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Aqueous extract of twenty different plant species were invitro evaluated for their inhibitory effect on mycelial growth of Sclerotium (Athelia) rolfsii causing southern sclerotium rot in sugar beet, at pathology laboratory of Sugar Crops Research Program, National Agricultural Research Centre, Islamabad, Pakistan. Generally, all plant species inhibited mycelial growth of the pathogen but maximum inhibition was recorded by Azadirachta indica (73.8%) followed by Cassia fistula (73.5%) and Cannabis sativa (67.1%). The minimum inhibition was showed by Trigonella foenumgraecum (34.3%) and Cassia angustifolia (36.3%).