This article was originally posted on June 10, 2016.
This week, our team finished our yearly treatment for fairy ring. Fairy ring is a persistent issue for growers, and we work very closely with researchers to find solutions.
“We start treatment at the roughneck stage,” says Matt Giberson, “and stop once we start seeing a lot of flower out there. It can be a little tricky; we don’t put on an application after a long frost night, or heavy rain, because too much water can stress the soil.” Treatments are planned very carefully. “Mike [Haines] and I go over the top producing bogs that aren’t marked for renovation, and set priorities. We start with Ben Lears first, because they bloom the fastest, and then go into the Stevens bogs. Once we’ve made the plan, we give Blondie, Alejandro, Tito, and Albert the maps and send them out. It takes two crews to get everything done, but they’re really hustling.”
A great deal of our knowledge comes from research being conducted by the Rutgers Marucci Center. Dr. Peter Oudemans has ongoing fairy ring experiments on some of Pine Island’s established beds. “What we’re doing with the experiment is looking at different treatments, especially different rates, to see which ones will control the disease best,” Peter says. “So on the one bog, we’re looking at one specific treatment, and we’re looking at different rates for the treatment and different rates of water. Because the fungus is in the organic layers beneath the sand, we need to figure out how much it takes to move the applications to the right position. We did some studies to look at how much water will it take to get to the correct depth, and what we found out is that .2 gallons per square foot is probably the minimum that we can use. Which is kind of what we found from our soil moisture probes as well. We’re starting to see some control at those levels.” The other bog, he says, is being used to test other treatments. However, he says, “we’re looking at two problems. First: how do you measure success? Because those plots are big and hard to evaluate. So we’re using drones to evaluate the progress. We measure once a month, to see if there’s any change in amount. It’s been pretty useful to measure it that way; we can capture data in fifteen minutes, evaluate progress over time, and capture it through the summer.”
“The other problem is, what can we expect from fairy ring control?” he says. “Fairy ring already messes up the canopy. It kills the edge, but then it leaves the center as a scar on the bed and also reduces yield. But talking with Dan [Schiffhauer] and Joan [Davenport], we came up with some possible treatments for the centers of those rings to help them recover and help with the scarring, such as slow release fertilizers.”
Fairy ring has been a persistent problem in the local cranberry industry for a long time, and it’s been tricky to address, even with all the hard work from researchers. Manager Mike Haines remembers tracking in in 2008 during his summers home from college. “The best thing is not having to deal with it in the first place,” he says. “That’s a huge focus when we assign a bog for renovation. A lot of the time, the beds you’re renovating are the old ones being torn up by fairy ring, so you don’t want that problem to recur. You want to do it all right from the beginning. Attention to detail in renovation and thinking about it thoroughly and critically are important so you can avoid having to do all this stuff later.”