Aphids are small green insects that are notorious for destroying plants. They infest anything from small flowers to fruit plants such as tomatoes. When an aphid problem is caught early enough, the damage can be minimal. However, if it goes on for too long, an entire plant can be killed. Fortunately, aphid problems are generally easy to take care of. Once you get rid of them, the chance of them returning in the same season is slim.
Examine the plants to make sure you have aphids. The first sign of a possible aphid infestation is yellowed, curled leaves.
Remove as many aphids as you can with your hands. Aphids can typically be found in clusters anywhere on the tomato plant. Be sure to look both on top and bottom of leaves. Put the aphids in a jar and seal it until they die.
Cut off any infested portions of the plant with garden shears. Dispose of the infested plant matter as far away from the garden as possible.
Mix 1 cup of vegetable oil, 1 cup of warm water and 1 tbsp. of liquid dish soap in an empty spray bottle. Shake the bottle vigorously for 10 seconds to thoroughly mix the ingredients together. Spray the mixture all over and around the tomato plants to keep the aphids away.
Introduce ladybugs to the area. Ladybugs will eat the aphids but will not harm your plants. They are also good for killing off other types of insects that may intrude into your garden.