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Title

Genetic and environmental factors reducing the incidence of the storage pest Sitotroga cerealella in maize

AuthorsButrón Gómez, Ana María ; Romay Álvarez, María Cinta ; Ordás Pérez, Amando ; Malvar Pintos, Rosa Ana ; Revilla Temiño, Pedro
KeywordsLepidoptera
Gelechiidae
Environmental covariates
Genotypic covariates
Resistance
Stored products
Angoumois grain moth
Issue DateSep-2008
PublisherBlackwell Publishing
CitationEntomologia Experimentalis et Applicata 128 (3): 421–428 (2008)
AbstractThe Angoumois grain moth, Sitotroga cerealella (Olivier) (Lepidoptera: Gelechiidae), is found worldwide and infests maize grains in the field and during storage. Transgenic maize resistant to kernel attack by S. cerealella has been developed, but could pose a nutritional risk to humans and livestock. Therefore, alternative sources of resistance posing no threat to consumption should be identified. In this study, our main objectives were to assess genetic variability for kernel damage by S. cerealella under natural infestation and to determine genetic and environmental factors contributing to genotype, year, and genotype*year variability. Factorial regression was performed to obtain a biological explanation for the number of kernels damaged per ear. Seventy-seven Spanish maize landraces along with six hybrid checks were evaluated in 2004, 2005, and 2006. There was variability for kernel damage by natural infestation of S. cerealella among the landraces: popcorn landraces were among the least damaged, whereas hybrid checks were among the most susceptible genotypes. Plant characteristics associated with ear appearance could be the main stimulatory factors for oviposition and feeding of S. cerealella moths, followed by husk coverage of the ear. It was confirmed that temperature is the main environmental factor affecting S. cerealella development. Genotypes sensitive to infestation by S. cerealella were more negatively affected by higher temperatures than the least attractive genotypes, and lower temperatures reduced the number of kernels damaged on the most susceptible genotypes more than on the least susceptible.
Publisher version (URL)http://dx.doi.org/10.1111/j.1570-7458.2008.00733.x
URIhttp://hdl.handle.net/10261/102274
DOI10.1111/j.1570-7458.2008.00733.x
ISSN0013-8703
E-ISSN1570-7458
Appears in Collections:(MBG) Artículos
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