Malathion is an organic insecticide that targets a wide range of sucking and chewing insects. This means that it is a good chemical to use to help protect fruits and vegetables in your gardens and fields. There is a problem with using Malathion though, it is very toxic. If you are exposed to it during or shortly after spraying it can cause your chest to become tight after breathing it in and it can damage your nervous system. The best way to stay safe with Malathion is to stay away from places that are being sprayed.