Identification and Comparison of Fall Armyworm (Lepidoptera: Noctuidae) Host Strains in Brazil, Texas, and Florida

Nagoshi, Rod; Silvie, Pierre; Meagher, Robert L.; López, J. D.; Machado, Vilmar

doi:10.1603/0013-8746(2007)100[394:iacofa]2.0.co;2

Cited by 100 publications

(95 citation statements)

References 2 publications

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“…The Tpi-C population was considerably less diverse than its Tpi-R counterpart with respect to nucleotide variations within the Tpi gene. A similar result was observed in comparisons of a portion of the mitochondrial COI gene between the two strains (Nagoshi et al 2007a), although overall genetic diversity among the COI-RS haplotypes was less than observed in Tpi-R on the basis of Hd and nucleotide diversity ( or , Table 3). These observations are consistent with earlier AFLP studies where variation of the observed markers in the ricestrain was estimated to be twice that of the corn-strain (McMichael and Prowell 1999).…”

Section: Discussionsupporting

confidence: 75%

“…Strain-speciÞc polymorphisms within the mitochondrial cytochrome oxidase I (COI) gene are asymmetrically distributed among plant hosts in the Þeld, with the corn-strain haplotype typically representing Ϸ80% of the larvae isolated from corn and the rice-strain haplotype in Ͼ95% of the larvae collected from pasture or turf grasses (Pashley 1989, Prowell 1998. Comparisons of North American and Brazilian fall armyworm collections demonstrate that the two strains exist throughout the Western Hemisphere and can be distinguished by the same markers and exhibit the same plant host biases (Busato et al 2005, Nagoshi et al 2007a, Machado et al 2008.…”

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confidence: 99%

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The Fall Armyworm Triose Phosphate Isomerase (Tpi) Gene as a Marker of Strain Identity and Interstrain Mating

Nagoshi

2010

Annals of the Entomological Society of America

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Fall armyworm, Spodoptera frugiperda (J.E. Smith), is a significant agricultural pest in the United States, affecting most notably sweet corn, Zea mays L., and turfgrass. Two strains exist that differ physiologically and behaviorally but are morphologically indistinguishable. Polymorphisms within the fall armyworm Triose phosphate isomerase gene (Tpi; EC 5.3.1.1) were characterized and used to develop a polymerase chain reaction-based method for discriminating fall armyworm strains. The Tpi markers were used in multilocus analysis to estimate interstrain hybrid frequency and their distribution in populations from the United States and Brazil. The results were compared with previous studies using different marker combinations to test hypotheses about interstrain mating behavior and to explain earlier observations of unusual strain distribution patterns. The importance of understanding the frequency and consequences of interstrain hybridization to deciphering the mechanism of strain divergence and the distribution of fall armyworm subpopulations in different habitats are discussed.

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Section: Discussionsupporting

confidence: 75%

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confidence: 99%

The Fall Armyworm Triose Phosphate Isomerase (Tpi) Gene as a Marker of Strain Identity and Interstrain Mating

Nagoshi

2010

Annals of the Entomological Society of America

100

180

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“…Larvae collected from maize, sorghum, or cotton mostly represent one group (referred to as the "corn strain," or C), whereas larvae isolated from rice or various pasture grasses predominantly represent the other group (referred to as the "rice strain," or R; Pashley 1986). Because of their often tightly intermingled habitats and the ability of the rice strain to also utilize typical corn strain habitats to variable degrees, the two strains occur broadly sympatrically throughout South and North America (Meagher and Gallo-Meagher 2003;Prowell et al 2004;Nagoshi et al 2007;Machado et al 2008;Vélez-Arango et al 2008). No diagnostic morphological features have been described to distinguish these two strains, but they differ consistently in a number of physiological, developmental, and behavioral features (Pashley 1988;Pashley et al 1992Pashley et al , 1995Veenstra et al 1995;Meagher et al 2004;Groot et al 2008;Lima and McNeil 2009;Schöfl et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Allochronic Separation versus Mate Choice: Nonrandom Patterns of Mating between Fall Armyworm Host Strains

Schöfl

Dill²,

Heckel

et al. 2011

The American Naturalist

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Assortative mating may result from intrinsic individual mating preferences or from assortment traits not requiring expression of preferences. Assortment traits are phenotypes expressed in both sexes that enhance the probability of encountering individuals possessing similar trait values. In the noctuid moth Spodoptera frugiperda, it has been suggested that nonrandom mating between two host strains is caused by a temporal assortment trait-that is, differential timing of calling and copulation during the night. By experimental manipulation of this trait in controlled mate-choice experiments, we investigated whether mating by same-strain individuals is enhanced mainly by the allochronic shift of mating activity or is also affected by time-independent intrinsic mating preferences. The observed patterns suggest that nonrandom mating between the two host strains in the laboratory is shaped by an interaction of both effects that is dominated by mating preferences during the first encounter night. This interaction changes over time as the preferences become weaker on subsequent nights. Males were less restricted than females with regard to both the time shift in mating activity and mate preferences. Although the nature of the mate-preference mechanism remains elusive, its restriction to females suggests that male-produced close-range pheromones emitted during courtship play a role.

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“…Besides corn, two other C 4 plants, sorghum and sugarcane, are known to at least periodically have large corn-strain infestation levels (Hall et al 2005, Nagoshi et al 2007a). Both were tested for correlations with cotton infestation levels in the test region, though acreage of sugarcane was limited to a few locations in this area.…”

Section: Correlations Between Corn Acreage and Fall Armyworm Infestatmentioning

confidence: 99%

“…To date, the corn-strain is mostly associated with taller grasses such as corn, sorghum (Sorghum vulgare Pers. ), and sugarcane (Saccharum L.), and only rarely found in pasture and turf habitats (Pashley et al 1987, Hall et al 2005, Nagoshi et al 2007a). The rice-strain is preferentially found in shorter grasses such as rice, Oryza sativa L., and with pasture and turf grasses.…”

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confidence: 99%

Can the Amount of Corn Acreage Predict Fall Armyworm (Lepidoptera: Noctuidae) Infestation Levels in Nearby Cotton?

Nagoshi

2009

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Fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae), is a major pest of corn, Zea mays L., and a significant, but more sporadic, pest of cotton, Gossypium hirsutum L., in the Western Hemisphere. Previous studies showed that the cotton infestations primarily involve a fall armyworm subpopulation known as the "corn-strain" for which corn is the preferred host plant. It was suggested that the fall armyworm infesting cotton originated in corn and spread into secondary hosts as their numbers increased. In this study, high positive correlations were found between corn acreage and fall armyworm infestation levels in cotton. These occurred between areas that are either geographically close or along plausible migration pathways. Formulae were derived from scatter plot and linear regression analysis that can predict infestation levels in cotton based on corn acreage. The implications of these results for describing and predicting fall armyworm population movements are discussed.

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Identification and Comparison of Fall Armyworm (Lepidoptera: Noctuidae) Host Strains in Brazil, Texas, and Florida

Cited by 100 publications

References 2 publications

The Fall Armyworm Triose Phosphate Isomerase (Tpi) Gene as a Marker of Strain Identity and Interstrain Mating

The Fall Armyworm Triose Phosphate Isomerase (Tpi) Gene as a Marker of Strain Identity and Interstrain Mating

Allochronic Separation versus Mate Choice: Nonrandom Patterns of Mating between Fall Armyworm Host Strains

Can the Amount of Corn Acreage Predict Fall Armyworm (Lepidoptera: Noctuidae) Infestation Levels in Nearby Cotton?

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