A Comparison of Maize Stalk Rot Occurrence in Bt and Non-Bt Hybrids

Plant Disease
E W GatchG P Munkvold

Abstract

Stalk rots, caused by a complex of fungal species, are among the most widespread and destructive diseases of maize. Larvae of the European corn borer (ECB) (Ostrinia nubilalis) promote stalk rot development by creating entry points for fungi, serving as vectors of pathogens, and causing physiological stress that may predispose plants to stalk decay. Field experiments were conducted in 1998, 1999, and 2000 to determine whether the use of transgenic Bt hybrids expressing insecticidal proteins would influence stalk rot symptoms (pith disintegration, pith discoloration, and lodging). Five hybrids representing different Bt types (or "Bt events") (176, BT11, MON810, DBT418, and CBH351) were paired with their near-isogenic, non-Bt counterparts and subjected to treatments of manual and natural infestation with ECB larvae. Manual infestation resulted in significantly more ECB tunneling than natural infestation in 1998 and 1999 and significantly more lodging in 1998. There were significant linear correlations between ECB injury and stalk rot symptoms in non-Bt hybrids in 1998 and 1999, but not in 2000. A standard foliar insecticide treatment for ECB did not significantly affect stalk rot symptoms. In 1998, Bt hybrids had significantly le...Continue Reading

References

Jun 1, 1989·Microbiological Reviews·H Höfte, H R Whiteley
Jan 1, 1997·International Journal of Colorectal Disease·C S RichardS Gallinger
Jul 1, 1999·Plant Disease·Gary C Bergstrom, Ralph L Nicholson

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Citations

Apr 27, 2002·Applied and Environmental Microbiology·John P RheederHester F Vismer
Oct 24, 2008·Phytopathology·C Venard, L Vaillancourt
Apr 1, 2007·Plant Disease·Samuel C DalmacioGary P Munkvold

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