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First Apple Scab Lesions Observed at the Penn State Fruit Research and Extension Center in Biglerville

Posted: April 17, 2012

As explained at the orchard twilight meeting last week, we expected and found the first scab lesions today on non-sprayed check trees of Delicious, Golden Delicious, Cortland and Stayman.
Dr. Noemi O. Halbrendt, Penn State Fruit Research and Extension Center Plant Pathology Associate

The high range (28,000) of ascospore release was reached at Penn State Fruit Research and Extension Center orchards and the peak of scab maturity is expected next week.

A chance of showers over the weekend, from Saturday, April 21, through Sunday, at temperatures in the mid-60s could again lead to scab infection periods (Fig. 1).