Agrimycin 100 to control bacterial rot?

I read this in an older book "The Iris Book" by Molly Price.
"...Certainly the percentage of bacterial rot has been reduced since I began to use Pfizer's agrimycin 100 several years ago. I mix the solution according to the highest concentration recommended in the directions on the bottle (4 tablespoons per 5 gallons of water) in a watering can, add a trace of detergent and drench the plants and surrounding soil. I have no regular program, but start in early spring and repeat during hot and humid periods in the summer."

Agrimycin is an antibiotic for cattle according to a Yahoo search. Things change over the years so you may want to check with USDA to see if it is approved for plant applications and/or if it is a controlled medication.