Splash dispersal inRamulispora sorghi Olive and Lefebreve, the casual organism of sooty stripe of sorghum
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The conidia ofRamulispora sorghi were produced in a mucilaginous mass and dispersed through splash-off and wash-off mechanisms during rain, while the sclerotia ofRamulispora sorghi were produced freely and attached superficially to the host leaf surfaces, dispersed through air over short distances and deposited on the sampling surfaces at the rate of 22 sclerotia/cm2/day.
Greater number of conidia were monitored by splash traps during the kharif crop period as compared with that of rabi. The peak conidial dispersal was noticed during the 10-leaf stage—flag leaf growth stages of sorghum crop. Both incident water drops (splash-off) and flowing water drops (wash-off) liberated the conidia from the sporulating lesions. Peak liberation of conidia occurred with the water drops from 3–7 and most conidia were removed from the sporulating lesion within 60 s indicating the possible dispersal of the pathogen even during short traces of rain.
KeywordsRamulispora sorghi sooty stripe of sorghum splash dispersal epidemiology acrobiology
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