[compost_tea] Compost tea abstracts at ASHS 2004 - Am. Soc. Hort. Science

From: Steve Diver <steved_at_ncat.org>
Date: Sun, 12 Sep 2004 18:58:38 -0500

Passing along two abstracts on compost teas for tomato
disease control.

One trial showed a positive effect, while the second trial showed no
effect.

The Soil Soup brewed compost tea showed no effect, but
neither did the Serenade biopesticide in the same trial, whereas
a copper fungicide was comparable to a conventional fungicide
control.

Regards,
Steve Diver

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1.

Organic Horticulture Posters at ASHS
American Society for Horticultural Science
Austin, Texas | July 17–20, 2004
http://tinyurl.com/3tzt5


2.

Title
Control of the Foliar Disease, Septoria lycopersici, in Organic
Tomato Production
http://tinyurl.com/5cqoh

Abstract
Disease management in organic tomato production poses one of the
greatest challenges for organic producers in humid climates. Both
organic and conventional tomato growers have relied on copper (Cu)
fungicides to control many diseases, including Septoria lycopersici
common in tomato production. Concerns have been raised regarding
the use of Cu fungicides, because of their potential to cause plant
damage and toxicity to beneficial organisms. The objectives of this
research were to: 1) investigate the efficacy of compost tea made
from either windrow composted cattle manure (WCCM) or
vermicomposted cattle manure (VCM), and 2) compare the efficacy
of organic fungicides with conventional fungicides to control
S. lycopersici in organic tomatoes.

Treatments included 1) a control, 2) a conventional treatment in which
fungicide applications of Bravo plus Cu and Quadris plus Cu were
alternated, 3) copper fungicide (Champion), 4) Serenade TM Fungicide
(Bacillus subtilis), 5) WCCM compost tea, and 6) VCM compost tea.
Disease pressure was mostly from the bacteria speck/spot complex.
Disease severity was significantly (P < 0.05) reduced and marketable
yield was 60% higher with the two Cu treatments (No. 2 and 3),
compared to other treatments. A follow-up greenhouse experiment is
in progress and will be presented with the field data.

Poster Board #290

Karen Joslin, Henry Taber, Sara Helland, Mark Gleason
Iowa State University


3.

Title
Suppression of Septoria Leaf Spot Disease of Tomato Using
Aerated Compost Tea
http://tinyurl.com/5gf3d

Abstract
Compost teas, made using an aerated brewing process, have been
reported to have potential for controlling a range of plant diseases
and improving crop health. Septoria leaf spot of tomato, caused by
the fungus Septoria lycopersici, is a common and destructive disease
of tomato in Kansas. A field trial was conducted at Wichita, Kansas
during Summer 2003 to evaluate the potential of pre-plant compost,
and compost tea applied as a foliar spray or through drip fertigation,
to control Septoria leaf spot of tomato. The experimental design included
three factors: Pre-plant application of 13N–13P–13K or vermicompost;
fertigation with CaNO3 or compost tea; and foliar spray with compost tea,
fungicide (Dithane) or water. A split plot design was used with fertigation
treatments as main plots and the other two factors as sub-plots. There
were 3 replications. Tomato cultivar Merced was used and individual
plots consisted of 5 plants grown on beds covered with red plastic
mulch and supported by stake and weave system.

Aerated compost tea was brewed weekly using a vermicompost-based
recipe including alfalfa pellets, molasses, humic acid, fish emulsion
and yucca extract and applied to plots starting 2 weeks after
transplanting.
Disease incidence and severity were recorded weekly for 3 weeks following
the appearance of disease. Plots were harvested twice weekly and counts
of No. 1, No 2 and cull grade tomatoes were recorded.

There were no effects of pre-plant or fertigation treatments on Septoria
leaf
spot disease, but there was a significant effect due to foliar sprays, with
mean severity of compost-tea-sprayed plots (26.3%) and fungicide-sprayed
plots (31.9%) significantly lower than water-sprayed plots (45.9%) at trial
termination.

Poster Board #292

Chandrappa Gangaiah, Edward E. Carey, Ned A. Tisserat
Kansas State University


4.

View program and search on keywords for abstracts:

ASHS 2004 Annual Meeting Conference Program and Abstracts
http://www.ashs.org/annualmeeting/conference/index.lasso


5.

Related paper from Iowa State:

Control of the Foliar Disease, Septoria lycopersici, in Organic Tomato
Production
Karen R. M .Joslin and Henry G. Taber
Department of Horticulture, Iowa State University
http://www.public.iastate.edu/~taber/Extension/Progress%20Rpt%2003/OrgTom.pdf

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Received on Sun Sep 12 2004 - 20:35:16 EDT

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