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Results of Canopy Management in Marquette and Frontenac: NNYGGA meeting Monday 28

NNYGGA Meeting

October 28, 6-8PM

Cornell Coop Extension Office

Watertown NY

Results of Marquette and Frontenac Training Trials

Thanks to Sue Maring for inviting me to speak at the NNYGGA meeting in Watertown on Monday, October 28.

We are in the second year of training system trials at Coyote Moon Vineyards in Clayton.  We are comparing 3 different training systems on both Marquette and Frontenac:

  • Vertical Shoot Positioning (VSP): Midwire cordon with catch wires, and additional canopy management, including shoot tipping (hedging), shoot thinning, and basal leaf removal. Intensive canopy management.
  • Top Wire Cordon (TWC):  High cordon established, and followup canopy management consisted in downward ‘shoot combing’ to open up the fruiting zone on top. Moderate canopy management.
  • Umbrella Kniffen (UK):  Vines pruned to a ‘head area’ with 3-4 long canes arched over the top wire and tied to the middle wire.  No additional canopy management was attempted. Minimal canopy management.

We adjusted bud number and shoot number  to a standard number in all the training systems.

This year we saw some dramatic differences in vine performance.  Highlights:

  • Marquette trained to VSP yielded about half of what the TWC and UK systems yielded.  Although the bud and shoot numbers were comparable, there were fewer clusters, fewer berries per cluster, and smaller berries.  Brix was higher on the lower-yielding VSP, but titratable acidity and pH were not, in spite of the great differences in crop load.
  • Frontenac yield was not different among the three training systems.  And the training system didn’t affect any of the maturity indicators (brix, pH, TA).  But separate sampling of ‘exposed’ and ‘shaded’ clusters across the training systems revealed that ‘exposed’ clusters had higher brix (1-2 degrees) and lower titratable acidity (2 g/liter lower) than did ‘shaded’ clusters.

I look forward to participating in the NNYGGA meeting, and will speak at 6:00 PM.

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