Why do Sweet Cherries Crack?
A number of factors have been implicated as contributors to cherry rain cracking. These factors may include: rapid uptake of rain water absorbed through the fruit surface, rapid change in water status of the whole tree and high relative humidity.
The natural barrier to water uptake is the fruit’s cuticle. As cherries grow, the fruit skin becomes progressively thinner while the number and size of micro-cracks on the cuticle increase. The development of micro-cracks in the cuticle during rapid fruit expansion in stage III (“final swell”) has been reported as a crucial factor in cherry cracking susceptibility.
Multiple applications of RainGard have been shown to increase the integrity of the cherry cuticle and reduce susceptibility to cracking during rain events.
How to Use
For best performance, use RainGard in a 3-application program.
Timing Make first application 4 weeks prior to estimated harvest date or when cherries
reach straw color stage. Re-apply every 7-10 days until harvest.
Spray Volume 100 to 200 gal/a (900 to 1800 L/ha)
Adjuvant Not recommended
Tank Mix May be applied with ProGibb Plant Growth Regulator
Maximizing RainGard Efficacy
• Apply a conditioning spray followed by a second application prior to rain
• Allow RainGard to dry for at least 2 hours prior to rain
• Spray fruit thoroughly to ensure adequate coverage
• Allow 24 hours before reapplication