[Eric Vinje]

Hi Michael –

The biggest benefit to using commercial insecticidal soap is that it has the best dilution rates for the most success in killing off pests along with the added benefit of sticking agents to make it more effective than your typical dish soap. Keep in mind, that we sell many natural herbicides that are made from the same ingredients —
potassium salts of fatty acids — they’re just more concentrated and will kill plants as well as pests. Once the soap spray has dried, it’s ineffective.

When it comes to a regimen to knock back pests and keep your garden healthy, I would suggest cycling through a couple of different products for best results. Aphids produce very rapidly so, building a tolerance is not uncommon. A pyrethrin spray would be advisable as that targets their nervous system and kills much more effectively along with an insecticidal soap to break down the membrane of the aphid. Applying these on a rotating schedule should prove to be a bit more effective. Diatomaceous earth can also be used against aphids. A mild abrasive, it kills insects within 48 hours of contact… indoors or out!

Another option you may want to consider is to release ladybugs on your affected plant. These beneficial insects are happy to munch on unsuspecting aphids and help to clear up the problem.

https://www.planetnatural.com/pest-problem-solver/lawn-pests/aphid-control/

Hope this helps!