The acidity of the vinegar will kill potato bugs and all kinds of bad plant insects. Therefore, combine one cup of vinegar, one teaspoon of liquid soap, and three cups of water in a spray bottle. Shake well and use it to spray your plants to kill nymphs and adults.

What home remedy kills potato bugs?

This formula kills potato beetles and Japanese beetles that attack rose bushes. Mix one tablespoonful of canola oil and one tablespoonful of household liquid soap into four litres of water. An optional ingredient is the addition of one tablespoonful of rubbing alcohol. Apply from a sprayer or watering can.

Will Dawn dish soap kill potato bugs?

Will Dish Soap Kill Potato Bugs? Using a simple homemade spray of dish soap and water is a very easy way to kill many garden pests including potato beetles. Mix 1 to 2 tablespoons of dish soap with 1 gallon of water and spray it onto the beetles and larva.