FLY TRAP BAIT
The bait comes packaged as a medium-size plastic bag filled with yeast (tan granules) inside which is a much smaller bag containing the catalyst, ammoniun carbonate (white powder). To prepare the bait, pour the yeast and and its catalyst into a plastic gallon jug (a plastic milk jug, for example). Slowly add 1/2 gallon of warm water, cap and shake lightly to mix. Leave the cap loose for 7 days, which allows the brew to breathe.' Store in a cool, dry, shady or dark place. After 7 days, add enough warm water to nearly fill the container and shake thoroughly.
If you wish to use a substitute bait in the interim, mix together one beaten egg and a 12-ounce can of soda or beer. Pour the mixture into the bait bowl until it is about 1/4 full. Once the yeast bait is ripe, you can add it to the substitute bait by pouring it through the trap lid, through the inverted cone, and into the bowl, Don't be concerned if you spill some bait on the ground. For best results, add one tablespoon of bait to the bowl every day or every other day. One gallon of bait lasts about 4-6 weeks.
Because dry yeast has a limited shelf life, mix your bait as soon as you receive it, even if you won't be using it immediately. Store the mixture in a cool, dry, dark place. It gets better with age.