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Mature Apple Scab Ascospore Release Escalates

Posted: March 23, 2012

The release of mature apple scab ascospores at Penn State Fruit Research and Extension Center in Biglerville, PA approached 18,000 on March 22nd, just 72 hours after we first detected mature ascospores (Monday, March 19th).
Dr. Noemi Halbrendt, Penn State Fruit Research and Extension Center, Plant Pathology Associate

In a normal year, these numbers are typically observed in late April to early May. Eight  scab infection periods occurred  from March 16 to 22,  including 8 continuous days of wetting that accumulated 132  leaf wetness  hours.  

Growers are advised to carefully follow the recommendations presented at the Special Workshop on Managing Apple Scab in the Age of Multiple Fungicide Resistance.