Grape phenology and GDD accumulation

GDD base 50 accumulated since April 1 = 1915
http://agebb.missouri.edu/weather/reports/gddTable.asp

Phenology stages according to the Modified E-L system
http://door.uwex.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf

Chambourcin is changing color.

 

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One Response to Grape phenology and GDD accumulation

  1. Steve Speise says:

    Thank you for these weekly updates. I have 10 Norton grape vines and know next to nothing, so the weekly photo with the stage has helped me understand what is happening. With my first real harvest coming up, I will be even more interested. Although I am nearly 2 degrees latitude north, your additional 400 feet of elevation, makes the timing close.
    Thanks again.
    Steve

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