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Ginseng growers know Phytophthora root rot well. Visuals of drooping plants on the shoulders of beds, wet, spongy roots and that hard-to-forget vinegar smell linger are hard to forget. 

What is a tool to help battle this tough disease? 

By this time you are familiar with the fact that Orondis^® Gold fungicide harnesses the novel mode of action of oxathiapiprolin (Group 49), combined with metalaxyl-M to protect roots. In 2025, the brand changes to Orondis® Gold DC, but it still offers the same amount of potent protection (active ingredients) per acre.   

To maximize the use of this tool, keep in mind the "what", "when", and "how" when applying.  
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Preventative use is key to successful management of water moulds like P. capsici and Pythium spp., so for soil applications, use Orondis Gold DC early in the season.  

How does Orondis Gold DC work? 

Physical and chemical properties 

• When applied as a drench, soil spray, or through irrigation, the two active ingredients, oxathiapiprolin and metalaxyl-M, move into the roots within two weeks. 

Source: Internal Syngenta research (Jealotts Hill, UK, 2016). Images taken 7 days after treatment and daily watering. 

• Oxathiapiprolin has low water solubility – this means Orondis Gold sticks and stays in the application zone, providing long-lasting protection against root rot. This also means it’s important to put the product where you need it to be through application placement or supplemental irrigation.
• Metalaxyl-M redistributes across the surface and percolates down to the root zone, complementing the movement of oxathiapiprolin and providing optimal coverage of the root zone. 

Biological mode of action 

• Orondis Gold is most active against the early stages of pathogen life cycles and will stop spore germination and inhibit mycelial growth in the roots.  
• Orondis Gold is effective against Phytophthora root rot and manages populations that are insensitive to metalaxyl-M. 
• The oxathiapiprolin component of Orondis Gold disrupts the flow of lipids between cells and membranes, causing them to drown in their own fat. 
• The oxathiapiprolin component has limited or no activity against Pythium spp. 

The champion of Phytopthora root protection 


Source: External replicated greenhouse study conducted in MI (Hausbeck, MSU), 2010, n=1. Orondis^® Gold DC is formulated to deliver an application rate of Orondis® between 0.28 to 0.56 L/a. Trial was inoculated with Phytophthora cactorum).

How to use Orondis Gold DC?

As mentioned above, proper application is key to getting the product down to where you need protection. Because Phytophthora is high risk for resistance, it is critical to rotate chemistry when targeting this disease. Orondis Gold DC should only be used to a maximum of 3 times during the season, rotating with products that do not contain Group 4 or 49 products. Some Syngenta rotation options include: Allegro^® fungicide (group 29) or Revus^® fungicide (group 40). 

For more information contact our Customer Interaction Centre at 1-87-SYNGENTA (1-877-964-3682). 
 
Performance evaluations are based on internal trials, field observations and/or public information. Data from multiple locations and years should be consulted whenever possible. Individual results may vary depending on local growing, soil, and weather conditions. Always read and follow label directions. Trademarks are property of their respective owners. Please check with your exporter when using any Syngenta product on ginseng destined for use outside of Canada

Always read and follow label directions. Orondis^®, Ridomil Gold^® , Revus^® and the Syngenta logo are trademarks of a Syngenta Group Company. Allegro^® is a trademark of ISK Biosciences Corporation.