Imidacloprid-mediated stress on non-Bt and Bt cotton, aphid and ladybug interaction: Approaches based on insect behaviour, fluorescence, dark respiration and plant electrophysiology

Pachú, Jéssica K. S.; Macedo, F C O; Silva, Fábia B da; Malaquias, José Bruno; Ramalho, Francisco de Souza; Oliveira, Ricardo Ferraz de; Godoy, Wesley Augusto Conde

doi:10.1016/j.chemosphere.2020.127561

Cited by 15 publications

(16 citation statements)

References 52 publications

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“…The natural predation could also provide efficient resistance management with high refuge size because of strong density-dependent mortality [47]. Therefore, to meet the concept of sustainable management in refuge areas, experimental and modelling studies considering other control tactics available to manage lepidopteran species and other pest species, such as applied biological control [48], may be more pertinent.…”

Section: Discussionmentioning

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: Discussionmentioning

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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“…In our research, the ballooning frequency of Cry1F‐resistant larvae found in a treatment with non‐Bt cotton as a natal plant and Bt cotton as adjacent plants was two‐fold lower compared to when Bt cotton was the natal plant and non‐Bt cotton was in the adjacent sites. Host‐plant selection by S. frugiperda Cry1F‐resistant and susceptible populations based on ballooning dispersal to avoid non‐Bt and Bt cotton plants, respectively, may be attributed to differences in terms of biochemical (Carbonari et al, 2016) or electrophysiological (Pachu et al, 2020) differences between non‐Bt and Bt cotton plants. In spiders, Morley & Robert (2018) observed the capacity to detect electric fields, and some atmospheric electrostatics provided enough force for dispersal by ballooning.…”

Section: Discussionmentioning

confidence: 99%

Evolutionary process modeling with Bayesian inference of Spodoptera frugiperda ballooning and walking dispersal in Bt and non‐Bt cotton plant mixtures

Malaquias¹,

Godoy²,

Caprio

et al. 2021

Entomologia Exp Applicata

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Transgenic crops expressing Bacillus thuringiensis Berliner (Bt) have been cultivated throughout the world as a great technological tool for developing integrated pest management. We hypothesized that artificial landscapes containing Bt and non‐Bt cotton plants (Gossypium hirsutum L., Malvaceae) at small scales could influence dispersal by ballooning of Spodoptera frugiperda (JE Smith) (Lepidoptera: Noctuidae). We also simulated how ballooning dispersal combined with walking movement could impact resistance evolution in various scenarios of plant mixtures involving non‐Bt and Bt cotton plants with high‐dose and low‐dose events. The ballooning frequency of Cry1F‐resistant larvae in a treatment with non‐Bt cotton as a natal plant and Bt cotton in adjacent sites was two‐fold lower compared to when Bt cotton was the natal plant and non‐Bt cotton was in the adjacent sites. Our model results suggested that the higher rate of walking movement associated with ballooning promoted faster resistance evolution in low‐dose events, and contamination of Bt cotton fields with non‐Bt cotton plants in a high‐dose event showed the longest time to resistance. Therefore, a high rate of walking movement associated with ballooning negatively impacted the time for resistance to evolve in low‐dose events.

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“…[72][73][74] These cause high levels of mortality in susceptible and heterozygous larvae, even when initially fed with non-Bt corn for a period of 10 days, 65 and have a high effectiveness in the field. 37 Studies that aim to understand larval movement between plants and the interactions with other trophic levels, 22,26 such as other pest species 75 and Bt plant physiology, 76 are necessary to predict the consequences on resistance evolution. This should allow more informed recommendations for the intercropping of ruzigrass with Bt or non-Bt corn.…”

Section: Discussionmentioning

confidence: 99%

Intercropped Bt and non‐Bt corn with ruzigrass (Urochloa ruziziensis) as a tool to resistance management of Spodoptera frugiperda (JE Smith, 1797) (Lepidoptera: Noctuidae)

Jacques

Degrande

Gauer

et al. 2021

Pest Management Science

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BACKGROUND: Corn intercropped with ruzigrass is common in Brazil, and it can improve the physicochemical features of soils, increase water retention, and suppress the emergence of resistant weeds and soil nematodes. As both corn and ruzigrass are hosts to Spodoptera frugiperda (the main corn pest in South America), the cultivation of both these plants in the same place at one time motivates investigation into the pest population dynamics. We hypothesize that the intercropping system influences S. frugiperda pressure and leaf injury in corn. Considering that if corn hybrids with high dose toxin expression are used, ruzigrass may be a potential host to susceptible S. frugiperda larvae, consequently an alternative refuge and be included as a tool for the resistant management of Bt corn. To test these hypotheses about the use of ruzigrass as an alternative host of S. frugiperda in an intercropping system with corn, we conducted field trials in three seasons to verify S. frugiperda population dynamics and leaf injury to crop systems. In addition to phenotypic evaluation, we also characterized molecularly S. frugiperda strains collected in corn and ruzigrass to identify strain differences.RESULTS: The insects collected in both corn and ruzigrass were identified as corn strains. Ruzigrass was used as a S. frugiperda host during all crop cycles. The intercropped system did not increase the S. frugiperda population or leaf injury on Bt corn. CONCLUSION:The results suggest that the intercropped system is not prejudicial to Bt corn cultivation since high dose concept applies to all larvae instars. The results also suggest that ruzigrass may be used as a promising alternative refuge in Bt corn agroecosystems, if compliance with management strategies is followed.

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Imidacloprid-mediated stress on non-Bt and Bt cotton, aphid and ladybug interaction: Approaches based on insect behaviour, fluorescence, dark respiration and plant electrophysiology

Cited by 15 publications

References 52 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

Evolutionary process modeling with Bayesian inference of Spodoptera frugiperda ballooning and walking dispersal in Bt and non‐Bt cotton plant mixtures

Intercropped Bt and non‐Bt corn with ruzigrass (Urochloa ruziziensis) as a tool to resistance management of Spodoptera frugiperda (JE Smith, 1797) (Lepidoptera: Noctuidae)

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