African Journal of
Plant Science

  • Abbreviation: Afr. J. Plant Sci.
  • Language: English
  • ISSN: 1996-0824
  • DOI: 10.5897/AJPS
  • Start Year: 2007
  • Published Articles: 683

Full Length Research Paper

Interaction between maize phenology and transgenic maize hybrids on stalk rots following European corn borer infestation

Motshwari Obopile1* Ronald B. Hammond1 and Pierce A. Paul2      
1Department of Entomology, Ohio Agricultural Research and Development Canter, The Ohio State University, 1680 Madison Ave, Wooster, Ohio 44691, USA. 2Department of Plant Pathology, Ohio Agricultural Research and Development Canter, The Ohio State University, 1680 Madison Ave, Wooster, Ohio 44691, USA.  
Email: [email protected]

  •  Accepted: 20 October 2011
  •  Published: 06 December 2011

Abstract

Field studies were carried out at Hoytville and Wooster, Ohio, USA from 2006 to 2008 to determine the influence of planting date and transgenic Bt maize on incidence and severity of stalk rots of maize. Transgenic and non-transgenic Bt maize hybrids with different maturity ratings were planted on late April/early May, mid-May and early June each year. The incidence and severity of the maize stalk rot complex were compared among planting dates and between Bt and non-Bt genotypes of different relative maturities. Significant linear correlations between European corn borer (Ostrinia nubilalis Hub.) injury to stalk and stalk rots were observed in 2006, and 2007, but not in 2008. We observed significant reduction in stalk discoloration and incidence of maize stalk rot on Bt hybrids compared with non-Bt genotypes. Short season hybrids had significantly lower stalk rots than full season hybrids. The benefit of using Bt hybrids to reduce stalk rots was more evident as planting was delayed than early planting.

 

Key words: Transgenic hybrids, relative maturity, planting date, stalk rots.

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