What are the small black bugs on my nasturtiums?

July 6, 2023 Ask the Expert, Managing Insect, Diseases, and Animal Pests

Question:

A small black bug has taken over my nasturtiums! I’ve never seen an infestation likes this before on any of my plants. What are they and how do I manage them?

aphids on nasturtiums — Photo used with permission from client.

Answer:

Caragh B. Fitzgerald, Associate Extension Professor

Those insects are aphids. Often aphids are not very problematic, but sometimes they can be severe enough to affect the plant. A strong stream of water can dislodge them and is a good first line of management. Insecticidal soap can also be very effective. More details can be found in the UMaine Extension Pest Management Fact Sheet #5039, Sucking Insects That Affect Vegetable Plants.