Integrity Research Journals

ISSN: 2992-4928
Model: Open Access/Peer Reviewed
DOI: 10.31248/AJPB
Start Year: 2019

Bacillus cereus, Staphylococcus aureus, Aeromonas hydrophila, Pseudomonas aeruginosa and Proteus mirabilis associated with post-harvest storage of cocoyam (Colocasia esculentus L) corms rot: Occurrence and in vitro response to leaf extracts of Vernonia am   |   Article Number: 8277BF001   |   Vol.4 (2) - April 2023

Received Date: 18 December 2021   |   Accepted Date: 25 January 2022  |   Published Date: 30 April 2023

Authors:  Ijato J. Y.* , Olajide, O. O. and Ojo B.O.

Keywords: cocoyam, Anti-bacterial, V. amygdalina.

Cocoyam is a root crop that is produced in regions of the tropical or sub-tropical developing countries. In certain countries like Ghana, cocoyam production is surplus but post-harvest losses are high due to mechanical damage of corms during harvest which predisposes the corms to microbial attack in storage. Antibacterial activities of the test plant were determined using agar diffusion method. Five bacteria strains were isolated from rotten cocoyam corm viz: Bacillus cereus, Staphylococcus aureus, Aeromonas hydrophila, Pseudomonas aeruginosa and Proteus mirabilis. Cold aqueous extract of 20% of the test plant mostly inhibited Staphylococcus aureus (0.66) followed by Bacillus cereus (0.65). The least inhibited organisms being Pseudomonas aeruginosa (0.36) and Proteus mirabilis (0.38). Hot water extract (20%) of the test plant mostly inhibited Bacillus cereus (0.52) followed by Staphylococcus aureus (0.49). The results showed that higher concentrations of V.  amygdalina extracts inhibited the growth of organisms more than lower concentrations. The use of plant based biocide against bacterial isolates proves efficacious as they are effective, affordable and are less harmful to man and the environment.

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