If your lilies are covered in bright red beetles this spring, you’re not alone. Lily beetles have become a major problem across Saskatchewan over the last few summers, and they can quickly destroy lily plants if left untreated.
Adult beetles and their larvae feed on lily leaves, stems, and buds, often stripping plants down completely.
What You Can Do
Start Scouting Early
As soon as your lilies begin popping up in spring, start checking plants regularly for adult beetles, eggs, and larvae. Catching them early makes a huge difference in preventing major infestations later in the season.
Hand Pick Beetles and Eggs
The best defence is regular hand picking. Remove:
- Adult beetles
- Orange egg clusters under leaves
- Larvae
Dropping them into a bucket of soapy water works well.
Use Insecticidal Soap
Insecticidal soap sprays can help control young larvae when applied regularly. Be sure to spray both the tops and undersides of leaves.
Try Diatomaceous Earth
Diatomaceous earth can also help reduce larvae and soft-bodied insects. Apply it around the base of plants or lightly on foliage during dry weather, and reapply after rain.
Consider Stronger Treatments
For heavier infestations, products like Bug-X Out or other permethrin-based garden sprays may help control adult beetles and larvae. Always follow label directions carefully and avoid spraying when pollinators are active.
Keep Plants Clean
Removing damaged foliage and cleaning up garden debris in fall may help reduce overwintering beetles for next season.
Consistency Is Key
Unfortunately, there’s no one-time fix for lily beetles. Regular monitoring and early treatment make the biggest difference in protecting your lilies throughout the summer.
If you have questions about identifying lily beetles or choosing the right treatment options, stop by Early's Farm & Garden Centre and chat with our gardening experts — we’re always happy to help.