Exploring eco-friendly solutions for Phytophthora disease management: Harnessing the anti-oomycete potential of a fermented lemon waste formulation

Phytophthora species pose significant challenges to agricultural and natural ecosystems due to their ecological plasticity and ability to cause diseases of various plant species. Effective control of Phytophthora diseases requires integrated approaches that consider specific agronomic practices, environmental factors, and the rationale use of chemicals. In response to the need for eco-friendly alternatives, this study investigated the anti-oomycete potential of a formulation derived from the fermentation of lemon wastes by Lactiplantibacillus plantarum ('bioact-LM'). In vitro assays demonstrated the significant anti-oomycete efficacy of bioact-LM against multiple Phytophthora species, both through direct contact inhibition and the release of volatile organic compounds (VOCs). In vivo assessments on orange and apple fruits further confirmed the effectiveness of bioact-LM in reducing Phytophthora rot severity. These findings suggest bioact-LM is promising as a sustainable alternative to synthetic fungicide for Phytophthora disease management, highlighting the importance of exploring eco-friendly solutions in a scenario of environmental challenges and restriction in the use of conventional chemical control methods. [Display omitted] •Broad spectrum anti-Phytophthora activity of a lemon peel-based medium fermented by Lactiplantibacillus plantarum (LM).•VOCs released by LM contribute to its anti-Phytophthora activity.•Treatment with LM controls Phytophthora rot in orange and apple fruit.•LM can be exploited as a natural substance to control post-harvest fruit spoilage.