Keeping apples free of “worms” (the larvae of the codling moth) is one of the biggest challenges for backyard growers who prefer natural methods. Fortunately, you don’t need harsh chemicals or expensive commercial sprays to protect your fruit. A simple homemade codling moth trap, made from a used milk jug and a sweet fermented bait, can dramatically reduce moth activity and help you grow clean, healthy apples all season long.
This method has been used for generations, and it remains one of the most effective organic helpers—especially when combined with a few orchard habits that break the moth life cycle naturally.
What You Need to Make the Trap
- 1 clean 1-gallon plastic milk jug (with the cap)
- Sharp knife or hole saw
- String, twine, or cloth strip for hanging
- Optional: funnel to pour the bait
- Bait ingredients (makes ~1.5 quarts):
- 1 cup apple cider vinegar
- 1/3 cup dark molasses
- 1/2 teaspoon household ammonia
- Water to reach 1.5 quarts total
Best Time to Hang the Trap
Right after the blossoms fall (petal fall) — this is when the first moths are searching for places to lay eggs.
Leave the traps out through the entire summer for continuous protection.
How to Make the Trap (Step-By-Step)
1. Cut the Entry Hole
Using a sharp knife, cut a round opening about the size of a small egg just below the jug’s shoulder (on the side opposite the handle).
This size is big enough for moths to enter but small enough to avoid rain splash.
2. Mix the Bait
Pour the vinegar, molasses, and ammonia into the jug.
Add water until you reach roughly 1.5 quarts.
Swirl gently to mix everything together.
The unique combination of sweet, fermented, and slightly sharp scents attracts adult codling moths extremely well.
