[Natural balance and biological control].
D000818:Animals; D001315:Australia; D001938:Brazil; D004199:Disease Vectors; D004463:Ecology; D007300:Insect Control; D011647:Puerto Rico; D012552:Schistosomiasis / Q000517:prevention & control; D012908:Snails
Equilíbrio da natureza e contrôle biológico.