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Tree Physiology 18, 739-747

C.F. Scagel
Department of Botany and Plant Pathology
Oregon State University
Corvallis, OR 97331, USA

USDA-ARS
Horticultural Crops Research Laboratory
Corvallis, OR, 97330, USA

R. G. Linderman
USDA-ARS
Horticultural Crops Research Laboratory
Corvallis, OR, 97330, USA