The Corn Earworm Complex

Hardwick, David F.

doi:10.4039/entm9740fv

Cited by 263 publications

(352 citation statements)

References 51 publications

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“…Otherwise, if the larva is in a molting stage, it is less aggressive and its mobility is decreased, so an intermolting larva is vulnerable to be predated or cannibalized (Dial and Adler 1990). In addition, both species might pass through more than one generation in maize (Cruz and Turpin 1983;Cunningham and Zalucki 2014), and might cohabit in other important crops, such as soybean and cotton (Hardwick 1965;Barros et al 2010;Malaquias et al 2015), which increases the importance of host plant as a relevant factor for infestation, prevalence, and interaction of the species.…”

Section: Discussionmentioning

confidence: 99%

Attack and defense movements involved in the interaction of Spodoptera frugiperda and Helicoverpa zea (Lepidoptera: Noctuidae)

et al. 2016

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The fall armyworm, Spodoptera frugiperda (J. E. Smith) and the corn earworm, Helicoverpa zea (Boddie) are among the main pests of maize. Both species exhibit cannibalistic behavior and quite often share the same feeding guild in maize (maize ears), which can result in several interspecific and intraspecific interactions. Paired interaction scenarios of intraspecific and interspecific larvae were assessed in arenas in the presence and absence of food to characterize movements resulting from interactions of these insects. There was a difference in the frequency of behavioral movements in all the interactions, except for S. frugiperda in the presence of food. Head touching and recoiling were the predominant movements in most of the interaction scenarios. Spodoptera frugiperda exhibited a predominance of defensive movements when competing against H. zea in the same instars. Cannibalism and predation occurred frequently in interactions involving 6th instar of H. zea against opponents in 4th instar. Larvae of H. zea show a higher aggressive movement than S. frugiperda. The larvae of S. frugiperda take advantage during the interactions, although they present more defensive movements compared to H. zea. This study provides relevant information regarding the interaction of these species and intraguild interaction, which might influence the population dynamics and the competitive displacement of pest species that share the same ecological niche. Keywords: Intraguild interaction, Ethogram, Fall armyworm, Corn earworm, Aggressive Key message• The intraguild interactions of fall armyworm and corn earworm are still unclear; moreover they exhibit cannibalistic/ predation behavior and may share the same feeding niche in maize. Our studies have indicated the main movements in interactions between these species.• Fall armyworm took advantage of corn earworm during the contests, although it presented more defensive movements. • This is relevant information for population dynamics, displacement of species, and it has implications for transgenic maize insect resistance management strategies for these species.

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Section: Discussionmentioning

confidence: 99%

Attack and defense movements involved in the interaction of Spodoptera frugiperda and Helicoverpa zea (Lepidoptera: Noctuidae)

et al. 2016

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“…In Paraguay, the presence of H. armigera has previously been reported based on morphological characterization (Senave, 2013). However, due to the difficulty of species identification among closely related congeners (e.g., H. zea, Hardwick, 1965;Pogue, 2004), confirmation using molecular characterization would also be desirable. The results presented here represent the first insight into genetic diversity of H. armigera in Paraguay.…”

Section: Discussionmentioning

confidence: 99%

Mitochondrial DNA COI characterization of Helicoverpa armigera (Lepidoptera: Noctuidae) from Paraguay and Uruguay

Arnemann¹,

James²,

Walsh³

et al. 2016

Genet. Mol. Res.

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ABSTRACT. Since its detection in Brazil in 2013, the Old World cotton bollworm Helicoverpa armigera has been reported in Argentina, Paraguay, and Bolivia. Here we present evidence extending the South American range of H. armigera to Uruguay, using polymerase chain reaction and sequencing of the partial mitochondrial DNA (mtDNA) cytochrome oxidase I region. Molecular characterization of this gene region from individuals from Paraguay also supports previous morphological identification of H. armigera in Paraguay. Shared mtDNA haplotypes in H. armigera from Brazil, Uruguay, and Paraguay were identified. Additional surveying of populations in this region will be imperative to better monitor and understand factors that are underpinning its presence and successful adaptation in these South American regions. We discuss our findings with respect to the development of resistance pest management strategies of this invasive insect pest in a predominantly monoculture soybean crop landscape in the Southern Cone region.

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“…Adult external (pattern and color of wings) and internal (morphology of male genital organ) characters were considered for the identification process (Hardwick 1965, Pogue 2004. Genital organs were ground in a potassium hydroxide solution (10%) and mounted on microscope slides, which were deposited in the Becker Collection and identified as VOB5225 and VOB5226.…”

Section: Research Notementioning

confidence: 99%

Primeiro registro de ocorrência de Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) no Brasil

Czepak

Albernaz

Vivan

et al. 2013

Pesqui. Agropecu. Trop.

267

212

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The Corn Earworm Complex

Cited by 263 publications

References 51 publications

Attack and defense movements involved in the interaction of Spodoptera frugiperda and Helicoverpa zea (Lepidoptera: Noctuidae)

Attack and defense movements involved in the interaction of Spodoptera frugiperda and Helicoverpa zea (Lepidoptera: Noctuidae)

Mitochondrial DNA COI characterization of Helicoverpa armigera (Lepidoptera: Noctuidae) from Paraguay and Uruguay

Primeiro registro de ocorrência de Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) no Brasil

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