Grow Worm-Free Fruit with the Ziplock Bag Method

For many gardeners, the biggest headache of growing fruit trees is the constant spraying needed to keep pests like plum curculio, codling moth, and apple maggot from ruining the harvest. These insects are the primary culprits behind the "worms" that destroy homegrown fruit, often forcing growers to spray every ten days all season long—a practice that's environmentally objectionable. While sticky traps and pheromone lures offer less toxic alternatives, bagging individual fruits provides another effective, non-toxic solution for pome fruits such as apples and pears.

When I first heard of bagging apples, the recommended method used brown paper sandwich bags stapled around each fruit stem—tedious and time-consuming. Then I realized plastic zipper-style sandwich bags could work just as well. Since adopting this technique, I've enjoyed worm-free fruit while my sprayer sits idle for most of the season. (Note: you may still need to spray for diseases like scab or for pests such as rosy apple aphid if they appear.)

Bagging doesn't completely eliminate insecticide sprays in regions where plum curculio is active early, before petals drop. This pest attacks newly formed apples before they're large enough to bag. Once bagged, however, the fruit is well protected from worms.

How to Bag Your Fruit

Materials: Plastic zipper sandwich bags (generic brands work fine; you may need a couple hundred per tree). They can be washed and reused yearly. You'll also need small scissors, pruners, or nail clippers for thinning fruit and cutting a drainage slit in each bag.

Timing: Bag after the "June fruit drop" when unpollinated fruit falls, or when fruit reaches at least 1 cm in diameter—anytime before codling moths appear in your orchard. If you hand-thin fruit, combine bagging with thinning.

Start by identifying the "king" apple in each cluster—the central, most developed fruit with the thickest stem. Check it for damage, especially the D-shaped egg-laying scar from plum curculio. If clean, remove all other fruits in the cluster with your clippers, leaving only the king.

Cut a small slit in the bottom corner of a bag for drainage, then slip the bag over the fruit and zip it closed around the stem as tightly as possible.

Space remaining clusters at least six inches apart to prevent crowding.

This method works equally well for pears. I never sprayed my pears until codling moths, thwarted by bagged apples, devastated my pear crop. Now I bag pears too.

Note: The bags may appear upside down in photos, but as fruit grows heavier, both fruit and bag hang downward naturally.

Bagging is labor-intensive and best suited for small home orchards. I don't recommend it for stone fruits like peaches—they lack stems to secure bags, and trapped humidity encourages brown rot. Apples and pears don't have this issue. Give bagging a try; you'll drastically reduce sprayer use while harvesting clean, pesticide-free fruit.