-12
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