Journal of Pure and Applied MicrobiologyVol. 11 No. 4

Efficacy of Fungal and Bacterial Bioagents against Leaf Spot/Blight of Heliconia Caused by Drechslera State of Trichometasphaeria Holmii

S.S. Kansara1* and D.M. Joshi2

1Department of Plant Pathology, N.M. College of Agriculture, Navsari Agricultural University, Navsari, Gujarat, India. 2Plant Pathology Department, ASPEE College of Horticulture and Forestry, Navsari Agricultural University, Navsari, Gujarat, India.

Received on 10 May 2017 and accepted on 15 July 2017

 

ABSTRACT

Study on leaf spot/blight Drechslera state of Trichometasphaeria holmii (Luttrell) Subramanian & Jain. of Heliconia (Heliconia orthotricha L.) 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 at periphery and pathogen at the centre technique to monitor antagonistic effect. Results revealed that out of all the seven bio agents used, three bio agents viz., Aspergillus niger Link. (Navsari, isolate) (85.18 %, 84.67 % and 83.68 %), Pseudomonas fluorescens Migula. (Navsari isolate) (81.85 %, 75.86 %, and 62.76 %) and Trichoderma longibrachyatum Rifai.(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 the pathogen significantly.

Keywords : Biological control, antagonists, Heliconia, Drechslera state of Trichometasphaeria holmii.