Abstract:
Efficacy of selected plant extracts was studied on t the leaf spot tBipolarts
sorokiniana) and grain yield of wheat during December, 2005 to April, 2006. The
experiment was conducted in the laboratory and in the farm of the Sher-e-Bangla
Agricultural University,· Dhaka. Ten different treatments viz. T I (control), T2
(Vitavax 200 @ 0.3 %), T) (Onion bulb extract 1:2 w/v), T4 ( Garlic clove extracts
1:2 w/v), T, (Kalizira extracts 1:2 w/v), T6 (Zinger Rhizome extracts 1:2 w/v), T7
(Allamanda leaf extract 1:2w/v), Ts (Bishkatali extracts 1:2 w/v), T9 (Neem leaf
extract 1:2 w/v) and TIO ( Mehedi leaf extracts 1:2 w/v). Were explored in the
experiment in the laboratory the plant extracts were used in three concentrations
i.e. 1: 1, 1:2 and 1:4 w/v. All the plant extracts except Mehedi increased seed
germination in ·the laboratory in compared to untreated control. The highest
incidence of seed borne Bipolaris sorokiniana was recorded under control (T). A
remarkable reduction of the incidence of fungi was achieved by treating seeds with
botanicals. The leaf spot severity of flag leaf and penultimate leaf and 3rd leaf
differed significantly from one treatment to another at flag leaf, flowering, milking
and hard dough stages. The lowest severity of flag leaf in every stage was found in
treatment T2 followed by treatment Ts and treatment T4. The highest disease
severity of flag leaf, penultimate leaf and third leaf in all growth stages was
recorded under the treatment TI (untreated control). Significantly the highest plant
height (85.77 ern) and distance between the point of flag leaf initiation and base of
ear (15.62 em) were found in the treatment T4, ear length (19.98cm) in treatment
Tg, number of tillers/plant (6.48) in treatment TIO, number of spikes/plot (513.66)
were found under the treating seeds with botanicals. But the highest number of
grains/ear (43.98), weight of grains/ear (1.88g), grain yield (3.52 t/ha) and straw
yield (6.85 tlha) was found in T2~ Extract. of Onion, Garlic, Kalizira, "Zinger,
Bishkatali and Neem resulted statistically similar grain yield as of seed treatment
with Vitavax-200 (T2)'
Description:
A Thesis
Submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka
in Partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE (MS)
IN
PLANT PATHOLOGY
