Mar 26, 2012Mature Apple Scab release escalates
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).
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.
Click here for charts showing mature apple scab release.