Experimental and theoretical landscape influences on Spodoptera frugiperda movement and resistance evolution in contaminated refuge areas of Bt cotton

Malaquias, José Bruno; Caprio, Michael A.; Godoy, Wesley Augusto Conde; Omoto, Celso; Ramalho, Francisco de Souza; Pachú, Jéssica K. S.

doi:10.1007/s10340-019-01145-1

Cited by 16 publications

(18 citation statements)

References 34 publications

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“…A question of interest to both researchers and cotton farmers in countries with the simultaneous occurrence of S. frugiperda and H. armigera species would be: What are the competition dynamics of these pests in cotton plants that do not express Bacillus thuringiensis (Bt), and which are used as refuge areas for Bt cotton? Based on the assumption that refuge areas are essential for the management of insect resistance to Bt technology, and as they aim at the large-scale production of individuals susceptible to Bt plants [26], a second question would be: How do the competition dynamics of these lepidopterans impact the production of individuals in those refuge areas?…”

Section: Introductionmentioning

confidence: 99%

Shifts in Ecological Dominance between Two Lepidopteran Species in Refuge Areas of Bt Cotton

Malaquias

Santana

Degrande

et al. 2021

Insects

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Competition behavior involving agricultural pest species has long been viewed as a powerful selective force that drives ecological and phenotypic diversity. In this context, a Game Theory-based approach may be useful to describe the decision-making dilemma of a competitor with impacts to guarantee its superiority in terms of ecological dominance or sharing of the food resource with its competitor. In an attempt to elucidate the consequences of competitive dynamics for the ecological dominance of these species in refuge areas of Bt cotton, we conducted a study that was divided into two parts. The first study consisted of an evaluation of interactions involving Spodoptera frugiperda (JE Smith, 1797) and Helicoverpa armigera (Hübner, 1808) on non-Bt cotton plants in a field trial. In the second study, we explored the data matrix collected in the field to parameterize a model of Cellular Automata (CA) with update rules inspired by Game Theory. Computer simulations were analyzed in hypothetical scenarios involving the application (or not) of insecticides in the refuge areas in combination with the resistance factor of one or both pest species to the insecticides used in the refuge areas. H. armigera had superior competitive performance in relation to S. frugiperda only at high densities. According to the density-mediated shift in dominance of the species, the resistance of S. frugiperda to insecticides is seen as a risk factor for the production of susceptible individuals of H. armigera on a large scale in the refuge areas. Additionally, S. frugiperda insecticide resistance may potentially impact the resistance evolution of the H. armigera population to Bt cotton. Thus, ecological dominance could diverge by the presence of a resistance allele to insecticides with interspecific competition perhaps subordinate to evolutionary processes.

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Section: Introductionmentioning

confidence: 99%

Shifts in Ecological Dominance between Two Lepidopteran Species in Refuge Areas of Bt Cotton

Malaquias

Santana

Degrande

et al. 2021

Insects

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“…The aphid Aphis gossypii Glover (Hemiptera: Aphididae) is a cotton-damaging pest [ 8 ] of cotton. and one of the most important non-target species of Bt cotton, which is a genetically modified variety expressing proteins derived from Bacillus thuringiensis (Berliner) (Bt), which gives them high efficiency against some lepidopteran species [ 9 , 10 ]. However, researchers have raised concerns about their potential impact on nontarget organisms such as aphids [ 11 ], and their stress on the Bt and non-Bt plant physiology [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Electrical signalling on Bt and non-Bt cotton plants under stress by Aphis gossypii

et al. 2021

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Plants have developed various mechanisms to respond specifically to each biotrophic attack. It has been shown that the electrical signals emitted by plants are associated with herbivory stress responses and can lead to the activation of multiple defences. Bt cotton is a genetically modified pest-resistant plant that produces an insecticide from Bacillus thuringiensis (Bt) to control Lepidopteran species. Surprisingly, there is no study–yet, that characterizes the signalling mechanisms in transgenic cotton plants attacked by non-target insects, such as aphids. In this study, we characterized the production of electrical signals on Bt and non-Bt cotton plants infested with Aphis gossypii and, in addition, we characterized the dispersal behaviour of aphids to correlate this behaviour to plant signalling responses. Electrical signalling of the plants was recorded with an extracellular measurement technique. Impressively, our results showed that both Bt and non-Bt cotton varieties, when attacked by A. gossypii, emitted potential variation-type electrical signals and clearly showed the presence of distinct responses regarding their perception and the behaviour of aphids, with evidence of delay, in terms of signal amount, and almost twice the amount of Cry1F protein was observed on Bt cotton plants at the highest density of insects/plant. We present in our article some hypotheses that are based on plant physiology and insect behaviour to explain the responses found on Bt cotton plants under aphid stress.

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“…O crescimento e o desenvolvimento do algodão (Gossypium hirsutum L.) podem ser afetados pelo ataque constante de lagartas (Malaquias et al, 2017a(Malaquias et al, , 2017b(Malaquias et al, , 2020 ou pulgões (Pachú et al, 2021a). Na cultura do algodão, são diversos os inimigos naturais que ocorrem predando (Pachú et al, 2018) ou parasitando (Pachú et al, 2018(Pachú et al, , 2021b pulgões.…”

Section: Introductionunclassified

Distribuição espacial de Lysiphlebus testaceipes (Cresson) (Hymenoptera: Aphidiidae) em algodoeiro cultivado em sistema adensado

Lima

Malaquias

Pachu³

et al. 2021

Científica

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No presente estudo foram avaliados os efeitos do adensamento do algodoeiro na distribuição espacial do parasitoide de afídeos Lysiphlebus testaceipes (Cresson) (Hymenoptera: Aphidiidae). Os três espaçamentos adotados foram: 0,40 m x 0,20 m (E1), 0,80 m x 0,20 m (E2) e 1,60 m x 0,20 m (E3). Foi utilizado o delineamento em blocos ao acaso com quatro repetições. Os resultados evidenciaram que o arranjo espacial de algodão modifica o padrão de dispersão de L. testaceipes. O parâmetro "b" da equação de Taylor foi superior à unidade nos espaçamentos: 0,40 m e 1,60 m, enquanto que em 0,80 m o valor de "b" foi inferior à unidade. Portanto, populações de L. testaceipes em condições de espaçamento entre linhas de 0,40 m e 1,60 m estão distribuídas de forma agregada, todavia se distribuindo de forma uniforme em 0,80 m. O modelo de Iwao revelou que para os espaçamentos: 0,80 m e 1,60 m existe uma tendência de repulsão dos indivíduos, pois os valores da constante "a" foram menores que 1. O modelo de Nachman se ajustou apenas para os dados populacionais em algodão cultivado em 0,80 m, portanto, para este sistema, planos que visam à estimativa do nível populacional de L. testaceipes podem ser baseados apenas em observações de presença/ausência, ao invés da contagem individual. Os resultados do presente estudo são relevantes para estratégias de liberação e conservação de L. testaceipes para controle biológico de populações de afídeos em algodão.

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Experimental and theoretical landscape influences on Spodoptera frugiperda movement and resistance evolution in contaminated refuge areas of Bt cotton

Cited by 16 publications

References 34 publications

Shifts in Ecological Dominance between Two Lepidopteran Species in Refuge Areas of Bt Cotton

Shifts in Ecological Dominance between Two Lepidopteran Species in Refuge Areas of Bt Cotton

Electrical signalling on Bt and non-Bt cotton plants under stress by Aphis gossypii

Distribuição espacial de Lysiphlebus testaceipes (Cresson) (Hymenoptera: Aphidiidae) em algodoeiro cultivado em sistema adensado

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