Thanks Tom for the excellent info. I will pass it along.
Ross
----- Original Message -----
From: Tom Jaszewski
To: compost_tea_at_yahoogroups.com
Sent: Monday, February 10, 2003 4:01 AM
Subject: RE: [compost_tea] early blight in tomatoes
Basilios Papageorgiou, Jürgen Helbig, Carmen Büttner:
Ability of Watery Extracts of Composted Organic Waste from Urban Househol=
ds to Control Airborne Plant Pathogens
BASILIOS PAPAGEORGIOU, JÜRGEN HELBIG, CARMEN BÜTTNER
Humboldt University Berlin, Institute of Horticultural Sciences, Germany=
The effect of compost applications on plant health has mainly been invest=
igated regarding soil borne diseases. The few investigations on the effecti=
veness of shoot treatments with watery compost extracts showed that leaf pa=
thogens were effectively controlled and that different mechanisms seemed to=
be involved. Additionally to systemically acquired induced resistance, som=
e other antagonistic mechanisms of the microorganisms present in compost ex=
tracts were observed, including production of antibiotics, concurrence for =
nutrients or parasitism. In the present investigation, the effectiveness of=
watery extracts from composts that were produced from organic household wa=
ste in West Africa, was examined using the pathosystem tomato and Alternari=
a solani.
Applications of watery compost extracts successfully suppressed infection=
of A. solani on tomato. Different factors were checked for their impact on=
the effectiveness of the extracts and the density of microorganisms presen=
t in the extracts. Temperature and frequency of stirring significantly infl=
uenced the density of microorganisms and the effectiveness against A. solan=
i. Daily stirring of the compost-water mixture during the extraction period=
(3 days) increased the density of microorganisms sevenfold and disease inc=
idence was reduced by [27]% as compared to the treatment with only one init=
ial stirring. The incubation of the compost-water mixture at [20]C increase=
d the number of microorganisms in the extract tenfold as compared to mixtur=
es incubated at 30 and [35]C. The extract incubated at [20]C reduced incide=
nce of A. solani by [66]% as compared to the control, whereas the other var=
iants were less effective.
The formulation substances cellulose, alginate and xanthan were added to =
the extracts to increase their effectiveness against the pathogens. The ext=
ract enriched with xanthan reduced disease incidence on tomato by [23]% as =
compared to the extract without formulation substances.
Storage duration of the composts after their preparation significantly in=
fluenced the density of microorganisms present in the extracts and their ef=
fectiveness against A. solani on tomato. Those composts that were stored fo=
r a shorter period showed a higher number of microorganisms in the extract =
and a higher effectiveness of the extracts
Tom Jaszewski
www.livesoil.com
702-595-7012
-----Original Message-----
From: Ross Orner [mailto:rorner_at_pennswoods.net]
Sent: Sunday, February 09, 2003 7:28 PM
To: compost_tea_at_yahoogroups.com
Subject: [compost_tea] early blight in tomatoes
Does anyone have any experience with the effects of compost tea on early =
blight on tomatoes? This is a problem disease for a producer in New Jersey =
conditions.
Thank you,
Ross Orner
www. ornerfarms.com
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Received on Mon Feb 10 2003 - 22:19:39 EST