Results of the South Asia regional Helminthosporium leaf blight and yield experiment, 1993-94 - Mexico, DF (Mexico) CIMMYT|UCL|BADC : 1998 - Printed
Helminthosporium leaf blights, caused by Bipolaris sorokiniana and secondarily by Drechslera tritici-repentis, are important in the eastern part of the Indian subcontinent. This paper presents resistance and yield data for 18 wheat genotypes tested at seven locations in Bangladesh, India, and Nepal under natural infections of B. sorokiniana and D. tritici- repentis. The objective of the experiments was to determine whether the tested genotypes possessed adequate resistance to natural infection by these pathogens and good adaptation to the eastern part of the subcontinent. Superior genotypes had significantly lower AUDPCs (area under disease progress curve), were generally higher yielding than the local check (Sonalika), and headed early to moderately early. The best entries were to be used directly in breeding programs. At least 10 of the genotypes [Bhrikuti (NL623), Kundan, NL644, A6/Glen (BAW 714), K8027, HUW206, Annapurna 1, Fang 60, and NL297] were moderately resistant to resistant to the blights and possessed other required characteristics. It was confirmed that heading was negatively correlated with AUDPC. Covariance analysis or grouping genotypes by heading date, with an internal check in each group, may help reduce this confounding effect.
633.1194 / DUV