[compost_tea] Suppression of Septoria Leaf Spot Disease of Tomato Using Aerated Compost Tea
Title Suppression of Septoria Leaf Spot Disease of Tomato Using
Aerated Compost Tea
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
Session Poster Session - 42
Topic: Organic Horticulture
Date: Tuesday, July 20, 2004
Time: 12:30 PM - 01:30 PM
Location: Rio Grande Exhibit Hall
Author Contacts Chandrappa Gangaiah* - chandru_at_ksu.edu
Edward E. Carey - tcarey_at_ksu.edu
Ned A. Tisserat - tissne_at_plantpath.ksu.edu
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Received on Tue Oct 26 2004 - 14:17:27 EDT
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