Abstract

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 (Eucalyptuscinarium), 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 againstPhytophthora 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%) ofPhytophthora 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.

Key words: Leaf extracts, bioagents, antifungal activity, gummosis, Phytophthora, mandarin orange.