Volume 49 Number 1 Article 10
Year 1995 Month 1
Title: Cold Hardiness in Rubus
Authors: K. Hummer, L.H. Fuchigami, V. Peters and N. Bell
Abstract:
More than 80 raspberry and 42 blackberry
genotypes were evaluated for cold hardiness
after controlled laboratory freezing in January
1990. Red, yellow, black, and purple raspberry
cultivars (R. idaeus L., R. neglectus Peck), blackberry cultivars (R. allegheniensis Porter, R.
ursinus Cham & Schldl.) and other Rubus species
selections were examined.
T50's, the temperatures where 50% of the samples were killed,
were calculated for cane (cambial region), bud
and bud base of each genotype.
Red, purple,
and black raspberries had a lower T50 values
than did blackberries.
The T50 value of Rubus
idaeus L. cv.
Burnetholm canes was -34C. Hardy
summer bearing red raspberries, 'Canby' and
'Puyallup* had a T50 value of -30C; 'Canby' buds
-26C; Puyallup -20C. The T50 values of fall
fruiting red raspberries, such as 'Zeva Remontante,'
Indian Summer^ 'St.
Regis,' and 'Fallred,'
ranged from -23 to -25C. Several purple raspberries (Rubus neglectus Peck cvs.
Brandywine,
Royalty) were quite cane hardy, with T50 values
lower than -33U. The buds and bud bases of
these purple raspberries, however, had T50 values
at most -25C. Canes of several black raspberries
(R. occidentalism L. cvs.
New Logan, Bristol) had
T50 values of -28C; buds -27C and -17C, respec
tively. 'Bristol' offspring had T50 values as much
as 15C less than the parent.
Canes of the hardiest
blackberry cultivar, (R. sp. cv.
Black Satin) had
a T50 value of -23C; buds were -19C. In many
raspberry and some species genotypes exam
ined, the region of the bud at the axis at the
cane was less hardy than were tissues within the
bud scales.
The T50 values of canes of most
cultivars ranged from about 2 to 15 degrees
hardier than buds.
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