Aphids on Broccoli: Identification and Insecticidal Soap Treatment

A long-time broccoli grower encountered thousands of tiny greenish-black balls on leaf undersides and between florets—initially suspected as fungus. Upon re-examination, they confirmed the pests were aphids (blackish-gray, soft-bodied, squishable, no leaf holes).

Treatment with Insecticidal Soap

Insecticidal soap is an excellent choice for aphids on edible crops. Recommended protocol:

1. Blast plants with strong water spray to dislodge as many aphids as possible
2. Apply 2% insecticidal soap solution thoroughly to all surfaces
3. Wait 30 minutes
4. Rinse thoroughly with water to remove soap residue and dead aphids

Important Precautions

• Test on a few leaves first (jar test)
• Do not use old or homemade soap solutions
• Apply in early morning or evening to avoid leaf burn

For complete guidance, see livingwithbugs.com/insecticidal_soap.html.