Hundreds of aphids have decided to take up residency on the various veggies in the aquaponics system I help maintain; gorging insidiously on the plants and multiplying by the dozens. If not stopped soon, I fear it will be too late to turn things around.
My relatively small recirculating system consists of two long/shallow grow basins (containing mostly lettuces, broccoli and parsley at the moment) connected to three barrel-like barramundi tanks housed in an adjacent space; we cycle the water through continually and maintain a constant growing temperature to ensure optimal crop yield. It's not a half-bad set up if I don't say so myself, and annoyingly these pests seem to think so too!
We need them evicted as soon as possible for the greater good of the plants, but doing so is proving a challenge. Any chemical or kitchen remedies for aphids - like the garlic and vinegar solution - were immediately scratched, since anything we spray on or around the plants will get into the water and effectively be sprayed on the fish as well. Hearty as they are, I'm sure barramundi don't particularly enjoy breathing garlic water. Plus, we're an all organic system.
So, any ideas on how to tackle this problem?