Biological control of onion pink root using antagonistic strains of bacteria

Issue Date

12-2017

Abstract

Pink root disease of onion is one of the most destructive causes of yield loss in the crop field. Some 380 strains of bacteria were recovered from onion's rhizosphere and purified on NA media. Out of these strains, 31 exhibited high antagonistic effects as shown in the dual-culture tests. Antagonistic potential of the selected bacteria were evaluated by their ability to produce antibiotics, volatile metabolites and siderophore and were selected for greenhouse experiments. The segregated antagonistic bacterias belong to the 5 species namely Bacillus laterosporus-, B. subtilis, Pseudomonas fluorescent, P. patida bv. B and P. aeroginosa. Biocontrol test on onion bulbs was performed by soil drenching with the factors arranged in a completely randomized design with 31 treatments and 3 replicates. P. fluorescent biovl MM- 19 and P. fluorescent biov. IV MM-252 showed the greatest effect on reduction of disease severity and growth parameters.

Source or Periodical Title

Philippine Journal of Crop Science

ISSN

0115-463x

Volume

42

Issue

3

Page

71-78

Document Type

Article

Frequency

tri-quarterly

Physical Description

tables, graphs, pictures

Language

English

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