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Native Bacteria Are Effective Biocontrol Agents at a Wide Range of Temperatures of Neofusicoccum parvum, Associated with Botryosphaeria Dieback on Grapevine

Summary

Researchers from Chile identified native bacteria (specifically Pseudomonas strains) that effectively prevent a destructive fungal disease affecting grapevines. These bacteria can work across a wide range of temperatures and significantly reduce fungal growth both in laboratory tests and in actual vineyard conditions. This discovery offers an environmentally friendly alternative to chemical fungicides for protecting grapevines, particularly important as younger vines appear more vulnerable to infection.

Background

Botryosphaeria dieback is a significant grapevine trunk disease caused by fungal pathogens including Neofusicoccum parvum, representing a serious threat to viticulture worldwide. Chemical control methods have become problematic due to environmental and health concerns, increasing the need for sustainable biocontrol alternatives.

Objective

This study evaluated the biocontrol potential of Chilean native bacteria isolated from wild flora and endophytic communities against Neofusicoccum parvum in vitro, in vivo, and in situ to develop sustainable management strategies for grapevine trunk diseases.

Results

Pseudomonas sp. strains AMCR2b and GcR15a showed the highest biocontrol potential with up to 50% inhibition in agar diffusion assays and 46% in double-plate assays. In vivo testing demonstrated 17-90% mycelial growth inhibition, with younger grapevines (1-5 years) being more susceptible. Field trials showed Sauvignon Blanc was more susceptible than Cabernet Sauvignon.

Conclusion

Pseudomonas sp. strains AMCR2b and GcR15a demonstrate significant potential as effective biocontrol agents against N. parvum across a wide range of temperatures, contributing to sustainable viticulture practices and reducing reliance on chemical fungicides.
  • Published in:Plants (Basel),
  • Study Type:Experimental Study,
  • Source: 10.3390/plants14071043, PMID: 40219111
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