SOAL DAN JAWABAN TRY OUT NASIONAL BAHASA INGGRIS STIS PAKET 4

By experimenting with combination of chemicals, manufactures have produced a wide variety of effective dusts and sprays to control plant pests. Some, such as those containing pyrethrum, work well and do rat harm to people, pets and birds. There are others that contain stronger chemical, such as DDT, melathion, fazinat, and chlorine. These can be extremely dangerous if they are not properly