1. Faculty of Science and Technology; Free University of Bozen-Bolzano; Bolzano Italy
2. Tree Fruit Research Laboratory; Agricultural Research Service, USDA; Wenatchee WA USA
3. Instituto de Producción y Sanidad Vegetal, Facultad de Ciencias Agrarias; Universidad Austral de Chile; Valdivia Chile
4. Yakima Agricultural Research Laboratory; Agricultural Research Service, USDA; Wapato WA USA