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Bacterial Leaf Blight on shrunken-2 Sweet Corn
J K Pataky1, L J du Toit1, M R Kerns1
1Department of Crop Sciences, University of Illinois, Urbana 61801.
Plant Disease
|March 14, 2019
Summary
Bacterial leaf blight (BLB) did not significantly impact sweet corn yield in trials, even on susceptible shrunken-2 (sh2) hybrids. This research assessed BLB severity and its economic loss potential on various sh2 sweet corn varieties.
Area of Science:
- Plant Pathology
- Agronomy
- Genetics
Background:
- Bacterial leaf blight (BLB), caused by Acidovorax avenae subsp. avenae, poses a threat to shrunken-2 (sh2) sweet corn production.
- Sporadic outbreaks and severity in conducive environments necessitate understanding BLB's economic impact.
Purpose of the Study:
- Evaluate the severity of BLB on sh2 sweet corn hybrids, inbred lines, and crosses.
- Assess the impact of BLB on sweet corn yield, specifically ear weight and marketable ear count.
- Determine the potential for economic losses due to BLB in sh2 sweet corn.
Main Methods:
- Field evaluations of 122 sh2 hybrids, 30 sh2 inbred lines, and 29 crosses over two years (1994 and 1996).
- Assessment of BLB severity using a 1-9 rating scale.
- Measurement of ear weight and marketable ear number to determine yield impact.
- Comparison of inoculated and non-inoculated plots to isolate BLB effects.
Main Results:
- Average BLB severity ratings for hybrids were 3.3 (1994) and 3.7 (1996) on a 1-9 scale.
- No significant differences in BLB ratings were observed among kernel colors (yellow, white, bicolor).
- Despite moderate foliar symptoms, BLB did not substantially affect overall yield, with only minor reductions in ear weight for a few hybrids in one year.
Conclusions:
- BLB severity varied among sh2 sweet corn genotypes, but mid-parent values generally predicted cross reactions.
- Economic losses from BLB were not substantial in these trials, even for susceptible hybrids.
- Further research may be needed to identify specific genetic resistance or management strategies for BLB in sh2 sweet corn.
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