[compost_tea] Plant Disease journal article on compost teas, August 2003

From: Steve Diver <steved_at_ncat.org>
Date: Wed, 20 Oct 2004 01:42:32 -0000

Suppression of Bacterial Spot of Tomato with Foliar Sprays
of Compost Extracts Under Greenhouse and Field Conditions.

Jaber H. Al-Dahmani, Pervaiz A. Abbasi, Sally A. Miller,
and Harry A. J. Hoitink

Department of Plant Pathology, The Ohio State University, Ohio
Agricultural Research and Development Center, Wooster 44691.

Plant Dis. 87: 913-919. August 2003
Volume 87, Number 8

http://www.apsnet.org/pd/

Abstract

The efficacy of foliar sprays with compost water extracts
(compost extracts) in reducing the severity of bacterial spot
of tomato caused by Xanthomonas vesicatoria was investigated.
Extracts prepared from composted cow manure, composted pine bark,
an organic farm compost, or composted yard waste, applied
as foliar sprays on tomato transplants, resulted in a moderate
but statistically significant reduction in the severity of
bacterial spot. The population of X. vesicatoria
in infected leaves was reduced significantly by extracts
prepared from composted cow manure. Efficacy of the water
extracts was not affected by oxygen concentrations in the
suspension during extraction, compost maturity, or sterilization
by filtration or autoclaving. The degree of control provided
by foliar sprays with the most effective compost extracts did
not differ from that obtained with the plant activator
acibenzolar-S-methyl. In the field in two growing seasons,
foliar sprays with compost water extracts did not reduce
the severity of foliar diseases, including bacterial spot.
During the 1997 season, when the severity of bacterial spot
in the field was high, foliar sprays with compost water
extracts significantly reduced the incidence of bacterial
spot on tomato fruit. Amending plot soil with several rates
of composted yard waste did not lead to additional control
of fruit disease over those only sprayed with extracts. Foliar
sprays with a mixture of chlorothalonil and copper hydroxide
or with acibenzolar-S-methyl reduced the severity of bacterial
spot as well as incidence of spot on fruit.

Additional keywords: benzothiadiazole, biological control,
chlorothalonil, compost-induced systemic resistance,
compost tea.




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Received on Tue Oct 19 2004 - 23:00:44 EDT

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