Abstract:
The experiment was carried out at Sher-e-Bangla Agricultural University during 2008-09 according
to the 1STA rules following blotter method, agar plate method and rolled paper towel method.
Thirteen imported hybrids, two local hybrids and two local high yielding varieties were tested to
determine the seed health status. A total of twelve pathogens were associated with the collected
seeds viz. Xanthomonas spp, Rhizopus stolonifer, Aspergillus spp., Bipolaris oryzae, Fusarium
moniliforme, Curvularia lunata, Penicillum sp., Tilletia barclayana, Alternaria tenuissima,
Chaetomium globosum, Phoma sp and Nigrospora sp. The incidence of different pathogens vary
individually and independently among the hybrids and local varieties of rice seeds. Seed
germination varied from 54.63%- 99.50% in blotter method. The incidence range of Xanthomonas
spp. (0 -18.13%), Rhizopus stolonifer (0-19.75%), Aspergillus spp. (0-12.00%), Bipolaris oryzae (0-
18.00%), Curvularia lunata (0-4.25%), Penicillum sp. (0-1.75%), Tilletia barciayana (0-2.75%),
Alternaria tenuissima (0-0.63%), Chaetomium globosum (0-1.25%), Phoma sp (0-0.50%) and
Nigrospora sp.(0-0.25%) were detected by blotter method. Seed germination ranged from 8.25%96.38%
was recorded in rolled paper towel method. Non germinated hard seed ranged from 1.63%86.50%
and rotten seed 0.75%-12.00%. Post emergence mortality was observed 0-4.38% by rolled
paper towel method. The vigour index ranged from 96.36%-2329.28%. The incidence range of
Xanthomonas spp. (1.63%-5.13%), Rhizopus stolonifer (0-3.00%), Bipolaris oryzae (0-15.13%),
Fusarium moniliforme (0-7.63%), Curvularia lunata (0-6.38%), Penicillum sp.(0-1.63%),
Alternaria tenuissima (0-1.63%), Aspergillus flavus (0·6.50), Aspergillus niger (0-1.38%) sp and
Nigrospora sp.(0-1.38%) was detected by agar plate method. The detected predominant pathogens
were Xanthomonas spp., Bipolaris oryzae, Aspergillus sp. Fusarium moniliforme ,Rhizopus
stolonifer.
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
