| Walnuts—California |
ReTain® Plant Growth Regulator Enhances Nut Set in Walnuts ReTain® Plant Growth Regulator ReTain Increases Yield in Multiple Walnut Cultivars
for California consistently increases nut set in walnut orchards that suffer from low nut set due to Pistillate Flower Abscission (PFA). Trials conducted since 2003 have demonstrated that ReTain consistently increases nut set in orchards with PFA. Applied at 5–30% bloom, a single application of ReTain reduces ethylene production in pistillate flowers, the main cause of PFA. This results in increased nut retention and higher yields.
8,000
6,828 +1,079
6,216 +1,218
5,749
6,000
5,245
4,998
+1,630
3,615
4,000
2,000
0
Chandler (15)
Serr (27)
Tulare (8)
Untreated
ReTain
Source: Valent and University cooperators
7000 A Second ReTain Application Further Protects Orchards from Severe PFA Recent research shows that making a second application at 40–60% bloom (typically 2–4 days after the first application) can significantly increase yields beyond the benefits of a single application. The following conditions most favor
using a second application: Orchards with historically high levels of PFA Periods of extended bloom in high PFA orchards Locations within orchards with historically high incidence of PFA, such as near pollenizers
6500
6000
5500
5000
4500
4000
Untreated
March 27 (1 pouch)
March 29 (1 pouch)
March 27 + March 29 (2 pouches total)
March 29 + March 31 (2 pouches total)
Source: Valent
How To Use Rate
1–2 pouches per acre (11.7–23.4 oz/A)
Timing
First application at 5–30% pistillate (female flower) bloom. If a second application is required, apply at 40–60% bloom.
Method
Ground or aerial application
Spray Volume
Ground: 100–200 GPA; aerial: 15 GPA minimum
Adjuvant
None
REI
12 hours
194
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