Efficacy Of Fungal And Bacterial Bioagents Against Leaf Spot/Blight Of Heliconia Caused By Drechslera State Of Trichometasphaeria Holmii

Kansara S. S.1*and Joshi D.M.2

^*1Assistant Professor, Department of Plant Pathology, N.M. College of Agriculture, Navsari Agricultural University, Navsari, Gujarat, India,E-mail: [email protected]

²Retired-Professor, Plant Pathology Department, ASPEE College of Horticulture and Forestry, Navsari  Agricultural University, Navsari, Gujarat, India

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DOI: http://dx.doi.org/10.22207/JPAM.11.4.40</h4>
(Received: 10 May 2017; accepted: 15 July 2017)

Abstract:

Studyon leaf spot/blightDrechslera state of Trichometasphaeriaholmii(Luttrell) Subramanian & Jain. ofHeliconia(HeliconiaorthotrichaL.)under south Gujarat condition was carried out to find out suitable management strategies of this newly reported disease. Due to hazardous effect of chemical fungicides, search for safer alternative to control the pathogen is better option. This led to trials on the use of bio agents to control the pathogen. The seven known bio agents were evaluated by dual culture, pathogen atperiphery and pathogen at the centre technique to monitor antagonistic effect. Results revealed that out of all the sevenbio agents used, three bio agentsviz.,Aspergillusniger Link. (Navsari, isolate) (85.18 %, 84.67 % and 83.68 %),Pseudomonas fluorescensMigula.(Navsari isolate) (81.85%, 75.86%, and 62.76%) and TrichodermalongibrachyatumRifai.(I.A.R.I., isolate) (76.66 %, 55.93 %, 81.56 % maximum growth inhibition in dual culture, pathogen at periphery and pathogen at the centre methods respectively),showed strong antagonistic effect to inhibit the mycelia growth of thepathogen significantly.

Keywords:

Biological control, antagonists, Heliconia,Drechslera state of Trichometasphaeriaholmii