Hardiness Zone: 6a
By herblady2 from IN
Here are the recent answer to this question.
By Seamus R.07/22/2012
According to Colorado State University you want a 2% solution of dish soap to water, for example add 4 teaspoons of dish soap to a quart of water. See documentation at http://www.ext.colostate.edu/pubs/insect/05547.html/ for complete article and a chart of dilutions.
Here are questions related to Dish Soap for Aphids.
I am looking for a recipe for killing aphids with dish soap and water.
By Mary from Butler, PA
By Donna Lusk 02/24/2012
get a large spray bottle big enough to hold the followig ingredients:
1 cup vegetable oil or white mineral oil
2 cups water
2 teaspoons bleach free dish soap
Add all ingredients to spray bottle and shake well before each use because the oil separates from the soap mixture once it sits for a bit. When spraying your plants, bushes etc... be sure you spray under the leaves and on any new growth as that is where the aphids love to hide and eat. This works excellent for us and I hope it will do the same for you. Be sure not to add more soap than required as it can kill your plants.
Donna L. Watauga, TX
Will liquid a hand soap dissolved in water kill aphids?
I used dish soap and water on my garden all last summer with great success. The inexpensive store brand worked the best. Start with a few drops per 32 oz spray bottle, every other day for a few days. Then keep increasing the soap ratio as the plants get used to it. The bugs and slugs hate it but the bees seem to still work around it. Make sure you get the soil too because that's where they lay their eggs. Dish soap acts like a fertilizer for the soil too. I sprayed before dark and it worked great. Good luck!
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We have aphids on some of our plants. I have heard that dish soap in water will control them. Does anyone know the amount of dish soap to use?
Hardiness Zone: 6a
Edie from Spokane, WA
It's true. When sprayed on aphids, a solution consisting of liquid dish soap and water will kill aphids and many other soft-bodied insects such as caterpillars, thrips, mealybugs, spidermites, leafhopper, lace bugs, and whiteflys. Most of these soaps are made from the potassium salts of fatty acids. When sprayed on soft-bodied insects, these fatty acids disrupt the structure and permeability of the insects' cells, causing the contents to leak out, which quickly kills them. Most any type of liquid dish soap will work, but DAWN is biodegradable and contains no phosphates, which is better for the environment.
Insecticidal soaps only work on contact and not as a preventative measure. In other words, the soap needs to completely cover the body of the pest you're trying to control. Dried soap residue on the plants will not harm the insects. The disadvantage to using insecticidal soaps is that it causes phytotoxicity (damage from chemicals) in some plants. Here are some tips for using insecticidal soaps effectively:
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