Spraying programs (especially using DDT) were curtailed due to concerns over safety and environmental effects, as well as problems in administrative, managerial and financial implementation.
Reducíronse os programas de aplicación de insecticidas (especialmente usando o DDT) debido á preocupación pola seguridade e efectos ambientais, e polos problemas administrativos, de xestión e financeiros para a posta en práctica.