The affected plant (with others) has been under drought for sometimes and planted on re-used soil. Could these have any connections to the disease?
Pakop Sovo
The 2 likely diseases of cassava are necrosis and anthracnose (the canker, like you called it). And from the close-up view, I would go with your diagnosis (the latter).
Regarding the possible mode of transmission, the anthracnose disease is a fungal one, and is air-borne. The existence of infected stems or leaves is enough to spread the fungal spores, irrespective of whether the infected vegetative part is dead or not. Infected soil could as well be threatening. In your case, wind could have spread the disease during the drought season, if your soil is innocent.
I recommend you completely eradicate (destroy by burning) old/infected stems, and practice shifting cultivation; bearing in mind that the same fungal spp. can attack other crops like paw-paw and pepper.
Kind regards
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