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

From: Titel Ryzhomer <thegoodjob_at_hotmail.com>
Date: Wed, 20 Oct 2004 23:15:52 -0000

Hi Ted,

Yes, I've actually observed with magnification the powdery mildew
structure breaking down after spraying (under magnification it has a
building block, almost geodesic (sp) structure) and eventually
disappearing, sometimes leaving a scar. This efficacy has not been
apparent with every batch of CT, however other batches have helped
to control it as you have indicated regarding grape plants. I am
aware that there are many types of powdery mildew and perhaps this
CT is working only on the variety we have growing here on
delphineas, roses, some herbs, Indian Hemp or Dogbane {Apocynum
androsaemifolium} and a weed that appears to belong to the Evening
Primrose family. It has been quite easy to induce the powdery mildew
(for research purposes) through use of poor growing conditions, etc.

I hope this helps to clarify.

Regards,
Titel

--- In compost_tea_at_yahoogroups.com, "Ted Peterson"
<ted.peterson_at_t...> wrote:
> Titel:
>
> You are suggesting that CT can cure powdery mildew once it is
established?  This hasn't been my experience of three years and five
different vinyards.  I have seen the spread controlled but I have
not seen a cure.  In my experience, CT is not a fungicide and you
seem to indicate that it can work that way.  If not, please clarify.
>
> Ted Peterson
> EW/SOE
>   ----- Original Message -----
>   From: Titel Ryzhomer
>   To: compost_tea_at_yahoogroups.com
>   Sent: Wednesday, October 20, 2004 11:48 AM
>   Subject: [compost_tea] Re: Phytopathology journal article on
compost tea, November 2004
>
>
>
>   Hi Steve,
>
>   Here is some related anecdotal information. We have been brewing
>   batches of air charged compost tea for several months now.
>   Previously we have been doing farm research on control of
powdery
>   mildew having limited success with yogurt fermentations and even
>   less success with EM fermentations both applied as a foliar
spray.
>   Our compost teas were usually highly effective in suppressing
>   powdery mildew when using about 1% black strap molasses. When we
>   brewed batches with less black strap molasses this effectiveness
is
>   greatly reduced. This seems to indicate that a higher bacterial
>   content is more effective to suppress powdery mildew. Other
>   ingredients were young compost, worm castings, kelp meal, rock
>   phosphate granules, pyrophylite clay powder and fish
hydrolisate. I
>   have seen powdery mildew disappear over night with one
application.
>   This particular tea recipe does not seem great as a soil drench
and
>   we are experimenting with brewing a tea with a higher fungal
content.
>
>   Regards,
>   Titel
>
>   --- In compost_tea_at_yahoogroups.com, "Steve Diver" <steved@n...>
>   wrote:
>   >
>   > Fyi, this article has been copied to the Files Section,
>   > via the following file name:
>   >
>   > compost-tea-Scheuerell-Mahaffee-Phytopathology94.pdf
>   >
>   > The journal statement for this paper indicated:
>   >
>   > "This article is in the public domain and not
>   > copyrightable.  It may be freely reprinted with
>   > customary crediting of the source. The American
>   > Phytopathological Society, 2004."
>   >
>   > Further permission to post this paper to the Files Section
>   > was obtained from APS and the senior author. 
>   >
>   > Keep in mind this research was conducted during
>   > the 1998-2003 period.
>   >
>   > Also see:
>   >
>   > USDA CRIS 303-5358-22000-024-OOD
>   > http://cris.csrees.usda.gov
>   >
>   > Also see:
>   >
>   > Scheuerell, S., and W. Mahaffee. 2002.  Compost Tea:
Principles
>   > and Prospects for Plant Disease Control. Compost Science
>   > and Utilization. 10(4): 313-338.
>   >
>   >
>   > Best regards,
>   > Steve Diver
>   >
>   >
>   > --- In compost_tea_at_yahoogroups.com, "Steve Diver"
<steved_at_n...>
>   wrote:
>   > >
>   > > 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.
>
>
>
>
>         Yahoo! Groups Sponsor
>               ADVERTISEMENT
>             
>       
>       
>
>
> -------------------------------------------------------------------
-----------
>   Yahoo! Groups Links
>
>     a.. To visit your group on the web, go to:
>     http://groups.yahoo.com/group/compost_tea/
>      
>     b.. To unsubscribe from this group, send an email to:
>     compost_tea-unsubscribe_at_yahoogroups.com
>      
>     c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms
of Service.




Yahoo! Groups Sponsor
ADVERTISEMENT
click here


Yahoo! Groups Links

Received on Wed Oct 20 2004 - 19:52:08 EDT

This archive was generated by hypermail 2.3.0 : Tue Feb 07 2012 - 14:15:32 EST