**P.O. Bhuntar, Distt. Kulu, Himachal Pradesh.
Division of Mycology and Plant Pathology, Indian Agricultural Research Institute, New Delhi, 110012
*This work is supported by PL-480 Funds (Grant No. FG-In-405) through the Indian Council of Agricultural Research.
Nineteen maize lines possessing monogenic, and one digenic type of resistance to Helminthosporium turcicum mnd 29 monogenic cines resistant to Puccinia sorghi were evaluated at Kalimpong and Bajaura by exposure to natural infection in 1970 and 1971 crop seasons. On all 20 lines, large wilt type lesions accom-panied by a high degree of sporulation developed suggesting thereby the presence of strains or isolates of H. turcicum capable of attacking these lines It has been emphasized that to rate these or similar lines as resistant on the basis of tests in seedling stage alone is hazardous.
