What Is This Problem, At The Base Of My Autumn Raspberry Canes?

Question

‘ looks like some sort of canker… at soil level and bottom of cane..

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Answer 1

This looks to be crown gall, unfortunately. The plant needs to be destroyed and all remains removed from the area. This will be permanent as long as the plant is there. Eventually the plant will die, anyway.

https://www.gardeningknowhow.com/plant-problems/disease/how-to-fix-crown-gall.htm

You can visit your nearest horticultural extension or similar for your country for a second opinion, but this is a direct identifier for the disease.

Should you decide to keep the plant, then you might try any product that contains Rhizobium radiobacter. It might prolong the plant's life and control some of the symptoms.

This article may help:

https://www.gardeningknowhow.com/plant-problems/disease/how-to-fix-crown-gall.htm