I have some Kiowa Blackberries that only make decent berries about every third year and are weak on the priomocane. I want to replace them with another variety I have. Was thinking of cutting off the primocanes and spraying cut cane with glyphosate. Will that keep additional primocanes from coming up?
No, glyphosate only affect the leaves and green stems they touch. They’ll just resprout again with glyphosate. 2,4-d will knock out the roots too if your wanting to kill the old root system, but at the same time blackberries are pretty resistant to 2,4-d, so might need to give them a second good spraying to kill the old plants root suckers.
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I wouldn’t spray. I have great success with painting undiluted glyphosate directly on freshly cut stumps/stems. Spraying gets too little on the plant you’re trying to kill, (since the stumps are small relative to a full leaf canopy)
I’ve used this technique on everything from orchard grass and asters to mulberry trees and honeysuckle. Also great against canadian thistle. Chopped stuff doesn’t resprout, and zero damage to whatever is surrounding it.