Induced resistance to turcicum leaf blight in maize when doubly infected with maize streak virus disease

The effects of dual infection by maize streak virus (MSV) and turcicum leaf blight (TLB) on symptom expression and pathogen reproduction were measured in one maize variety susceptible to both diseases. Infection by MSV masked symptoms of TLB. There was markedly slower disease progress of TLB on dual ly infected plants compared with the singly infected plants, as reflected b y longer latent period, smaller plant leaf area affected and smaller and fe wer lesions in doubly infected plants.