Aphids and dish soap?

I have aphids on my willow and 2 other trees... i am wondering how to get rid of them without using chemicals as I have koi and chemicals are banned... any suggestions to safely treat my trees???? Does dish soap actually work or will that harm my trees?
Submitted by christarichmond

Hi, Don't use straight dish soap. Instead, buy commercially formulated insecticidal soap. It's a liquid, soap-based organic insecticide that will take care of your aphids. You can buy insecticidal soap sprays at most garden centers.

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