Helicoverpa armigera and Helicoverpa zea hybridization: constraints, heterosis, and implications for pest management

Helicoverpa armigera and Helicoverpa zea hybridization: constraints, heterosis, and implications for pest management

BACKGROUND The invasion of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) into the New World has made it possible for this pest to hybridize with a native American species, H. zea (Boddie), under natural conditions. We investigated the viability and development of hybrids of these two Helico...

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Bibliographic Details
Published in:Pest management science Vol. 78; no. 3; pp. 955 - 964
Main Authors: Rios, Danielly AM, Specht, Alexandre, Roque‐Specht, Vânia F, Sosa‐Gómez, Daniel R, Fochezato, Júlia, Malaquias, Juaci V, Gonçalves, Gislene L, Moreira, Gilson RP
Format: Journal Article
Language:English
Published: Chichester, UK John Wiley & Sons, Ltd 01-03-2022
Wiley Subscription Services, Inc
Subjects:
agricultural pests
alien species
Animals
Chemical pest control
Fecundity
Female
Gene flow
Helicoverpa armigera
Heterosis
Humans
Hybrid Vigor
Hybridization
Hybridization, Genetic
Hybrids
Indigenous species
Insecticide resistance
Insecticides
Interspecific
introgression
Male
Moths - genetics
Pest Control
Pest outbreaks
Pest resistance
Pesticides
Pests
Population levels
Populations
reproductive parameters
Sex ratio
Zea mays
heterosis
agricultural pests
reproductive parameters
hybridization
introgression
alien species
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Summary:BACKGROUND The invasion of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) into the New World has made it possible for this pest to hybridize with a native American species, H. zea (Boddie), under natural conditions. We investigated the viability and development of hybrids of these two Helicoverpa species. We reared the parental species and evaluated crosses between H. armigera males and H. zea females and vice versa, two intercrosses between hybrids, and eight backcrosses between hybrids and parental species. We estimated the length of immature stages, fecundity, survival, sex ratio, and heterosis. RESULTS Although hybridization occcurred, with heterosis during the development of immatures, reproductive incompatibilities also were observed between the parental species and between hybrids from subsequent crosses. The interspecific crosses between hybrids and backcrosses confirmed the possibility of introgression events and their perpetuation in field populations. The results indicate that hybridization events are favored at high population levels, while at low population levels the ‘species identities’ will be maintained. CONCLUSIONS The possibility of interspecific gene flow and its perpetuation through successive crosses and backcrosses suggests several recommenations for management. Populations of both species should be maintained at an equilibrium level to reduce the chance of interspecific crosses, which are presumably more likely to occur during pest outbreaks. The existence of hybridization and resistance to different active pesticide ingredients should be monitored. All practices related to managing the resistance of these pests to chemical and biological insecticides should be systematized to reduce the chance of selecting for resistant individuals. Interspecific crosses between Helicoverpa armigera and H. zea, their hybrids and backcrosses confirm introgression and its perpetuation in field populations. Implications for adopting integrated pest management best practices are discussed. © 2021 Society of Chemical Industry.
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ISSN:1526-498X
1526-4998
DOI:10.1002/ps.6705