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2 teaspoons per gallon of water, 3 teaspoons is a strong mix.
I mix a gallon at a time and use a hand sprayer. One quart will cover both sides of about 30 deep frames. Just need to get a good mist into the bottom of the cells, let it air dry before stacking up to prevent mold. Mix only what you will use in a three day period, otherwise it will go rancid. The spores will last until you put the frames back into production, then the bees will polish out the cells. In the dry powder form the shelf life is many years, keep cool and dry.
I had about 5 shallow supers that got sprayed with certan from Kelley's (that should tell you how long ago that was) stacked up and forgotten in my Mom's garage for close to 20 years, looked as good as the day it was put away.
I mix a gallon at a time and use a hand sprayer. One quart will cover both sides of about 30 deep frames. Just need to get a good mist into the bottom of the cells, let it air dry before stacking up to prevent mold. Mix only what you will use in a three day period, otherwise it will go rancid. The spores will last until you put the frames back into production, then the bees will polish out the cells. In the dry powder form the shelf life is many years, keep cool and dry.
I had about 5 shallow supers that got sprayed with certan from Kelley's (that should tell you how long ago that was) stacked up and forgotten in my Mom's garage for close to 20 years, looked as good as the day it was put away.
