The Battle Against Fungal Threats: Wine-Growers Struggle to Protect Their Grapes

As New Zealand’s wine-growers face a challenging harvest plagued by the persistent humidity and rain of a wild La Niña summer, the reality of their reliance on pesticides becomes undeniable. Despite claiming to follow sustainable practices, the industry remains heavily dependent on fungicides to combat vine and grape diseases, primarily due to major threats such as powdery mildew, botrytis, and downy mildew. A significant reliance on a chemical warfare approach reveals fragility within the systems designed to protect crops.

A recent paper published in Gastronomica by Nick Lewis, Emma Sharp, and researchers, including myself, examines alternative agricultural methods, suggesting that the future of farming may lie not in enhancing chemical warfare but in adopting more holistic practices that abandon this battlefield mentality.

New Zealand’s current agricultural paradigm focuses on maintaining a sterile environment by applying fungicides every 7 to 14 days throughout the growing season. This practice creates a microbial vacuum that, counterintuitively, may encourage the proliferation of harmful fungi. The ongoing reliance on fungicides leads to pesticide resistance and is proving increasingly unsustainable as residues accumulate in soils and products, contributing to environmental degradation.

Compounding these issues is an economic model that promotes high yields for bulk wine exports. This drive for volume leads to denser canopies that retain moisture, which escalates the risk of fungal disease and, consequently, the need for more fungicide application. Such trends directly contradict an ecological approach to farming.

Fortunately, viable alternatives exist. Within the biodynamic community, innovative wine-growers in South Africa are pioneering non-chemical approaches to plant protection that foster diverse microflora, enhancing plant immunity naturally and organically rather than through elimination. This method leverages natural systems to combat diseases, promoting a probiotic form of farming where ecological principles take precedence over chemical solutions.

Outcomes from probiotic farming methods indicate that in regions such as Central Otago, where enhanced temperature variations reduce disease pressure, the viability of organic farming flourishes without the necessity for fungicide spraying. These observations challenge the prevailing mindset that prioritizes chemical treatments over sustainable growth practices.

The implications for New Zealand’s wine industry are substantial; transitioning to a probiotic approach could not only improve environmental practices but also create premium product opportunities for smaller wineries that draw value from place-based agriculture.

As the La Niña summer of 2025-2026 reminds us of the ramifications of an antimicrobial war, the need to rethink our farming strategies becomes crucial. Probiotic farming emphasizes local engagement and sustainable practices over superficial metrics dictated by conventional business models, urging producers to honor the intricate relationships between land, climate, and biodiversity.

The future hinges on our willingness to adapt, moving past incremental sustainability efforts toward a comprehensive re-evaluation of our agricultural practices. It is time for New Zealand’s wine industry to embrace this potential shift, ensuring resilience in the face of climate change and creating a foundation for future ecological and economic integrity.

About the Author: Chris Lehoux

Meet Chris Lehoux, an experienced wine connoisseur and dedicated blogger with a deep passion for all things wine-related. With years of expertise in the industry, Chris shares insightful wine reviews, valuable wine tasting tips, expert pairing advice, and captivating tales of vineyard visits. Join Chris on a journey through the world of wine, where every sip is an adventure waiting to be savored!