Fruit Fly Trap
In summer and fall fermentations especially when using fruit or grapes have a tendency to attract fruit flies or fruit gnats. It's important to prevent these pesky little critters from getting into your fermentation vessel. Not only are they unsightly, but the red eyed fruit fly carries acetobacter on their feet. Acetobacter converts alcohol specifically ethanol to acetic acid resulting in vinegar. So, if you'd like cider, wine or malt vinegar, let them in. Otherwise, build a fruit fly trap. Use a small, clean, odorless bottle or jar with a screw on cap. Make sure the jar does not smell of pickles or strong spices. Puncture a number of small wholes in the lid with small nail. Fill the jar or bottle with must or wort, add 2-3 drops of dishwashing liquid soap and screw on the cap. The brand of dish soap isn't important, but the thicker the better. The fruit flies can fly in but cannot fly out. Empty the trap as needed. Clean and refill as long as fruit flies are present. If you don't have a small jar with a screw on lid, try fitting a piece of plastic wrap over the top of the jar making sure that it fits tight and is well sealed around the edges. The plastic wrap can be secured with a rubber band. Polk a half dozen or so small wholes in the plastic wrap with a pencil or pen an proceed as above.