Red raspberry cultivars that produce fruit on current season canes (primocanes) can produce additional fruit the following year on floricanes. The primocane-fruiting raspberries ‘Himbo Top’, ‘Joan J’, and ‘Polka’ were grown organically in high tunnels and pruned to different floricane densities to determine the effects on fruit yield (primocane, floricane, total) and harvest times. Floricane densities were 0, 2.4, or 4.8 canes per meter of row length in 2015, and 0, 4.9, or 9.8 canes per meter in 2016 and 2017. Total yield (floricane plus primocane) was significantly greater with low floricane density (17 t·ha−1) or high density (19 t·ha−1) compared with no floricanes (12 t·ha−1). Floricane density did not affect primocane yield or harvest times. Primocanes of ‘Polka’ were taller when floricanes were present, but primocanes of other cultivars were unaffected. Results indicate that producing fruit on both primocanes and floricanes (double cropping) can improve sustainable overall yields.
This project was funded in part by support from Michigan State University AgBioResearch, National Institute of Food and Agriculture Hatch Project MICL02483, the National Institute of Food and Agriculture (NIFA) U.S. Department of Agriculture Specialty Crops Research Initiative program (Agreement 2014-51181-22380), and grants from the Michigan State Horticulture Society and the North American Raspberry and Blackberry Growers Association.
SønstebyA.RoosU.HeideO.2018Effects of biennial cropping and controlled shoot density on yield performance and fruit quality in red raspberry (Rubus idaeus L.)J. Hortic. Sci. Biotechnol.doi: 10.1080/14620316.2018.1478678
Sønsteby,A.Roos,U.Heide,O.2018Effects of biennial cropping and controlled shoot density on yield performance and fruit quality in red raspberry (Rubus idaeus L.)doi: 10.1080/14620316.2018.1478678)| false