INVESTIGATION ON NURSERY AND FIELD DISEASES OF ROSE (Rosa spp.) IN SELECTED AREAS OF BANGLADESH

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.