Caterpillars and Aphids on Petunias: Hand-Picking and Spinosad

Wave petunias suddenly losing blooms? Check for caterpillars eating flowers and cast skins of aphids (tiny white specks) on leaves. The caterpillars are likely tobacco budworms or variegated cutworms.

Immediate Actions

• Hand-pick caterpillars: Drop into soapy water or relocate for birds. Best for small plantings.
• Spinosad spray: Organic, bacterial-derived insecticide effective on caterpillars. Safe for bees once dry (apply evening). Follow label.
• Aphid control: Blast with water, then apply insecticidal soap weekly until gone. Cast skins indicate past generations—live aphids may still hide.

Prevention

1. Inspect plants daily during bloom.
2. Remove spent flowers to reduce egg-laying sites.
3. Encourage birds with feeders/baths—they eat caterpillars.
4. Avoid broad-spectrum insecticides that kill beneficials.

Petunias recover quickly if treated early. Monitor weekly through season.