Correlations between reactions of sweet corn hybrids to Goss' wilt, Stewart's bacterial wilt and northern corn leaf blight
Phytopathology 75(11): 1336
ISSN/ISBN: 0031-949X Accession: 001327397
Reactions to Goss' wilt [Corynebacterium michiganense pv. nebraskense], Stewart's wilt [Erwinia stewartii] and northern corn leaf blight [Setosphaeria turcica] were highly correlated for 75 mid- to late-season sweetcorn hybrids evaluated in the 1984 Illinois Sweet Corn Disease Nursery and in greenhouse trials. In the disease nursery, correlations between severity of Goss' and Stewart's wilt ranged from 0.64 to 0.77. Hybrid rank correlations were from 0.66 to 0.74. Similar results were obtained in greenhouse trials. It is considered that correlations of hybrid reactions to the 2 bacteria may have resulted from plant morphological characteristics or from genetic resistance. Correlations between reactions to the 2 bacteria and to the leaf blight races 1 and 2 ranged from 0.34 to 0.63; correlations between race 1 and 2 reactions ranged from 0.61 to 0.83 and are thought to be due to polygenic resistance which displayed little or no race specificity.