Can Dawn dish soap kill mealybugs effectively?

When done properly, Dawn dish soap makes a great home remedy for mealybugs. The surfactants work to break down the waxy coating on the insect, causing dehydration. As long as the mix is proper and the application is done correctly, it won't damage the plant while effectively eliminating pests. I have used this with my houseplants for many years.

The soap solution operates by disintegrating the waxy cuticle that protects mealybugs, resulting in a quick killing action through dehydration that kills the insect in hours. Temperature above 70°F will enhance its effectiveness. Reapply every 5-7 days for egg-hatched nymphs.

Be careful not to use too much soap. An excess of soap will burn the leaves of plants, resulting in a brown edge. After treatment, always rinse the plants very well. For plants with fuzzy leaves, such as African violets, spray lightly and blot off the excess.

For the tough cases, use Dawn in conjunction with other methods. Use neem oil sprays on a weekly rotation. Use ladybugs in some instances between applications. I had a full hibiscus plant infestation, but was able to clear it up in three weeks using this method without resorting to chemical means.

Observe plants following treatment. White clusters appear, indicating that it will need to be reapplied. If new growth is emerging, it's working. Leave the treated plants out of direct sunlight for two days. This will prevent phototoxicity after they have been treated while they recover.

Read the full article: How to Treat Mealybugs: 10 Proven Methods