Articles
WINTER SURVIVAL, VARIATION IN BUD BURST AND FRUIT RIPENING, AND SOME YIELD COMPONENTS IN RASPBERRY CULTIVARS AND SELECTIONS
Cvs Glen Isla, Gradina, Glen Clova, ‘Malling’ Joy, Sirius and Spica were among those with most severe damage in both years of examination.
Several of the selections from an Agr.
Univ. of Norway breeding program were outstanding in regard to winter survival.
Early bud burst was recorded for Veten and several of the Norwegian selections, while Glen Moy, Malling Admiral, Preussen and ‘Malling’ Joy had late bud burst.
Length of expanded buds in spring did not show any significant correlation with winter damage.
Glen Clova, Glen Moy and some of the selections ripened very early, while ‘Malling’ Joy, ‘Malling’ Leo, Sirius, and to some extent Malling Admiral, could be characterized as late ripening cvs.
The selections showed about the same variation in time of ripening as the cvs.
Cvs Glen Moy, Veten, ‘Malling’ Leo and ‘Malling’ Joy, and the selections H 4–01–17, 410–08, 105–14 and 105–15 had large fruits.
The highest number of laterals per cane was recorded for the selection 105–54, but also Glen Clova and Preussen had a relatively high number of laterals. ‘Malling’ Joy had an unusual high number of fruits per lateral and per cane, and Gradina, Malling Admiral and some of the selections also were outstanding in this respect.
Potential yield values were estimated based upon multiplication of the mean fruit weight by the number of fruits per cane.
The highest figures were obtained for ‘Malling’ Joy, Gradina, Glen Isla, Malling Admiral, Malling Orion and Veten, and the selections 206–04, 105–54, 207–02, 410–08, P x (LGxMP), H 4–01–17, 105–14 and 402–13. The number of fruits was recorded early during the ripening season, however, and fruit loss due to fruit rot and winter damage and accelerated senescence and death of the fruiting canes was not recorded.