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A study was conducted between 2010 and 2011 at Marathwada Krishi Vidyapeeth, Parbhani, to find out the efficacy of leaf extracts viz Neem (Azadirachta indica), Mehendi (Lowsonia inermis), Eucalyptus (Eucalyptus cinarium), Acacia (Acacia catechu), Glyricidia (Glyricidia sepium), Dhatura (Dhatura stramonium), Lantana (Lantana camera) and the antagonistic potential of bioagents viz Trichoderma viride, Trichoderma hamatum, Trichoderma harzianum, Trichoderma lignorum, Gliocladium virens and Pseudomonas fluorescens against Phytophthora spp. under in vitro conditions using 'poisoned food technique' and 'dual culture technique' respectively. L. camera was significantly more effective in inhibiting the mycelial growth (44.54%) of Phytophthora citrophthora and D. stramonium against Phytophthora nicotianae, inhibiting mycelial growth (57.78%), both at 5% concentration; whereas, among bioagents, T. harzianum was found significantly effective against both species inhibiting 84% mycelial growth of P. citrophthora and 91.86% of P. nicotianae.

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The present field study was undertaken to investigate the effective organic amendments against Ralstonia solanacearum under pot culture condition. The average (PESR+PESM) reduction in mortality recorded with all the organic amendments tested were ranged from 15.39 to 64.97% over untreated control. However, significantly highest reduction in average mortality was recorded with karanj cake (64.97%). This was followed by the organic amendments viz., neem seed cake (43.95%), farm yard manure (37.36%), vermicompost (32.95%), poultry manure (32.24%) and sunflower seed cake (26.87%). Whereas, safflower seed cake (21.40%), goat manure (19.28%), cotton seed cake (18.60%) and groundnut cake (15.39%) were found less effective. All the test amendments improve root length, shoot length and vigour index in ginger. Among the different amendments tested, significantly highest root length (6.16 cm), shoot length (12.56 cm) and vigour index (1372.73) were recorded with Karanj cake. The second best amendment found was neem seed cake (5.26 cm, 10.26 cm and 931.20) respectively. This was followed by the amendments viz.