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Asian Journal of Plant Pathology
  Year: 2021 | Volume: 15 | Issue: 1 | Page No.: 1-13
DOI: 10.3923/ajppaj.2021.1.13
 
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Biocontrol of Seed Decay, Seedling Damping-off and Plant-Growth Promotion of Cocoa Seedlings with Antagonistic Microbes

Stephen Larbi-Koranteng

Abstract:
Background and Objective: Black pod disease of cocoa affects every part of the pant development from nursery to the pod. Raising healthy cocoa seedlings at the nursery, therefore, ensures better seedling establishment in the field. This study sought to develop a biocontrol option for seed decay and damping-off disease of cocoa and at the same time, promote seedlings growth with antagonistic microbes. Materials and Methods: The experiment consisted of two parts; preliminary tube experiment and pot experiment. Oven sterilized topsoil in plastic tubes were infested with P. palmivora suspension prepared from a 14 days-old culture and incubated on a planthouse bench. After two weeks, infested soils were separately drenched with broth supensions of the microbial antagonist sowing. Four replicate tubes per treatment were established. In the pot experiment, similar treatment was subjected to a steam topsoil for two weeks. The infested soil distributed in separate tubes or plastic pots and either drenched with NB suspension of the rhizobacterium, PDA suspensions of Aspergillus and Penicillium spp. or seeds dipped in microbial suspensions before sowing. The setups were maintained in the planthouse for six weeks and disease assessments as well as growth parameters were made or recorded on resulting seedlings respectively. Results: Broth suspensions of the microbial antagonists either used as a soil drench on Phytophthora-infested soil or as seed dip, prevented seed decay, damping-off and promoted seedlings growth with significantly higher (p<0.05) growth parameters in terms of dry matter, number of leaves, plant height and plant girth, relative to the untreated controls. Conclusion: The results from the current study demonstrate that the three microbial antagonists can be formulated and use for the management/prevention of the disease in the nursery.
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How to cite this article:

Stephen Larbi-Koranteng , 2021. Biocontrol of Seed Decay, Seedling Damping-off and Plant-Growth Promotion of Cocoa Seedlings with Antagonistic Microbes. Asian Journal of Plant Pathology, 15: 1-13.

DOI: 10.3923/ajppaj.2021.1.13

URL: https://scialert.net/abstract/?doi=ajppaj.2021.1.13

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