Precision Field Sorting: Reduce Harvest MOG Without Slowing the Pick

The Hidden Cost of Harvest MOG

Vineyard managers consistently face the challenge of Material Other than Grapes (MOG) during harvest. This problem isn't just an aesthetic nuisance; it carries significant operational and quality costs. High MOG percentages at the weigh station translate directly into increased labor for sorting at the winery, slower processing lines, and potential for off-flavors from stems, leaves, or moldy berries. Ultimately, this can compromise overall wine quality, diminish market value, and delay critical fermentation timelines, impacting your bottom line without immediate visibility.

Precision Field Sorting: A Proactive Approach

The most effective strategy to reduce MOG without compromising picking speed is to empower the harvest crew with clear, consistent guidelines and simple tools for immediate, precision field sorting. This shifts the initial MOG removal from the winery intake to the vineyard floor, where it can be handled efficiently and prevent contamination of clean fruit.

Essential Tools and Specifications

Equipping your crew with the right tools and clear MOG disposal protocols is paramount:

• Dedicated MOG Bins: Place small, easily identifiable bins (e.g. bright orange 5-gallon buckets) at regular intervals along picking rows, ideally every 25-30 feet. These are exclusively for MOG.
• Quality Hand Shears: Provide sharp, ergonomic hand shears for each picker. This allows for precise cluster removal and rapid trimming of undesirable elements.
• Visual Aids: Implement laminated cards with clear images of acceptable vs. unacceptable clusters/elements. These should be reviewed during training and available for reference.

Step-by-Step Crew Training and Execution

Effective training and consistent supervision are non-negotiable for success.

1. Pre-Harvest Training Session (Mandatory)

1. Define MOG: Conduct a hands-on session before harvest begins. Clearly demonstrate what constitutes MOG (e.g. green leaves, detached shoots, dried tendrils, mummified berries, moldy clusters, insect nests).
2. Set Thresholds: Specify actionable thresholds. For example, instruct pickers to remove any cluster with more than 10% shriveled or moldy berries. Any cluster exhibiting mold patches exceeding 1 cm in diameter must be discarded.
3. Tool Usage & Safety: Train on the safe and efficient use of hand shears. Emphasize proper hydration and sun protection.
4. MOG Disposal Protocol: Clearly demonstrate how and where to deposit MOG (into dedicated MOG bins, not on the ground near vines or in picking bins).

2. In-Field Execution and Supervision

1. Consistent Communication: Supervisors must regularly walk the rows, providing immediate feedback and reinforcing training. Use the visual aids as teaching tools.
2. Strategic Bin Placement: Ensure MOG bins are always within easy reach (e.g. no more than 10-15 feet from the picker's current position) to minimize time spent walking to dispose of MOG.
3. MOG Bin Management: Designate a crew member to regularly empty MOG bins into larger collection points, ensuring they never overflow and slow down pickers.
4. Random Spot Checks: Supervisors should conduct random checks of picking bins for MOG content. A quick visual inspection of 5-10 clusters per bin can identify issues early.

Consistent, hands-on training coupled with immediate feedback can potentially reduce MOG at intake by an estimated 50-70%.

Troubleshooting Guide

• High MOG in Picking Bins: Immediately re-train the affected picker(s). Assign a supervisor to work alongside them for a short period, providing direct guidance.
• Slow Picking Due to Sorting: Re-evaluate MOG bin placement. Ensure pickers understand that rapid identification and swift disposal into MOG bins is key, not meticulous cluster-by-cluster cleaning. The goal is to remove obvious MOG quickly.

Example Scenario

A vineyard manager implements this training for a Cabernet Sauvignon block. Historically, this block yielded 3% MOG at the crusher. After a 45-minute pre-harvest training session and consistent in-field supervision with MOG bins placed every 25 feet, the MOG content observed at the winery intake for the first day of picking drops to an estimated 0.8%. This reduction significantly decreases the winery's sorting labor by an estimated 2-3 hours per shift.

Common Mistakes and Consequences

Immediate Actions for Implementation

To implement this strategy effectively, consider these immediate steps:

1. Procure Equipment: Order sufficient small MOG bins and quality hand shears for your entire harvest crew within the next 24 hours.
2. Develop Training Materials: Create clear, visual training aids (laminated cards) defining MOG types and acceptable thresholds by the end of the week.
3. Schedule Training: Plan a mandatory, hands-on training session for all harvest personnel before picking commences. Allocate at least 30-45 minutes.
4. Establish Supervision Protocol: Outline clear roles for supervisors regarding MOG checks, feedback, and MOG bin management.

Implementation Timeline: Initiate procurement and material development within 1-2 days. Conduct training 1-2 days prior to harvest. Maintain daily supervision throughout harvest. Success Metrics: Monitor MOG percentages at the weigh station or crusher. Aim for a consistent MOG level below 0.5-1% of total tonnage. Vineyard managers can track these metrics and crew performance using vineyard management software like VinoBloc, enabling data-driven adjustments.