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Can. J. For. Res. 30: 1887-1787 (2000)

C.F. Scagel
USDA Agricultural Research Service
Horticultural Crops Research Laboratory
Corvallis, OR 97330, U.S.A.

R.G. Linderman
USDA Agricultural Research Service
Horticultural Crops Research Laboratory
Corvallis, OR 97330, U.S.A.

R.K. Scagel
Pacific Phytometric Consultants
Surrey, BC, V4A, 6A5, Canada