The Environmental Protection Agency has registered Luna fungicide from Bayer CropScience of Research Triangle Park, N.C.
Registration in California should occur "shortly," says Herb Young, senior product manager, horticulture fungicides.
He wouldn't venture to guess when New York would register the fungicide.
As part of a resistance-management strategy, Luna will only be sold as part of a premix, Young says.
The premixes for the horticultural sector are Luna Experience, Luna Tranquility, and Luna Sensation.
Luna contains the active ingredient, fluopyram, a pyramide. It belongs to the Fungicide Resistance Action Committee’s Group 7.
Although Luna is an SDHI—(Succinate Dehydrogenase Inhibitor)—Young says it doesn’t have cross-resistance to other SDHIs, such as boscalid.
In most cases, resistance occurs when an organism mutates, and the single site where the fungicide was active changes shape slightly.
The fungicide molecule that used to fit nicely into the site no longer fits.
Luna is the only member of the pyramide division within Group 7. Boscalid and the other products are carboxamides within Group 7.
"We have a different shape," Young says. "We're a long, slender molecule. They're a big blocky three-dimensional molecule. Luna is three consecutive flexible bands, so it can twist and turn into multiple shapes."
Luna Experience, a mixture of Luna and Elite, will be for use on winegrapes, almonds, pistachios and watermelon.
In winegrapes, it's effective against powdery mildew.
It also targets gummy stem blight on watermelon and cucurbit powdery mildew.
Alternaria in an increasing number of almond and pistachio orchards are growing resistant to either boscalid or strobilurins.
That's why Bayer decided to register both Luna Sensation and Luna Experience for those nut crops, so growers have a choice, Young says.
Luna Tranquility, a mix of Luna and Scala, is registered for potatoes. It is effective against white mold, early blight, Botrytis and black dot. It can be applied via chemigation.
Luna Sensation, a mix of Luna and the strobilurin Flint, is labeled for use on apples, cherries, almonds and pistachios.
In apples, it targets scab; in cherries, monolinia fruit rot.
Michigan State University has identified apple scab that's resistant to strobilurins.
Researchers in the Northeast also have documented the problem.
In response, Young says Bayer is pursuing a registration for Luna Tranquility, which contains Scala, for apple scab.
With all three products, Bayer has resistance-mamangement recommendations on the label.
Although they vary slightly from crop to crop, Young says the labels allow only two consecutive applications of a LUna product before rotating to a product that is not a FRAC Group 7.
In addition, no more than half of the fungicide applications during a season should involve a Luna product.