Use of communication media in changing rice farmers' pest management in the Mekong Delta, Vietnam

agriculteur agricultores arroz chemical control cnaphalocrocis medinalis control de plagas crop yield damage decision making ensemencement farmers farmers' attitudes insecte nuisible insecticidas insecticide insecticides lutte antiravageur lutte chimique oryza sativa pest control pest insects pest management pests of plants plagas de plantas ravageur des plantes rendement des cultures rendimiento de cultivos rice riz siembra sowing spraying toma de decisiones viet nam vietnam