Treating Mealybugs on Drosera filiformis: Targeted Insecticide Application

Mealybugs on Drosera filiformis (dewthread sundew) are uncommon but treatable. These pests hide in the crown where new growth emerges, avoiding the sticky tentacles.

How to Apply Insecticide Safely

1. Use a systemic insecticide: Imidacloprid (Bayer products) or acephate (Orthene) are absorbed by the plant and kill sucking insects.
2. Spray the crown thoroughly: Focus on the center where new leaves emerge—this is where mealybugs congregate.
3. Follow label reapplication intervals: Usually 7–14 days for a second treatment.

Why Systemics Work Best

Contact sprays often fail because mealybugs are protected by wax and the plant's mucilage. Systemics move through the vascular tissue, reaching pests in hidden crevices.

Precautions

• Apply in early evening to reduce leaf burn risk.
• Avoid spraying open pitchers or flowers.
• Test on one leaf first if using a new product.

Additional Resources

For a full guide on safe insecticides for carnivorous plants, watch the Sarracenia Northwest podcast: YouTube Link.

With prompt, targeted treatment, your D. filiformis should recover and resume vigorous growth.