Potato and taro are serving as a key food source for more than one billion population globally. However, the production of these crops attacked by different biotic factors. Among them, late blight caused by Phytophthora infestans and stem canker and black scurf disease caused by Rhizoctonia solani is the most devastating pathogens of the potato crop. On the other hand, leaf blight and corm rot caused by P. colocasiae is the biggest liming factor of taro production worldwide. The effective management strategies to control these pathogens depend on the frequent use of synthetic chemical fungicides. However, the use of fungicides has a long-term negative impact on the environment, human health, and livestock. Hence, the use of beneficial microbes as biocontrol agents are a promising alternative strategy to control these devastating pathogens. In this study, six Serratia strains and one Pseudomonas strain and their dual combinations as a biological control agent were tested on potato and taro pathogens in vitro and under greenhouse conditions. Besides, the biochemical and enzymatic activity of each strain was done to understand the mode of action provided by the strain to combat the pathogens. The study result showed that biocontrol bacteria suppress the growth of P. infestans, R. solani and P. colocasiae in vitro and under greenhouse conditions. However, a field experiment should be done to confirm the current study result.
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