Senescent RBC's are mainly attacked in-
P. malariae which attacks mainly senescent (old) RBC’s: Agent of Quartan malaria
P. ovale and P. vivax: attack younger RBCs and reticulocytes: Agent of benign tertian malaria
P. falciparum: attacks RBC of all ages: Agent of malignant tertian malaria.
Vivax malaria
Ovale malaria
Falciparum malaria
Quartan malaria