Grapevine Berry Inner Necrosis Virus: A Growing Concern for Australian Grape Growers
The discovery of Grapevine Berry Inner Necrosis Virus (GINV) in Australia has sparked concern among grape growers, with the virus potentially causing significant damage to the country's wine grape industry. This article delves into the implications of this detection, exploring the virus's impact, the challenges of managing it, and the concerns raised by growers.
A Hidden Threat
GINV, a virus that can restrict growth, delay budburst, alter leaf color, and reduce grape quality, has been detected in Victoria, Queensland, and South Australia's Riverland. What makes this discovery particularly concerning is the virus's potential to spread to various grape varieties, including wine grapes, rootstocks, and dried grape types. However, it has only been found in table grapes so far.
Adam Knoll, a table grape producer, noticed symptoms of the disease about five years ago, but it took international collaboration and testing to confirm the presence of GINV. This highlights the virus's ability to go unnoticed for extended periods, as infected vines can be asymptomatic.
The Impact on Grape Quality and Yield
The impact of GINV on grape quality and yield is a significant concern. While the virus's effects on wine grape fruit quality and yield are still unknown, it could have a devastating impact on susceptible table grape varieties. Knoll estimates a 90% yield reduction in infected vines, potentially resulting in hundreds of millions of dollars in losses for the industry.
Challenges in Management and Eradication
Managing GINV is challenging due to the lack of a known cure. Eradication is not possible, and the virus can be transmitted through infected propagation material, such as cuttings or grafts, as well as Erineum mites. This makes it difficult to control the spread, especially since asymptomatic vines can contribute to the virus's dissemination.
Delayed Information and Growing Concerns
The delay in providing information to growers has raised concerns. Ian McRae, a member of the Riverland Vine Improvement Committee, expressed frustration over the lack of timely communication. Growers are now grappling with uncertainty about the virus's spread and the potential impact on their businesses.
Conclusion: A Call for Action
The detection of GINV in Australia serves as a stark reminder of the ongoing threat posed by plant diseases. As the industry grapples with the challenges of managing this virus, it is crucial to prioritize proactive measures. This includes enhancing biosecurity practices, investing in research to better understand the virus, and ensuring timely communication to mitigate the potential economic impact on grape growers across the country.
