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

journal contribution
posted on 2023-05-17, 08:36 authored by Katherine EvansKatherine Evans, Palmer, AK, Metcalf, DA
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.


Australian Research Council


Publication title

European Journal of Plant Pathology










Tasmanian Institute of Agriculture (TIA)


Springer Netherlands

Place of publication

VanGodewijckstraat30,Dordrecht, Netherlands,3311GX

Rights statement

Copyright 2012 KNPV

Repository Status

  • Restricted

Socio-economic Objectives

Wine grapes

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