A fresh picked bud? In a container? That's your first problem. You don't out wet weed in a dark place in an almost airtight container. That is a recipe to create mold. Buds MUST be 90% dry before putting them into any kind of container with a lid, or mold will form.

I'd suggest making oil from it, as the Alcohol will kill the mold on contact, but it's only 3 grams. You'll be lucky to get .5gram of oil from it.

Toss it, and learn from this mistake so you don't do it again.