Re: [compost_tea] Phytopathology journal article on compost tea, November 2004

From: Ted Peterson <ted.peterson_at_tcsn.net>
Date: Tue, 19 Oct 2004 21:43:49 -0700

Steve:

Please contact me offlist at ted.peterson_at_earth-wise.com or ted.peterson_at_tc=
sn.net. I have some questions for you better handled off-list. Thanks.

Ted Peterson
EW/SOE
  ----- Original Message -----
  From: Steve Diver
  To: compost_tea_at_yahoogroups.com
  Sent: Tuesday, October 19, 2004 6:36 PM
  Subject: [compost_tea] Phytopathology journal article on compost tea, Nov=
ember 2004



  Compost Tea as a Container Medium Drench for Suppressing
  Seedling Damping-Off Caused by Pythium ultimum.

  Steven J. Scheuerell and Walter F. Mahaffee.

  Phytopathology 94:1156-1163. November 2004.
  Volume 94, Number 11

  http://www.apsnet.org/phyto/


  Abstract:

  Compost tea is being used increasingly in agricultural production
  to control plant diseases. However, there has been limited
  investigation relating disease control efficacy to various compost
  tea production methods, particularly compost tea produced with
  active aeration and additives to increase microbial population
  densities in compost tea. Aerated compost tea (ACT) and nonaerated
  compost tea (NCT), produced with or without additives, was
  investigated for the suppression of damping-off of cucumber
  caused by Pythium ultimum. Compost tea was used to drench
  soilless container medium inoculated with P. ultimum;
  effect on damping-off ranged from not suppressive to
  consistently suppressive depending on the method used to produce
  the tea. The most consistent formulation for damping-off
  suppression was ACT produced with kelp and humic acid additives.

  Producing ACT with a molasses-based additive inconsistently
  suppressed damping-off; evidence suggests that residual nutrients
  can interfere with disease suppression. Heating or diluting compost
  tea negated suppression. Across all compost tea samples, there was
  no significant relationship of bacterial populations, measured as
  active cells, total cells, or CFU, to disease suppression. However,
  for all ACT produced without the molasses-based additive, there
  was a threshold of bacterial population density (6 log(10) active
  cells per ml, 7.48 log(10) total cells per ml, or 7 log(10)
  CFU per ml) above which compost teas were suppressive.




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Received on Wed Oct 20 2004 - 01:05:18 EDT

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