Fire Blight and Copper Sulfate

Question

I understand a copper sulfate solution is effective against fire blight. I have about one pound of copper sulfate crystals (blue). I don’t need hundreds or thousands of gallons of the mix to treat my three pear trees. How much in grams or ounces should I use per gallon (or 5 gallon) to make the mix? I have an electronic scale that measures 0. 0 oz. I assume the answer you’ll give me is by weight. . . . yes?

Answer 1

At its lowest rate, use approximately 9 grams of copper sulfate per gallon of water.