Treating fire blight with chemjet/streptomycin

So I’ve had a fire blight issue this year and have had to pull 5 trees which is 1/6 of my 2 yr old orchard.

Recently I came across this chemjet product it’s 2mm plastic tip spring loaded tree injector. It’s imported from Australia I believe. Here’s one site that sells it. https://chemjettreeinjector.com/

I bought some of the Fertilome powered streptomycin and am trying this on a Holstein Pippin tree on g.890 I planted in 2023 and have already cut it back substantially without apparently getting all of the fire blight.

Has anyone tried this or anything similar?

I’m somewhat reluctant to let this go too long without cutting the tree back again because it seemed to progress very rapidly in July.

Probably should add I’m in Minnesota and we’ve had near record rainfall since spring so that’s not helping.