Orondis Opti Offers Double-Barreled Disease Protection
“Given the weather patterns we saw in 2016, I would’ve bet money that we would’ve picked up late blight,” says Zens, who is director of agronomy for CSS Farms and helps oversee 4,000 acres of chip potatoes near Dalhart, Texas. “But we stuck to our program and relied on Orondis Opti. We never saw late blight in the field.”
New to the retail market in 2016, Orondis Opti combines two fungicides, Orondis and Bravo®, into a double-barreled disease fighter that beats back late blight in potatoes and downy mildew in cucurbit vegetables. Offered as a multipack during its first year of use, Orondis Opti is now available as a premix formulation, starting with the 2017 season.
“It combines the best of both in one mixture,” says Kiran Shetty, technical development lead at Syngenta, North America. The latest active ingredient from Syngenta, Orondis’ oxathiapiprolin, makes for a dynamic pairing with Bravo’s chlorothalonil, a trusted performer. “Orondis fits into an already-established program.”
Oxathiapiprolin has a novel, single-site mode of action and is the only fungicide active ingredient in Fungicide Resistance Action Committee (FRAC) Group 49. Chlorothalonil is a multisite inhibitor with low-resistance risk.
“They work extremely well in concert,” Shetty says.
A Step Ahead
Although he battles a host of diseases at farms in different states, Zens had never encountered late blight in his Dalhart fields. CSS Farms had grown potatoes in the area for about 15 years and, due to the fields’ relative isolation, had managed to avoid late blight the entire time. That environment began to change in recent years, as new farms set up shop nearby.
In 2015, a neighboring potato farm attracted seedborne late blight. The disease also brushed the CSS crop, so Zens figured he would need additional protection in 2016. As the season rolled into production, Zens decided to trust Orondis Opti.
"New modes of action are critically important when fighting diseases. It was obvious from the start how powerful Orondis was."
“We did two applications of Orondis at the lower recommended rate,” Zens says, as part of a broader late-blight program. “We never picked up any disease in season, despite heavy pressure.”
Wilson Faircloth, a Syngenta agronomic service representative based in Leesburg, Georgia, credits much of the product’s success to oxathiapiprolin’s mode of action. He likens the concept to a human who takes the same antibiotics over and over again. Eventually, without new ways to tackle the problem, the medicine will become ineffective.
“New modes of action are critically important when fighting diseases,” says Faircloth, who works with growers who depend on healthy crops of cucumbers, peppers and squash to make a living. “It was obvious from the start how powerful Orondis was.”
The Perfect Fit
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With cucurbits, sprays can begin 10 to 14 days after transplant. In direct-seeded plants, Orondis Opti may be applied when two true leaves appear. Additional applications can be made one to two weeks later.
Orondis Opti fits into a broad-based program of other Syngenta products for tackling late blight, including Bravo Weather Stik®, Revus Top® and Omega® fungicides. After its stellar debut in 2016, Orondis Opti is definitely on many growers’ go-to lists.
“Last year, our first line of defense was Orondis Opti,” Zens says. “We were so impressed that we’re going with the same program in 2017.”
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