Dishwashing liquids are primarily designed to dissolve grease from dishes and clean clothes, not to kill insects. Dish detergents may dissolve the protective waxes on the plant leaves. Commercially available insecticidal soaps are less likely to dissolve plant waxes.
It's not recommended to use dish detergent (like Dawn), laundry detergent, or hand soap (even the “natural” versions), since these soaps contain abrasive ingredients that could harm your plants. For DIY insecticide, organic pure castile liquid soap is the best solution since it's all natural and highly effective.
Because soapy water works by touching the insects, sprays need to be made whenever new insect populations appear and start to grow. Spraying soap directly on the leaves when no insects are present does nothing, as soap doesn't bother insects if they eat it. It only works if it contacts the full body.
2.5 tablespoons of liquid dishwashing soap (preferably Dawn or Lemon Joy) and not automatic dishwasher soap Mix with 2.5 tablespoons of vegetable oil per gallon of warm water. Make only what is needed for one day's treatment. An insecticidal soap like this is generally not harmful to plants, animals or humans.
Use 1 tablespoon of mild soap (like dish soap or castile soap) to 1 cup of vegetable oil. Mix well. Add 2 tablespoons of the oil mix to 1 quart of water and pour into a spray bottle. Spray the top and bottom of each leaf where the insects are dwelling and the stems if needed.
Hot Pepper Repellent Spray: Hot pepper is also a good repellent and works on rabbits and deer as well as many insects. Mix 1 tablespoon dried chile powder, 1 quart of water, and 1 teaspoon of mild soap. Spray full strength on the plants under attack.
Vinegar spray
You can also add half a teaspoon of dishwashing soap to help the solution adhere. Shake thoroughly and apply to the affected areas. The acetic acid in the vinegar will treat a wide range of garden pests but it requires contact. If you have whitefly eggs be sure to spray under the leaves.
Some commonly available insecticidal soap brands are: Bonide Insecticidal Soap RTU. Espoma Organic Insect Soap RTU. Garden Safe Insecticidal Soap Insect Killer RTU.
As a whole, the biweekly application of soapy water to plants is enough to get rid of pests. It's crucial to spray directly on the insects, coating them entirely. However, this homemade dish soap mixture may kill beneficial bugs and damage plants due to its additives and varying concentrations.
Keep Pests Away
Sprinkle baking soda on your soil with a flour sifter to keep ants, roaches and slugs away from your garden. (Be sure to avoid your plants!) It's a safe way to keep beneficial insects around and say sayonara to the ones you're tired of seeing.
Oil Spray. An effective insecticidal spray can be made with two very simple ingredients: soap and oil. Oil spray works by coating enclosing and smothering soft-body insects, such as aphids and mites. Mix a cup of vegetable oil with a quarter cup of liquid soap and shake it well.
By mixing 2.5 tablespoons of vegetable oil and 2.5 tablespoons of pure liquid soap with 1 gallon of distilled water, you'll have a whole gallon of insecticidal soap for safely spraying plants in flowerbeds or the vegetable garden.
Although you do not have to rinse off the soap after using it, it might be beneficial for you to do so.
Acetic acid makes vinegar an excellent tool for pest control, repelling some of the most common backyard nuisances and even killing weaker insects. It's most effective against ants, spiders, and mosquitos. You can keep spiders from entering your home by spraying vinegar around your property's perimeter and entryways.
Make an All-Purpose Insect Repellent
Lemongrass or citronella oil, and 1 tbsp apple cider vinegar. 1 cup isopropyl alcohol, 1 cup water, ½ tsp. catnip oil. 1 cup alcohol or witch hazel and 10-20 drops of essential oils such as lemongrass, peppermint, or lemon eucalyptus.
How do you make bug spray with Dawn dish soap? Mix two tablespoons of Dawn dish soap with a gallon of water to make bug spray with Dawn dish soap. Transfer the solution into a spray bottle & utilize it as a spray for repelling mosquitoes.
Peppermint. Peppermint essential oil might just be the holy grail of natural pest repellents to leave around your home's entry points, as it can help keep away ticks, spiders, roaches, moths, flies, fleas, beetles, and ants. Use sachets of this oil near your doors and windows or try making a diffuser or spray.