External Marking and Behavior of Early Instar Helicoverpa armigera (Lepidoptera: Noctuidae) on Soybean

Pannuti, Luiz E. R.; Baldin, Edson Luiz Lopes; Paula‐Moraes, Silvana V.; Hunt, Thomas E.; Canassa, Vinícius Fernandes; Bentivenha, José P. F.; Silva, Ivana F. da

doi:10.1653/024.102.0114

Cited by 4 publications

(4 citation statements)

References 37 publications

(43 reference statements)

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“…At 3 DAT, there were no significant differences among treatments, including controls, in numbers of infested chickpea pods. Most of the H. armigera larvae were still in the second instar at this time, a stage which feeds primarily on leaflets and may not yet be able to bore into pods (Fitt, 1989;Cherry, 2000;Pannuti et al, 2019). At 7 DAT, all treatments had fewer pods infested than controls.…”

Section: Discussionmentioning

confidence: 92%

Synergy between parasitoids and pathogens for biological control of Helicoverpa armigera in chickpea

Allahyari

Aramideh

Safaralizadeh

et al. 2019

Entomologia Exp Applicata

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The chickpea pod borer, Helicoverpa armigera H€ ubner (Lepidoptera: Noctuidae), is an important pest of many legume crops, including chickpea, Cicer arietinum L. (Fabaceae). We field-tested the efficacy of two pathogens, Helicoverpa armigera nucleopolyhedrosis virus (HaNPV) and Bacillus thuringiensis Berliner subsp. kurstaki (Btk), both alone and in combination with the parasitoid Habrobracon hebetor Say (Hh) (Hymenoptera: Braconidae), for control of H. armigera larvae in chickpea fields. A randomized complete block design was used at two sites, so that wasp release treatments at one site would not contaminate pathogen-only treatments at the other. Pathogens were applied when most pest larvae were in the second instar, and wasp releases were made 2 days later. Number of H. armigera larvae per plant, number of damaged pods, yield (kg ha À1 ), treatment cost (US$ ha À1 ), and benefit:cost ratio were all determined. Treatments separated significantly at 14 days after treatment, with the HaNPV+Hh and Btk+Hh treatments providing the best control, suggesting a synergistic impact of the wasp and the pathogens when applied together. These treatments also produced the fewest damaged pods, the highest yields, and the greatest yield increments in comparison to untreated controls. However, costs were also highest for these combined treatments, which reduced their net benefit in comparison to use of Hh or Btk alone, although more efficient mass production of the pathogens might make combined applications feasible. We conclude that both HaNPV and Btk are suitable for integration with releases of H. hebetor against H. armigera in chickpea fields, provided parasitoid releases are delayed until 2 days after pathogen application.

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Section: Discussionmentioning

confidence: 92%

Synergy between parasitoids and pathogens for biological control of Helicoverpa armigera in chickpea

Allahyari

Aramideh

Safaralizadeh

et al. 2019

Entomologia Exp Applicata

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“…Nonetheless, growers seem to be capable of successfully managing H. armigera despite the lack of control during the initial outbreak of this pest in Brazil 49 . In part, this may reflect the oviposition and feeding behavior of H. armigera females and larvae, respectively, on soybean plants, which exposes early‐instar larvae to management tools such as insecticidal sprays 50 . Females prefer laying on the underside of fully expanded leaves in the top 20 cm of the soybean canopy at all growth stages except during pod fill 51 .…”

Section: Discussionmentioning

confidence: 99%

“…Females prefer laying on the underside of fully expanded leaves in the top 20 cm of the soybean canopy at all growth stages except during pod fill 51 . Pannuti et al 50 . documented early‐instar H. armigera larvae feeding on soybean leaf tissue even when pods were available.…”

Section: Discussionmentioning

confidence: 99%

Host plant use of Helicoverpa spp. (Lepidoptera: Noctuidae) in the Brazilian agricultural landscape

Dourado¹,

Pantoja-Gomez

Horikoshi

et al. 2020

Pest Management Science

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BACKGROUND The Old‐World bollworm, Helicoverpa armigera (Hübner), was recently documented attacking cotton and soybean plants in Brazil; however, restricted basic knowledge on host plant interactions and landscape use in Brazil have limited the effectiveness of control measures. In this study, we evaluated the suitability of different crops commonly cultivated in Brazil as hosts for H. armigera and H. zea, and examined their contribution to the establishment and size of H. armigera and H. zea field populations. We also estimated the proportions of H. armigera and H. zea moths that used cotton, noncotton C3 plants, and C4 plants as hosts in four regions in Brazil through the length of the cropping season. RESULTS Viability of H. armigera larvae was highest on cotton (46.1%), followed by millet (39.5%), sorghum (31.2%), soybean (24.2%), and maize (21.1%). Noncotton C3 hosts served as the major source of H. armigera moths in all regions evaluated, and C4 hosts were a source of H. armigera mainly in regions where winter maize is typically cultivated. H. armigera moths that used cotton plants as natal hosts were observed during the reproductive stage of the crop mainly in the state of Bahia. Only C4 host plants were a consistent source of H. zea moths, primarily when maize was in the reproductive stage. H. armigera individuals were the main species infesting cotton and soybean fields while H. zea individuals were the main species infesting maize ears. CONCLUSIONS Regional differences in the host use and population dynamics of H. armigera among the regions evaluated may be attributed to variation in alternative host utilization (crops, noncrops, and weeds) and the possible occurrence of facultative diapause and or migration.

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“…Based on previous studies, movement of early instar lepidopteran larvae on host plants largely determines where feeding sites become established 17,[21][22][23] . Knowledge of on-plant movement also aids understanding of where the insects are throughout the day, when and where to sample, and when and how to treat when necessary, allowing the most e cacious spraying 11,16,[23][24][25] .…”

Section: Introductionmentioning

confidence: 99%

Larval movement of Anticarsia gemmatalis (Lepidoptera: Erebidae) on vegetative and reproductive stage non-Bt soybean

Ongaratto

Baldin

Hunt

et al. 2022

Preprint

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Integrated pest management (IPM) and insect resistance management (IRM) in a cropping system demands a comprehensive understanding of insect behavior, including larval movement. We evaluated the larval movement of velvetbean caterpillar, Anticarsia gemmatalis (Hübner), in a non-Bt soybean cultivar. Third to fifth instars were infested in different combinations in vegetative and reproductive soybean stages, and on-plant movement was characterized across select time points. The dispersion among plants in different positions and orientations was assessed by releasing 24-h-old larvae on the central plant of field plots. Results indicated that A. gemmatalis larvae are consistent in their movement during the day, regardless of plant section or leaf position. Over the time period of assessment, larvae gradually moved down and left the plant. Although there was not significant difference in the distance traveled by A. gemmatalis between orientations and positions, long distances were covered indicating that this species has nondirectional movement. This study provides relevant information regarding the movement of the velvetbean caterpillar, which can be used to improve insecticide spraying efficacy, improve probabilistic model predictive ability, and help design insect resistance management strategies.

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External Marking and Behavior of Early Instar Helicoverpa armigera (Lepidoptera: Noctuidae) on Soybean

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 4 publications

References 37 publications

Synergy between parasitoids and pathogens for biological control of Helicoverpa armigera in chickpea

Synergy between parasitoids and pathogens for biological control of Helicoverpa armigera in chickpea

Host plant use of Helicoverpa spp. (Lepidoptera: Noctuidae) in the Brazilian agricultural landscape

Larval movement of Anticarsia gemmatalis (Lepidoptera: Erebidae) on vegetative and reproductive stage non-Bt soybean

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