African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

Evaluation of plant extracts and bioagents for the control of gummosis of mandarin orange (Citrus reticulata blanko) caused by Phytophthora species

Jagtap, G. P.1, Thosar, R. U.2 and Dey, Utpal3*      
Department of Plant Pathology, Marathwada Krishi Vidyapeeth, Parbhani – 431 402 (MS), India.  
Email: [email protected]

  •  Accepted: 25 June 2012
  •  Published: 21 August 2012

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 virideTrichoderma 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.