I bought a Tropicana rose that I kept inside through winter. It had aphids that got bad and I used it as like a test subject to see what would work. Insecticidal soap hurt the rose worse than the aphids. Neem oil sprays and root soaks did nothing. So I finally decided to hit them with a real pesticide and got some Eight brand with lambda cyhalothrin. I sprayed the whole plant. Twice, over five days. And it seemed to do absolutely nothing to the green aphids.
I've searched the web and can find nothing about a pyrethroid failing to kill aphids, except a little I formation about some soybean aphids in the Midwest that are resistant. I'm wondering if the bottle of stuff is so old that the pyrethroid broke down completely. I got it off Amazon but there's no date on it.

Any thoughts or experience?

Most of us spray a little water on the plant... the aphids get washed off.

Going nuclear... seems like a bad idea in every way that I can think of...

if you put that plant outside after using systemics... any good bugs that show up to eat the aphids will be harmed, and any bees or butterflies that show up for the flowers will also be harmed... worse... those systemics will continue to cause harm for years...

https://xerces.org/systemic-in...

Yeah this info shows up.
https://extension.umn.edu/soyb...


Aphids in my experience wreck plants ideal development or can wreck them completely, of course not all plants and conditions do matter (where, when, etc).
But I have seen it both in private space and the wild.

The problem is ants protect the aphids from predators and colonize the aphids on various plants, you have to see how ants attack ladybugs to not harm the aphids.

The honeydew aphids excrete create a lot of mold on some cherry trees causing leaves and fruits to rot in our case, it looked quite awful.

They also transmit viruses which is a major problem, sure the regular person may say well my plant didn't make it, but it's not a simple for industrial crops or if one person relies on their garden completely.
All potyviruses are transmitted by aphids.


I would suggest Acetamiprid for aphids, but it's best to use these before the massive infestation before the plants are affected.

Now for a plant one could even remove the first aphids they see and all be well without the need to use these substances which is excellent.
But with trees and lots of plants in the garden for a large space manual removal will be impossible, especially an area with tons of ants offering protection against natural predators.