2009 Apple Scab Infection Periods 6 Jul - 9 Aug* Penn State-FREC, Biglerville, PA
* Spectrum Weather Data Systems & Mills Apple Scab Disease Model. First mature ascospores on 3/31/09.
**Beginning of peak ascospore maturity 4/19/09. Found first leaf sysmptoms of scab on Red Del. on 5/4/09
End of primary as of 6/15/09. No more spore release as of 6/21/09
•Aug 10-12 forecast based on Skybit Ag E-Weather IPM Apple Disease Report. Scab infection predicted
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