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In vitro biocontrol potential of plant extract-based formulation against infection structures of Phytophthora infestans along with lower non-target effects

Summary

Researchers tested a plant extract-based treatment against late blight, a serious disease affecting potatoes and tomatoes caused by Phytophthora infestans. The formulated product was highly effective at very low concentrations, stopping the disease at multiple stages of infection. Importantly, it had minimal harmful effects on beneficial microorganisms, making it a promising eco-friendly alternative to synthetic fungicides.

Background

Late blight caused by Phytophthora infestans is a destructive disease affecting tomatoes and potatoes. Synthetic fungicide use is increasingly restricted due to environmental and health concerns, and fungicide-resistant strains are emerging. Plant extract-based biocontrol products offer promising sustainable alternatives for crop protection.

Objective

This study evaluated the in vitro inhibitory potential of a plant extract-based biocontrol product on different stages of P. infestans lifecycle including mycelial development, sporangia formation and germination, and zoospore formation and germination. The study also assessed non-target effects on fungi and bacteria representative of plant-associated microbial communities.

Results

FV completely inhibited P. infestans mycelial growth and sporangia germination at very low concentrations (0.01-0.05%), while PE showed effects only at high concentrations. Both formulations affected zoospore germination and membrane integrity, with FV demonstrating stronger efficacy. Non-target effects on fungi and bacteria were observed only at substantially higher concentrations than those required to inhibit P. infestans.

Conclusion

The plant extract-based biocontrol product demonstrated strong efficacy against P. infestans at multiple lifecycle stages with minimal impact on non-target microorganisms. The formulation enhanced the plant extract’s biocontrol activity, making it a promising candidate for integrated late blight management strategies.
  • Published in:Frontiers in Microbiology,
  • Study Type:In vitro Experimental Study,
  • Source: 40297289
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