Any new spray mix you come up with should be tested, before you spray whole trees.
Measure what would do just one quart of spray and use that on branches that you have marked. Take notes, including time of day, temperature, wind, and other weather. Look at sprayed and non-sprayed branches the next day, three-five days later, and 10 days later. If you don't see damage on flowers on the second check, then you are probably good to go with spraying the whole tree. It takes longer to have any chance of determining benefit, but first you want to be sure that you are not causing harm.
I have killed flowers, with several mixes that I tried. I was glad that it was just a few panicles.