Twenty plant leaf extracts viz., Acalypha indica, Azardiracta indica, Alternanthera sessilis, Aloe vera ,Vitex negundo, Wedelia calendulaceae, Centella asiatica, Ocimum tenuiflorum, Giliricidia maculate, Nila nirgundi, Leucas aspera, Lantana camera, Solanum trilobatum, Tephrosia purpurea, Hibiscus canabinus, Cissus quadrangularis, Mentha arvensis Polyanthes tuberose, Polygala elata and Solanum xanthocarpurm were tested against the growth of a sunflower leaf blight causing pathogen Alternaria helianthi by poisoned food technique under in vitro conditions. Among them, leaf extracts of Acalypha indica at 10 per cent concentration inhibited the mycelial growth, sporulation and spore germination to about 78.38 per cent, 85.90 per cent and 52.48 per cent respectively. The A. indica leaf extract was very effective against A. helianthi and can be used to manage this fungus under field condition.