EFFECT OF CHEMICAL REMOVAL OF PRIMOCANES ON SEVERAL RASPBERRY* CULTIVARS

Research was begun in 1981 on a 4-year old raspberry planting to determine recommendations for primocane removal as a labor-saving method, using 2-sec-butyl-4, 6-dinitrophenol, for the newer Pacific Northwest cultivars (Chilcotin, Haida, Meeker, Nootka, Skeena) in comparison with the long established cultivar Willamette.
In 1981 all plots received one application of chemical when the primocanes averaged 15 cm in height.
In 1982, 1983 and 1984 both single and multiple follow-up treatments were applied to all plots which had only one application in 1981.

Cultivars responded differently to treatments when replacement canes and yield were considered.
All treatments resulted in increased yield for all cultivars.
Greatest yield effects were recorded for Skeena probably due to reduced incidence of cane disease.
The results show that recommendations for chemical removal of primocanes should be developed for specific cultivars or cultivar growing habits.

IV International Rubus and Ribes Symposium

JACK A. FREEMAN, HUGH A. DAUBENY

https://doi.org/10.17660/ActaHortic.1986.183.31