As apple growers continue to navigate tighter labor windows & availability, unpredictable weather patterns, and increasing quality expectations from buyers, harvesting highly marketable fruit has never been more important—or more complex. ReTain® Plant Growth Regulator Soluble Powder from Valent U.S.A. has become a cornerstone tool for managing these challenges by working directly with plant physiology to optimize harvest timing and fruit quality.

Powered by AVG (aminoethoxyvinylglycine), ReTain temporarily inhibits ethylene production—the hormone responsible for ripening and fruit drop—giving growers a powerful tool to “slow the clock” on maturation.

Below, we break down the three primary pre-harvest benefits of ReTain and how they translate into real-world advantages in the orchard and beyond.

1. Extended Harvest Window & Superior Harvest Management

One of the most impactful benefits of ReTain is its ability to extend the harvest window by up to four weeks, providing critical flexibility for growers.

By delaying ethylene production, ReTain slows fruit maturation and allows apples to remain on the tree longer without compromising quality. This creates several operational advantages:

• Better labor management: Harvest can be spread across more days or weeks, easing labor constraints
• Reduced “crunch time” pressure: Crews can pick fruit at optimal maturity rather than rushing
• Improved scheduling flexibility: Growers can align harvest with weather and market conditions

This flexibility allows growers to run harvest on their schedule, rather than being dictated by rapid ripening or fruit drop pressure.

For multi-pick varieties like Gala or Honeycrisp, targeted applications (7–14 days before harvest) help maintain quality in later picks without disrupting the first harvest, further enhancing management precision.

2. Proven Drop Control to Protect Yield and Enhance Fruit Quality

Pre-harvest fruit drop is one of the most significant risks to yield and profitability. As apples mature, ethylene triggers stem loosening, leading to fruit drop—often at the worst possible time. ReTain directly addresses this challenge by inhibiting ethylene biosynthesis, effectively reducing fruit drop and keeping apples securely on the tree until the ideal harvest window.

Key outcomes of ReTain drop control:

• Higher marketable yield by preventing premature fruit loss
• More time for fruit sizing, since apples continue to grow while hanging on the tree
• Reduced risk during adverse weather (wind, heat, or storms) prior to harvest

Because fruit remains attached longer, growers can capture additional size and weight—important drivers of packout value and returns. From a practical standpoint, ReTain transforms drop control from a reactive strategy into a proactive yield protection tool, ensuring that more fruit makes it from orchard to bin.

3. Maintaining Quality in Long-Term Storage

Beyond harvest timing and yield protection, ReTain helps to maintain fruit quality in controlled atmosphere storage.

By slowing the ripening process, ReTain helps maintain key quality attributes:

• Improved firmness at harvest and during storage
• Reduced physiological disorders such as watercore, stem bowl cracking, internal browning, and greasiness
• More uniform maturity and ripening across the block

This is particularly valuable for growers targeting long-term storage programs. ReTain-treated fruit enters storage in better condition and maintains quality longer, resulting in:

• Higher packout rates
• Improved marketability months after harvest
• Better response to post-harvest tools like 1-MCP

Additionally, flexible use strategies—such as 7-day applications for hard-to-color varieties—allow growers to fine-tune maturity management without sacrificing color development or finish quality.

The result: premium fruit that performs from harvest through storage to retail.

Bringing It All Together

ReTain isn’t just a stop-drop product—it’s a comprehensive harvest management tool that helps growers optimize every stage of the harvest window.

The Three Core Pre-Harvest Benefits:

1. Extended harvest window → Greater flexibility and labor efficiency
2. Reliable drop control → Protected yield and increased returns
3. Post-Harvest benefits → Maintain post-harvest fruit quality and reduce physiological disorders in storage

Together, these benefits enable growers to maximize both operational efficiency and crop value in a well-timed application program.

Final Thought

In today’s apple production environment, success depends on precision—timing, quality, and market readiness. ReTain empowers growers with the ability to manage all three by controlling the underlying driver of ripening: ethylene.

By integrating ReTain into your pre-harvest program, you’re not just delaying maturity—you’re unlocking the full potential of your crop.

To learn more, contact your retailer or Valent representative or visit Valent.com/ReTain.

Always read and follow label instructions.

ReTain is a registered trademark of Sumitomo Biorational Company LLC.