You can mix one clove of sliced garlic, one sliced onion, one tablespoon of cayenne pepper and 1 quart of water. Steep for one hour, strain, add a tablespoon of liquid soap and spray it around the house for ant and/or roach control. Much better than toxic pesticides.
You can pour boiling water over a couple of sliced lemons with the peel and steep for 24 hours; place the liquid in a spray bottle and use to kill fleas and other pests.
Here is a recipe for a very good mosquito repellent that you can make yourself.
Combine in a 16 oz. bottle:
15 drops lavender oil
3-4 Tbsp. of vanilla extract
1/4 Cup lemon juice.
Fill bottle with water. Shake. Ready to use.
For weed control, mix 1 gallon of white vinegar, ¼ cup of liquid dish soap and 1 cup of salt in a garden sprayer. When you spray the weeds, it works faster on sunny days. No reason to use Roundup or other toxic herbicides.
Centipedes, cockroaches, booklice, earwigs, and silverfish can be repelled, by placing several drops of peppermint or eucalyptus essential oil in areas that collect moisture, such as damp basements, garages, and cabinets where there are plumbing fixtures. If you have black widows or other spiders in areas you don’t want them, you can spray the area with peppermint essential oil. That will prevent spiders from returning to these areas.
You can kill any bug in your house with a mixture of water (40%), alcohol (40%) and dish soap (20%). No need to ever use pesticides inside your home or business.
For mice, place several sprigs of fresh peppermint between pantry items in your cabinets, or make a solution of 2 cups water and 3 teaspoons of peppermint essential oil and spray wherever you find mouse droppings. You can also soak some cotton balls in peppermint essential oils and place in areas where you don’t want mice, inside or outside and even under the hood of your vehicle to prevent them from chewing on wires.
Spraying infested plants with a mixture of half water and half isopropyl alcohol, mixed with a dash of dish soap will also kill many insect pests. Make sure to test this product, and others mentioned, on some leaves of any plants that may be sensitive, so they aren’t negatively affected. It is also a good idea to put pieces of flat boards, about a foot by two feet, on the ground in various places in your garden. Many pests will use these boards to hide and you can find them in the morning and dispose of them.