Abstract:
Three experiments were conducted for investigation and survey on diseases of rose
during January 2018 to April 2019. Six nurseries of Savar and Agargaon were
investigated for nursery diseases. Field investigation was conducted in Jashore, Dhaka
and Manikganj districts of Bangladesh. Eighteen villages from 4 Unions of Jhikorgacha
Upazila of Jashore district, two villages from Savar upazila of Dhaka and two villages
from Singair upazila of Manikganj were selected for investigation. The disease incidence
and severity were recorded under natural epiphytic conditions. Eleven diseases were
recorded and identified in field conditions viz. leaf spot, black spot, leaf blight,
flower
blight, powdery mildew, mosaic, dieback, stem dry rot, dry brown spot, foot rot, and rust
disease. The major mycoflora associated with these diseases were Pestalotia guepinii.,
Alternaria spp., Botrytis cinerea, Penicillium sp., Cercospora sp. Cladosporium sp.,
Epicoccum purpurescens, Nigrospora sp., Curvularia lunata and Podosphaera pannosa
(Oidium sp.). However, the powdery mildew disease caused by Podosphaera pannosa
(Oidium sp.) became major disease in recent years in Jashore. The incidence and severity
of diseases of rose varied significantly among the locations. Depending on the disease
incidence and severity, the major diseases of rose were black spot, leaf spot, leaf blight,
flower rot and powdery mildew. In leaf spot disease, the highest disease incidence and
severity were recorded in Panisara (43.33%) and Singair (11 %), respectively. In case of
black spot disease of rose the highest disease incidence and severity were recorded in
Singair that were 86.33% and 25.00%, respectively. The highest leaf blight incidence
was 61.67% recorded in Kulia and the highest severity was observed in Singair which
was 9%. In flower blight disease, both highest disease incidence and disease severity was
recorded in Godkhali which were 95% and 33.33%, respectively. The both highest
disease incidence and disease severity of powdery mildew were recorded in Godkhali
which were 98.33% and 30%, respectively. Three diseases viz. dry brown spot, stem dry
rot and foot rot of rose was recorded in Jashore. Apart from this, a survey was carried out
on the socio-economic status of rose farmers and problem related rose cultivation in
Bangladesh. Altogether, 63 farmers were interviewed in Jashore, Dhaka and Manikganj
district of Bangladesh. This study revealed that the highest percent of farmers came
from the age group of 30 to 40 years and had secondary level of education. Most of the
farmers express their opinion about positive relationship among insect pest, disease and
weed infestation in the rose field.
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
IN
PLANT PATHOLOGY