Evaluation of Spodoptera exempta nucleopolyhedrovirus (SpexNPV) for the field control of African armyworm (Spodoptera exempta) in Tanzania.Grzywacz D, Mushobozi WL, Parnell M, Jolliffe F, Wilson K. 2008. Evaluation of Spodoptera exempta nucleopolyhedrovirus (SpexNPV) for the field control of ...