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Apple Thinning Carbohydrate Models for June 2

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Posted: June 2, 2014

Central PA experienced a cloudless sunny weekend and the fruit grew fast. Most sites in the report show a minor deficit of carbohydrate balance which should aid in removing fruit.

The largest fruit have moved into the 17 to 18 mm range with Idared at 21 mm. Fruit set looks heavy on Gala, Fuji and Jonagold. Set is lighter on McIntosh and Honeycrisp. Weather outlook for this week shows scattered thundershowers possible Tuesday and Thursday and mostly cloudy for Wednesday. Most sites in the report show a minor deficit of carbohydrate balance which should aid in removing fruit. Current average fruit size for the largest fruit by cultivar at Rock Springs is:  Jonagold – 18.5, Fuji – 17.3, Honeycrisp – 18.4, McIntosh – 17.5, Idared – 21.0. There is a wide spread in fruit size on the trees. We seem to be into the beginning of June drop although some fruit still seem to be sticking. If pedicels are turning yellow those fruit should be dropping this week.

For those of you in the Northeastern portion of the state we have added a new cooperator to the NEWA network. Jenn Robo of Robo Family Farm installed a Rainwise weather system late last week at their farm in Scott Township in Lackawanna county. You can find the weather for that region on the NEWA map on their home page.