Flutuação Populacional de Spodoptera frugiperda (J. E. Smith), Diatraea saccharalis (Fabricius) e Doru luteipes (Scudder) em Milho Convencional e Transgênico BT

Araújo, L. F. de; Silva, Alessandro Guerra da; Cruz, Ivan; Carmo, Eduardo Lima do; Neto, Adalbert Horvath; Goulart, Maria Mirmes Paiva; Rattes, Jurema Fonseca

doi:10.18512/1980-6477/rbms.v10n3p205-214

Cited by 14 publications

(6 citation statements)

References 10 publications

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“…Murúa et al (2013) showed that regardless of the treatment when evaluating the maize throughout the vegetative state, the authors ensured that in the transgenic Herculex®, the plants remained undamaged or with "pin-hole" type lesions in the leaves. Furthermore, De Araujo et al (2012) concluded that the hybrid P 3041YG showed lower damage by S. frugiperda showing a higher biomass and grain yield in comparison with the conventional hybrid P 3041.…”

Section: Calculation Of the Action Thresholdmentioning

confidence: 99%

Economic injury level and action thresholds for Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) in maize crops

Jaramillo-Barrios

Varón-Devia

Monje-Andrade

2020

Rev. Fac. Nac. Agron. Medellín

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Spodoptera frugiperda (J.E. Smith) is the pest insect that produces the highest losses in maize production in the tropics and neotropics. Its control in Colombia comprises about 10% of the total production costs. The aim of this study was to determine the economic injury level (EIL) and define action thresholds (ATs) for this insect pest in the maize hybrids 30F35R and 30F35HR (with Cry1F protein) in Espinal, Colombia. In two sowing cycles, a completely randomized design was established for each maize hybrid to measure their yield response at four insect population levels (a control without any applications of insecticides and applications at 2, 5, and 10 larvae per 10 plants). For 30F35R, an inverse relationship was found between levels of infestation and yields; meanwhile, for 30F35HR, only during the first cycle this relationship was found. The EIL calculated for 30F35R showed an average of 2.6 and 1.9 larvae per 10 plants in the first and second cycles, respectively, and 2.8 for 30F35HR in the first cycle. Two ATs were established, one in the period from 0 to 20 days after emergence (DAE) and another from 20 to 40 DAE. The threshold for 30F35R from 0 to 20 DAE showed an average of 1.8 larvae per 10 plants in both cycles, while, from 20 to 40 DAE, it was 2.0 and 1.7 in the first and second cycles, respectively. In 30F35HR, the thresholds were 2.1 and 2.5 larvae per 10 plants on average for both periods of the first cycle, respectively. These results can be considered as a tool within integrated pest management that also includes biological and cultural control strategies.

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Section: Calculation Of the Action Thresholdmentioning

confidence: 99%

Economic injury level and action thresholds for Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) in maize crops

Jaramillo-Barrios

Varón-Devia

Monje-Andrade

2020

Rev. Fac. Nac. Agron. Medellín

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“…The authors concluded that MON810 maize was effective in protecting the crop against infestations and damages by S. frugiperda. Araújo et al (2011) observed that the transgenic maize hybrid P3041YG presented a lower damage caused by S. frugiperda, higher grain mass per ear, and higher grain yield in relation to the conventional hybrid. Waquil et al (2014) evaluated the efficacy of the pyramidal event MON 89034, which expresses the proteins Cry1A.105 and Cry2Ab2, for the control of Spodoptera frugiperda, Helicoverpa spp.…”

Section: Introductionmentioning

confidence: 91%

Agronomic parameters and morpho-agronomic characteristics of genetically modified maize hybrids compared to conventional maize hybrids

