A study of the host range of Exserohilum turcicum, using isolate DI
sprayed on the plant leaves as a spore suspension (105 spore/ml) showed that all
isolates of E. turcicum produced three distinct symptoms including: (1) in the
corn group; early lesions are gray-black and enlarged along the length of the
leaves as brownish-gray, elliptical-shaped lesions. Severe symptoms included
coalescence of lesions as brown stripes, blight and death (2) in the rice and
sorghum group symptoms included single small red-brown spots or dense
clustering of reddish-brown lesions, or dark red stripes throughout an entire leaf
and (3) in the grasses group symptoms were brown or grayish-black lesions
surrounded by a yellow area. Our results agree with the work of Shurleff
(1980), and Frederiksen and Franklin (1980) whose reports characterized the
infection of these plants by the NCLB pathogen. However, no symptoms were
detected on the sugarcane, though Harlpur et al. (2007) reported that in India