I have an ongoing problem with black aphids in my garden. They lay waste to my spring onions, garlic chives, normal chives, garlic (when I grow it) and pretty much anything else I plant in the allium family.
Black aphids thrive in moist conditions and particularly enjoy weaker plants. Because my garden gets less than full sun I think my plants are particular susceptible.
Here are some attacking a baby garlic chive plant:
I have tried squishing them. I have tried spraying them off with the hose (a technique I find effective with normal aphids). I have tried chilli and garlic sprays. No success. The only thing I can find that gets rid of them is pyrethrum.
Hence the question – should I use it? I know it’s generally considered a ‘safe’ pesticide, but not necessarily by everyone. I also know it can kill beneficial insects if they come into contact with it.
So should I use it? Do you use an insecticide? Or another method for containing the bugs?