Spider mites and white flies are two very common pests found on and near outdoor plants in your garden. If the plant becomes infested with these in high numbers, it can become damaged and eventually die. These insects can be hard to spot since they live on the underside of the leaves. If they are left untreated, they can breed very rapidly. You can either kill them with a systemic pesticide or with some common household items that are much less toxic to the environment. With a little patience it is fairly easy to kill spider mites and white flies on outdoor plants.
Mix 32 ounces of water with a teaspoon of liquid dish detergent. Pour into a pump sprayer or spray bottle.
Spray all the foliage of the plants with the detergent spray. Make sure you spray under the leaves and ensure the solution covers every square inch of plant surface. If you run out of detergent spray, mix more up.
Take a yellow plate and smear with petroleum jelly. Set this near your plants. White flies will be attracted to the yellow plate and become trapped in the petroleum jelly, thus sparing your plants.