Status of rice pest management in Sri Lanka [insecticides]

agentes nocivos agricultural chemicals animal animal nuisible animales animales nocivos animals arroz asia asie cereales cereals crops cultivos cultivos de grano economic plants facteur nuisible grain crops injurious factors insecte nuisible insecticidas insecticide insecticides noxious animals organisme nuisible pest control methods pest insects pesticide pesticides pests plagas plaguicidas plantas plante plante de culture plants produit agrochimique rice riz sri lanka