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| Hi Don,
There are plenty of general WW GDD charts available, one is attached (no source listed). This one suggests 1350 GDD (base 32F in this example, some use 41.9F/5.5C remember) are required from germination to jointing (Z31).
When you ask about frost damage, are you talking leaf injury (or potential plant death over the winter as a result of sub zero temps), or spring freeze damage potential in the spring (after jointing)? These are all considered "frost damage" depending on who asks.
Phil N
http://www.needhamag.com
Visit our new wheat management discussion group at http://www.wheatworld.net
Edited by Phil N 10/13/2011 11:08
 (Wheat Estimated GDD Chart.jpg)
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 Wheat Estimated GDD Chart.jpg (40KB - 225 downloads)
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Winter wheat tillering and phyllochron units?
