Female sex pheromones in the host races and hybrids of the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae)

Lima, Eraldo; McNeil, Jeremy N.

doi:10.1007/s00049-009-0005-y

Cited by 78 publications

(71 citation statements)

References 47 publications

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“…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). Using multilocus genotypes to examine the degree and directionality of hybridization between the fall armyworm strains in nature, Prowell et al (2004) concluded that up to 16% of the individuals sampled were potential hybrids, with many of those beyond the F 1 stage.…”

Section: Introductionmentioning

confidence: 99%

“…At this stage of the mating sequence, both males and females potentially can make a choice. In the fall armyworm, female pheromonal differences between the two strains have been described (Groot et al 2008;Lima and McNeil 2009), but their contribution to reproductive isolation remains to be tested. Male S. frugiperda possess eversible abdominal hair pencils and use them when approaching females (G. Schöfl, personal observation), but a male pheromone has not yet been identified.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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“…Strain-speciÞc differences in mating behavior have been observed, most notably in the timing during scotophase of female calling, male calling, and copulation (Pashley et al 1992, Schoß et al 2009). Recently, strain differences in the sex-pheromone emitted by the female were found, although there was disagreement about the speciÞc components involved (Groot et al 2008, Lima andMcNeil 2009). However, these mating barriers are not absolute, as hybridization between the two strains can be induced in the laboratory (Nagoshi et al 2006a(Nagoshi et al , 2008a, and it is estimated that Ϸ16% of the fall armyworm collected from Louisiana, Florida, Puerto Rico, Guadeloupe, and French Guiana from 1990 to 1992 were derived from interstrain hybridization (Prowell et al 2004).…”

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confidence: 99%

Improvements in the Identification of Strains Facilitate Population Studies of Fall Armyworm Subgroups

Nagoshi

2012

Annals of the Entomological Society of America

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Fall armyworm is a significant agricultural pest in the Western Hemisphere and an important system for studying Lepidopteran migration and speciation. Critical to these investigations are methods that can differentiate between two morphologically indistinguishable strains that differ in their choice of plant host. In a previous study, haplotypes of the fall armyworm Triose phosphate isomerase gene (Tpi; EC 5.3.1.1) were shown to be effective indicators of strain identity. However, the method had technical complications that made it expensive to apply on the scale needed for most population studies. The focus of this paper was to develop a more efficient and cost-effective procedure. By combining polymerase chain reaction (PCR) amplification and restriction enzyme digestion, a strain-specific polymorphism in the fall armyworm Tpi locus can be characterized from single specimens without the need of DNA sequencing. This method was more accurate under some circumstances than COI haplotyping, the current method of choice for population studies. The modified Tpi method was used to expand upon previous indications that interstrain hybridization occurs asymmetrically, to confirm observations of seasonal periodicity in the proportions of the two strains infesting Florida cornfields, and to demonstrate that certain instances where strain specificity to their host plants appeared to be compromised were because of variability in the association of the COI markers to strain identity. The results indicate that the application of both Tpi and COI analyses to the study of fall armyworm populations is now practical and should facilitate the mapping and study of fall armyworm subpopulations in the United States.

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“…Attempts to Þnd reproducible strain differences under controlled laboratory conditions have had some notable, but limited success. The two strains appear to differ in the timing of important aspects of mating behavior and in the components of the female sex pheromone (Pashley et al 1992, Groot et al 2008, 2010Lima and McNeil 2009;Schoß et al 2009;Groot et al 2010). There are also reports of strain differences in ovipositional substrates, developmental time and viability on various hosts, and mating preferences, though these have often not been in agreement (Pashley and Martin 1987, Whitford et al 1988, Quisenberry 1991, Veenstra et al 1995, Meagher et al 2004.…”

mentioning

confidence: 99%

Genetic Characterization of Fall Armyworm (Lepidoptera: Noctuidae) Host Strains in Argentina

Nagoshi¹,

Murúa²,

Hay-Roe³

et al. 2012

jnl. econ. entom.

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Fall armyworm is a major economic pest throughout the Western Hemisphere. Previous studies of populations in the southern United States, Brazil, and the Caribbean demonstrated the existence of two morphologically identical but genetically distinct host strains that can only be distinguished using genetic markers, including polymorphisms in the mitochondrial Cytochrome Oxidase I (COI) gene and in the Z-chromosome linked Triose phosphate isomerase (Tpi) gene. The strains differ in some physiological and behavioral characteristics, most notably their preference for different plant hosts, but are capable of hybridizing in the laboratory and in the field. These traits suggest that the strains are in the process of divergence, which may or may not be hemispheric in scope. The objective of this study was to determine whether the two strains are present in Argentina. It was found that the strain-diagnostic haplotypes of the COI and Tpi genes subdivided the Argentina population into two major groups. Each group displayed biases in their distribution among different host plants that were generally consistent with expected strain behavior. The overall results indicated that Argentina fall armyworm exhibit similar genetics and behavior to populations in the rest of the hemisphere. In addition, the Argentina populations had comparable haplotype frequencies to those from Brazil and Texas, consistent with possible interactions with these fall armyworm groups, but appeared to have had minimal exchanges with those from Puerto Rico or Florida.

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Female sex pheromones in the host races and hybrids of the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae)

Cited by 78 publications

References 47 publications

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

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

Improvements in the Identification of Strains Facilitate Population Studies of Fall Armyworm Subgroups

Genetic Characterization of Fall Armyworm (Lepidoptera: Noctuidae) Host Strains in Argentina

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