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Tried using a 3:1 water to dish soap mix in my sprayer for aphids on a client's maple, and it completely stripped the bark's outer layer.
It was a young Autumn Blaze maple in their backyard. I'd read online about the soap mix being a gentle alternative to harsh insecticides. Mixed it up, sprayed the whole canopy. Came back a week later and the bark on the younger branches looked sunken and papery, almost like it had been sanded. The aphids were gone, but so was a lot of the tree's protection. Learned that even 'natural' solutions can be too strong if the concentration is wrong, especially on sensitive species or new growth. Has anyone else had a similar reaction with soap sprays? What's a safer ratio you'd recommend?
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rowanwells6mo ago
Yeah that 3:1 mix is crazy strong. I did a 1:20 ratio on some rose bushes last year and it still burned the new leaves. For young maples, I wouldn't go past a 1:30 mix, so like half an ounce of soap per gallon. Even then, test it on one small branch first and wait a couple days. The soft soap they sell for plants is milder than dish soap, but you still gotta dilute it a ton.
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dakotal164mo ago
Hold up. You're way too cautious with that soap mix. I've been using 1:20 on my Japanese maples for years and never had issues. Maybe you're using the wrong kind of soap or spraying in direct sun. @ryan_nguyen is right that natural fixes can backfire, but that's usually user error not the ratio. Soft soap is softer sure but dish soap works fine if you rinse after 15 minutes. Young maples are tougher than people give them credit for. I think folks get scared by horror stories and overcorrect.
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