2020

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The objectives were to study the behavior of fifteen pre-commercial upland maize hybrids, analyze their agronomic performance regarding grain yield, and evaluate productivity components, as well as morpho-agronomic characteristics, in the Midwest Region of Brazil. Two experiments were conducted in the municipalities of Formosa-GO and Planaltina-DF, 2016/17 crop year. Both consisted of five pre-commercial maize hybrid platforms (HPA252, HPB262, HPB621, HPB646, and HPD354). Each platform consisted of three different versions: conventional, transgenic with a Bt gene that expresses the protein Cry1F, and transgenic with two Bt genes that express the proteins Cry1F and Cry1AB. The experiment was randomized blocks with four replications. The experimental plot was four lines five meters long considering the two central lines as useful. The lines were spaced 0.75 meters apart, and the final density was five plants per linear meter. To estimate grain yield, the plots were harvested, and the weight was extrapolated to kg.ha-1. The moisture was standardized at 14%. Data were submitted to analysis of variance, and the means were compared by Tukey test at 5% probability using the Sisvar software. Grain yield between treatments ranged from 8,381 to 12,908 kg.ha-1, and the average yield was 11,234 kg.ha-1. The parameters evaluated were divided into two groups. The first group contained parameters determining grain yield: grain depth, thousand grains weight, number of rows of grains, number of grains per row, and grain yield. The second group contained morpho-agronomic parameters that directly interfere with resistance to lodging and plant breaking: plant height, ear insertion height, and mean stem diameter. There was no direct effect of the transgenes on the evaluated hybrids since the classification of productivity was not divided into conventional and transgenic classes. It is suggested that the HPA252YH, HP621H and HP646H versions be discarded because grain yield performance was unsatisfactory compared to their respective conventional and transgenic counterparts. The parameters GD and W1000 are more effective for grain yield estimation than NR and NG. It was observed for HP621H that, in addition to a lower grain yield, there was a significant reduction in stem diameter, indicating a possible reduction in lodging tolerance and/or plant breaking when exposed to adverse climatic conditions such as windstorms. For the HPD354H version, the release of the transgenic counterpart HPD354YH is preferentially indicated since the H version had a significant reduction in stem diameter and a possible greater tolerance to lodging and/or plant breaking under the same conditions.

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“…The differences between populations with and without the Cry1F protein gene agrees with what was reported by Hardke et al (2011), who indicated that the Cry1F endotoxin showed significant reductions in leaf lesions and lower survival compared to corn tissue without Bt. Likewise, Araujo et al (2012) concluded that the hybrid P 3041YG showed lower damage from S. frugiperda, showing a higher biomass and grain yield compared to the conventional hybrid P 3041.…”

Section: Comparison Of Larval Accumulation For the Periods Year And mentioning

confidence: 99%

Populations of Spodoptera frugiperda (Lepidoptera: Noctuidae) cause significant damage to genetically modified corn crops

Jaramillo-Barrios

Quijano

Andrade

2019

Rev. Fac. Nac. Agron. Medellín

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The fall armyworm (Spodoptera frugiperda (J.E. Smith)) is an important harmful pest for corn crops in Colombia. Knowing its population’s fluctuation regarding genetically modified plants allows the implementation of monitoring plans and time-effective management actions. The objective of this study was to establish the population’s fluctuation of S. frugiperda during 2014-2016 in the hybrids 30F35R and 30F35HR (genetically modified with the Cry1F endotoxin) in El Espinal, Tolima, Colombia. Accumulations in five growing cycles were carried out until 20, 40, 60, 80, and 104 days with the number of larvae per linear meter after emergence per year and per hybrid. Results were compared statistically using linear mixed models. On the other hand, two dummy variables that reckon the presence of larvae and damage were calculated. With the indicators of presence (one) and absence (zero), a longitudinal logistic prediction model was constructed. Larger accumulation of larvae was registered in the hybrid 30F35R (6.79±0.20); however, the genetically modified genotype 30F35HR also registered the presence of larvae (4.24±0.20), inferring that the endotoxin did not exercise total control over the populations. The vegetative stage showed a higher larval population. However, when this stage is not managed, the crop can show damage up to 52% and 72% in hybrid plants with and without Cry1F, respectively. This behavior suggests that if refuge areas and strategies such as pest monitoring are not established, these insects could generate higher resistances to the plants with the endotoxin Cry1F.

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Flutuação Populacional de Spodoptera frugiperda (J. E. Smith), Diatraea saccharalis (Fabricius) e Doru luteipes (Scudder) em Milho Convencional e Transgênico BT

Cited by 14 publications

References 10 publications

Economic injury level and action thresholds for Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) in maize crops

Economic injury level and action thresholds for Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) in maize crops

Agronomic parameters and morpho-agronomic characteristics of genetically modified maize hybrids compared to conventional maize hybrids

Populations of Spodoptera frugiperda (Lepidoptera: Noctuidae) cause significant damage to genetically modified corn crops

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