Celery had a plague

Asked August 24, 2015, 7:19 PM EDT

What are these, they seem to be farmed by little red ants. How can we treat this? Will it spread throughout our green house? Thank you.

Outside United States

1 Response

Hi -

Usually, ants farm aphids for the sweet nectar produced by the aphids. I can't see this very well in the photo, but I'm rather sure that's the case due to the presence of the ants.

Here is a factsheet with details and control options: