Host Association of Spodoptera frugiperda (Lepidoptera: Noctuidae) Corn and Rice Strains in Argentina, Brazil, and Paraguay

Spodoptera frugiperda (J.E. Smith) is composed of two genetically distinct strains, the so-called corn strain and the rice strain. Whether the two strains differ in their host use is unclear, because laboratory experiments have not been able to show consistent host performance or preference differen...

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Bibliographic Details
Published in:Journal of economic entomology 2012-04, Vol.105 (2), p.573-582
Main Authors: Juárez, M. Laura, Murúa, M. Gabriela, García, M. Gabriela, Ontivero, Marta, Teresa Vera, M, Vilardi, Juan C, Groot, Astrid T, Castagnaro, Atilio P, Gastaminza, Gerardo, Willink, Eduardo
Format: Article
Language:English
Subjects:
Animals
Argentina
Biological and medical sciences
Brazil
Control
Crops
cytochrome oxidase I
Cytochrome-c oxidase
Differentiation
DNA, Mitochondrial - genetics
Electron Transport Complex IV - genetics
fall armyworm
Feeding Behavior
Fundamental and applied biological sciences. Psychology
Gene polymorphism
Generalities
Geographical variations
Grasses
Haplotypes
Host plants
host race
Insect Proteins - genetics
Insecta
Invertebrates
Larva - classification
Larva - genetics
Lepidoptera
Medicago sativa
Mitochondria
MOLECULAR ENTOMOLOGY
Noctuidae
Oryza sativa
Paraguay
PCR-restriction fragment-length polymorphism
Phytopathology. Animal pests. Plant and forest protection
Poaceae
Polymerase Chain Reaction
Polymorphism, Genetic
Polymorphism, Restriction Fragment Length
Protozoa. Invertebrates
Sequence Analysis, DNA
Sorghum
South America
Spodoptera - classification
Spodoptera - genetics
Spodoptera frugiperda
Sympatric populations
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Summary:Spodoptera frugiperda (J.E. Smith) is composed of two genetically distinct strains, the so-called corn strain and the rice strain. Whether the two strains differ in their host use is unclear, because laboratory experiments have not been able to show consistent host performance or preference differences between them, and field studies showed high rates of hybridization, as well as some degree asymmetric host use. To determine the distribution of the two strains and their association with host plants, we collected fall armyworm larvae from different crops (corn, rice, alfalfa, and sorghum) and grasses in 15 different localities over 4 yr in Argentina, Brazil, and Paraguay. The strain identity was analyzed using two polymorphisms in the mitochondrial cytochrome oxidase subunit I gene. We identified the corn and rice haplotypes and three types of populations were characterized based on the frequencies of the individuals that belonged to any of these haplotypes: in 44% of populations the corn haplotype predominated, in 44% of populations the rice haplotype was the most frequent, and 11% of populations showed both haplotypes at similar proportions. In total, eight populations (47%) showed the expected pattern, two populations (12%) were polymorphic within the same field, and seven populations (41%) showed the inverse pattern. Taken together, there was no consistent pattern of host association between the two sympatric genotypes and their respective host plants. This investigation supports the need for additional studies to determine which other forces keep the genotypes separate, and what is the degree of genetic differentiation between these populations.
ISSN:0022-0493
1938-291X
0022-0493
DOI:10.1603/EC11184