GROWING DEGREE DAY ACCUMULATIONS as of May 10, 2004 at the NWMHRS
Degree day accumulations in NW MI have slowed and are now behind the past 14 year average. Rainfall this week was quite varied, but generally was less than the rest of the lower peninsula. Disease pressure has also varied a great deal this past week.
GROWTH STAGES at NWMHRS (5/3/04)
Apple – Red delicious:
Sweet cherries: Early to mid-season bloom varieties are in full bloom at the NWMHRS; bloom has not yet begun in the coolest areas of NW MI. Conditions for brown rot blossom blight have been favorable in areas where bloom has been present. Temperatures have not been favorable for pollination this past week.
Tart cherries: Bud damage from the May 3rd freeze is most prevalent in the southern-most area of NW MI. Most of NW MI had a cloud cover that kept temperatures above damaging levels. Crop potential remains good for NW MI. Danube, an early blooming tart cherry, is just beginning to bloom at the NWMHRS.
Apples: An apple scab infection period occurred during the past couple of days in some areas of NW MI, but not in other areas. Rosy apple aphid hatch is beginning.
Plums: Many Japanese varieties are in bloom at the NWMHRS; most European varieties are not yet blooming.
Correction to the 2004 Michigan Fruit Management Guide (Spray Calendar)
Flint is listed as an option during bloom on sweets and tarts, but the label limits its use to petal fall and beyond. Therefore, Flint is not an option for bloom application.
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