Study on etiology, incidence and severity of Southern corn leaf blight, curvularia leaf spot, sheath blight and damping off of maize
Paper Details
Study on etiology, incidence and severity of Southern corn leaf blight, curvularia leaf spot, sheath blight and damping off of maize
Abstract
An experiment was conducted to determine the incidence and severity of different fungal diseases of maize occurred in the major maize growing regions (Bogra, Gaibandha, Mymensingh and Rangpur) of Bangladesh during January 2007 to March 2008. Incidence and severity of the diseases viz. southern corn leaf blight (Bipolaris maydis), curvularia leaf spot (Curvularia lunata), sheath blight (Rhizoctonia solani) and damping off of seedlings (Aspergillus spp., Fusarium spp. and Penicillium spp.) were recorded from a hybrid variety Pacific-984 and a high yielding variety Khai Vutta at seedling stage (30 DAS-Days After Sowing), vegetative growth stage (60 DAS) and silking stage (90 DAS) of the plant. The etiology of the diseases was also studied. Considering all growth stages of plant, the comparative analysis revealed that incidence and severity of the diseases varied from one district to another, but almost minimum levels of infection were observed in Rangpur followed by Bogra, Gaibandha and Mymensingh. The results also depicted that southern corn leaf blight and curvularia leaf spot were found at all the growth stages of plants, sheath blight was found at vegetative stage and silking stage, where as damping off symptoms were recorded only at seedling stage of maize plants. As the pathogens have negative influence on plant health as well as yield so, special attention should be given by the growers to minimize the fungal infections by promoting good agricultural practices in the maize growing districts of the country.
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