The walnut harvest is under way in California, and growers are thinking about one thing: Am I happy with my yield?
If their orchards suffer from pistillate flower abscission (PFA), the answer is: Probably not.
PFA causes low nut set, which can then lead to a subpar yield. Orchards with high year-to-year yield variability, lower production near pollinizer rows, few double and triple clusters and yields below county average for their variety may have a PFA problem.
But PFA need not gain the upper hand on walnut growers. Applications of ReTain® Plant Growth Regulator consistently increase yield in walnut orchards that suffer from low nut set due to PFA.
While an application of ReTainat 5 to 30 percent bloom can mitigate the effects of PFA and increase crop yield, new research shows that a second application at 40 to 60 percent bloom (typically 2 - 4 days after the first application) can significantly increase yields beyond the benefit of a single application.
If your yields aren’t where you want them to be, ReTain is a good option to make it happen. In a recent trial where ReTain was applied twice to a Serr orchard, the cooperating grower realized a 21.5 percent yield increase from the first application to the second.
In nature, pistillate flowers emerge from terminal buds of walnut trees and generally set one to two flowers that go on to become the nuts. With ReTain, you can get three and sometimes four flowers to set. This year we’re seeing many triples and quadruples in areas treated with ReTain. That can make a major difference to the bottom line when the season’s final numbers are tallied.
To learn more about ReTain and the rest of Valent’s portfolio of tree nut products, visit www.valent.com.