Question
I removed a fire blighted rose and replanted a new rose in the same spot.  It
now seems to have fire blight.  How can I treat the soil to prevent this?

Answer
Hi Kate

First of all, make sure it is fire blight.  The fire blight bacterium does not live in the soil, but is on leaf material from weeds and other plants such as pear or even bradford pear.  The disease is environmentally driven meaning that wind and rainfall are the main ways the bacterium is spread.  You can try treating the rose with a copper containing fungicide, which has activity against fungi and bacteria.   Hi-Yield brand Copper Fungicide is a good product.  Also, pick up any defoliated leaves as this is a source for further spread. Let me know if does not seem to be the problem and we can go in a different direction.  Good Luck.