Devon,
United Kingdom 
Help - my apple tree has fire blight - I have been told that I should use liquid copper spray but been unable to source it - can anyone help or recommend a different spray?
26 Jun, 2019
Answers
According to the rhs there is no chemical control for it.
this is the link for the rhs site. it shows the symptoms too.
https://www.rhs.org.uk/Advice/profile?PID=160
26 Jun, 2019
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The gardenfocused website may be helpful:
https://www.gardenfocused.co.uk/fruitarticles/pest-disease/fireblight.php
26 Jun, 2019