EVALUATION OF
SEED TREATMENT AGAINST SHEATH BLIGHT DISEASE OF HYBRID RICE UNDER NATURAL
EPIPHYTIC CONDITION
M. R. Amin, A.
N. F. Ahmmed*, M. S. Islam, S. R. Chowdhury and M. A. Khaleque
*Corresponding author;
Email: nomanfarook@yahoo.com
Abstract
An investigation was carried out to
evaluate the efficacy of some selected seed treatments on the incidence and
severity of sheath blight (ShB) disease and yield contributing characters of
imported hybrid rice in the Seed Health Laboratory of the
Department of Plant Pathology and the field of
Sher-e-Bangla Agricultural University farm, Dhaka, Bangladesh during the period
of November 2009 to December 2010. Eleven seed treating agents viz. untreated
control, sun drying, polythene solarization, brine solution, neem leaf extract (Azadirachta indica), allamanda leaf extract (Allamanda cathartica), hot water treatment, Provax 200 (carboxin), Bavistin 50 WP (carbendazim), Dithane M 45 (mancozeb) and Trichoderma
harzianum were evaluated against the incidence and severity of sheath
blight disease at
three growth stages (flowering, milking
and maturity) and yield contributing characters. It was observed that disease
incidence and severity was gradually increased from flowering stage to maturity
stage with the age of the plant and minimum incidence and severity gave the
maximum yield. Disease incidence and severity caused by Rhizoctonia solani
varied from 15.87% to 20.30% and 6.47 to 7.80 (0-9 scale), respectively at
maturity stage where hot water treatment showed the best result followed by Provax
200. The highest values of plant height, panicle length, effective panicle and
filled grain were recorded under the fungicidal seed treatments followed by hot
water treatment. The highest grain yield (10.40 t ha-1) was recorded
under Dithane M 45 followed by Bavistin 50 WP and Provax 200. The lowest grain
yield (7.27 t ha-1) was found under polythene solarization which was
statistically identical with untreated control.
Key words: Seed treatment, hybrid rice, seed
borne diseases and sheath blight disease.
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Return Volume: Journal of Experimental Biosciences 5(2): July 2014
