Seminario regional sobre insecticidas, fungicidas y herbicidas. Managua (Nicaragua) 12-18 May 1974

action des pesticides biological control biota biote classification control de insectos environment environnement escarda fongicide fungicidas fungicides herbicidas herbicide herbicides insect control insecticidas insecticide insecticides lutte anti-insecte lutte biologique malezas mauvaise herbe medio ambiente nicaragua pesticide actions toxicidad toxicity variedades varieties weed control weeds