Sorry Bill, Degree days on what degree base?
Con In Michigan we have used approximately 284 DD42 from March 1 as the start point for king bloom on Macs. This is in our Michigan State University Fruit Management guide E-154, from a chart originally prepared by Phil Schwallier of MSU. This is based on pre-1990 weather data in the Grand Rapids area of Michigan. In recent years we have been getting more DD before March 1....so ignoring what happens before Mar 1 is now becoming problematic. So, I generally add on 25 DD42 to the total and use a target of 310 DD42 from January 1 as the start point for king bloom for Macs. Not sure if this works for your area. 1/2" green is approx 205 DD42 from March 1, or 230 DD42 from January 1 with my fudge factor. Bill Shane
