Biological parameters of Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) assayed with Bacillus thuringiensis berliner

Polanczyk, Ricardo Antônio; Alves, Sérgio Batista

doi:10.1590/s0103-90162005000500009

Cited by 16 publications

(3 citation statements)

References 8 publications

(10 reference statements)

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“…Modeling of the evolution of resistance to Bt under damage-avoiding oviposition has previously assumed that adults will prefer to lay eggs on conventional rather than Bt crops [ 28 ], perhaps because Bt and its toxins have been shown to deter larval feeding [ 29 , 30 ]. This earlier theoretical work is consistent with our results, in that resistance management improves as more eggs are laid in refugia [ 28 ].…”

Section: Discussionmentioning

confidence: 99%

Strong oviposition preference for Bt over non-Bt maize in Spodoptera frugiperda and its implications for the evolution of resistance

et al. 2014

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BackgroundTransgenic crops expressing Bt toxins have substantial benefits for growers in terms of reduced synthetic insecticide inputs, area-wide pest management and yield. This valuable technology depends upon delaying the evolution of resistance. The ‘high dose/refuge strategy’, in which a refuge of non-Bt plants is planted in close proximity to the Bt crop, is the foundation of most existing resistance management. Most theoretical analyses of the high dose/refuge strategy assume random oviposition across refugia and Bt crops.ResultsIn this study we examined oviposition and survival of Spodoptera frugiperda across conventional and Bt maize and explored the impact of oviposition behavior on the evolution of resistance in simulation models. Over six growing seasons oviposition rates per plant were higher in Bt crops than in refugia. The Cry1F Bt maize variety retained largely undamaged leaves, and oviposition preference was correlated with the level of feeding damage in the refuge. In simulation models, damage-avoiding oviposition accelerated the evolution of resistance and either led to requirements for larger refugia or undermined resistance management altogether. Since larval densities affected oviposition preferences, pest population dynamics affected resistance evolution: larger refugia were weakly beneficial for resistance management if they increased pest population sizes and the concomitant degree of leaf damage.ConclusionsDamaged host plants have reduced attractiveness to many insect pests, and crops expressing Bt toxins are generally less damaged than conventional counterparts. Resistance management strategies should take account of this behavior, as it has the potential to undermine the effectiveness of existing practice, especially in the tropics where many pests are polyvoltinous. Efforts to bring down total pest population sizes and/or increase the attractiveness of damaged conventional plants will have substantial benefits for slowing the evolution of resistance.

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Section: Discussionmentioning

confidence: 99%

Strong oviposition preference for Bt over non-Bt maize in Spodoptera frugiperda and its implications for the evolution of resistance

et al. 2014

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“…Interestingly, the effects we have characterized here are reminiscent of those observed on the target organisms Helicoverpa armigera and H. zea , Spodoptera frugiperda and Choristoneura fumiferana . Indeed, when fed with sublethal doses of Btk spores, all these target organisms display developmental delays and/or reduced pupal size [ 5 , 77 , 78 , 79 ]. Moreover, recent work has also shown that the potent pathogens P. entomophila and P. aeruginosa or huge amounts of the opportunistic bacterium Erwinia carotovora carotovora induce developmental delays and growth defects in Drosophila larvae [ 80 ].…”

Section: Discussionmentioning

confidence: 99%

Bacillus thuringiensis Bioinsecticides Induce Developmental Defects in Non-Target Drosophila melanogaster Larvae

Nawrot-Esposito

Babin

Pasco

et al. 2020

Insects

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Bioinsecticides made from the bacterium Bacillus thuringiensis (Bt) are the bestselling bioinsecticide worldwide. Among Bt bioinsecticides, those based on the strain Bt subsp. kurstaki (Btk) are widely used in farming to specifically control pest lepidopteran larvae. Although there is much evidence of the lack of acute lethality of Btk products for non-target animals, only scarce data are available on their potential non-lethal developmental adverse effects. Using a concentration that could be reached in the field upon sprayings, we show that Btk products impair growth and developmental time of the non-target dipteran Drosophila melanogaster. We demonstrate that these effects are mediated by the synergy between Btk bacteria and Btk insecticidal toxins. We further show that Btk bioinsecticides trigger intestinal cell death and alter protein digestion without modifying the food intake and feeding behavior of the larvae. Interestingly, these harmful effects can be mitigated by a protein-rich diet or by adding the probiotic bacterium Lactobacillus plantarum into the food. Finally, we unravel two new cellular mechanisms allowing the larval midgut to maintain its integrity upon Btk aggression: First the flattening of surviving enterocytes and second, the generation of new immature cells arising from the adult midgut precursor cells. Together, these mechanisms participate to quickly fill in the holes left by the dying enterocytes.

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“…Among the alternatives to control S. frugiperda, the use of Bacillus thuringensis (Bt) has been the subject of interest because of its effectiveness in controlling the pest and its low impact on natural enemies (Polanczyk and Alves, 2005). Studies have shown that Bt affects biological parameters with a definite influence on the weight of larvae, pupae, oviposition and fecundity of S. frugiperda females (Polanczyk and Alves, 2005). Bt Cry protein has been effectively used in America for the control of S. frugiperda but resistance of the pest against this protein has been noted (Farias et al, 2014;Dangal and Huang, 2015).…”

Section: Control Using Entomopathogenic Bacteria Nematodes and Virusesmentioning

confidence: 99%

Fall armyworm, Spodoptera frugiperda (Lepidoptera, Noctuidae): State of knowledge and control methods

Adjaoke¹,

Adandonon²,

Yotto³

2021

Afr. J. Agric. Res.

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The objective of this article is to review the knowledge on Spodoptera frugiperda and the possible management strategies against the pest to identify research areas for its integrated management. A review of the literature shows that S. frugiperda (Lepidoptera: Noctuidae) has been causing considerable damage to maize and many other crops since its detection in several African countries and it is one of the most destructive pests to have entered Africa in the 21st century. Several control methods have been developed against this pest ranging from the use of synthetic plant protection products to agroecological and biological controls. The biology, distribution and control methods of the pest are well documented. However, Integrated Management of the pest remains a major challenge; the main control is chemical. Innovative research on biological and ecological control methods will help to overcome the constraints and promote sustainable management of the pest. Very few scientifically proven alternatives adapted to the African context exist. This gap needs to be filled by further research considering aspects such as the inventory of local natural enemies, the performance of key parasitoids and the potential of local entomopathogens for sustainable and integrated management of the pest.

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Biological parameters of Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) assayed with Bacillus thuringiensis berliner

Cited by 16 publications

References 8 publications

Strong oviposition preference for Bt over non-Bt maize in Spodoptera frugiperda and its implications for the evolution of resistance

Strong oviposition preference for Bt over non-Bt maize in Spodoptera frugiperda and its implications for the evolution of resistance

Bacillus thuringiensis Bioinsecticides Induce Developmental Defects in Non-Target Drosophila melanogaster Larvae

Fall armyworm, Spodoptera frugiperda (Lepidoptera, Noctuidae): State of knowledge and control methods

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