Oviposition preferences, Bt susceptibilities, and tissue feeding of fall armyworm (Lepidoptera: Noctuidae) host strains

Ingber, David A.; McDonald, John H.; Mason, Charles E.; Flexner, Lindsey

doi:10.1002/ps.6434

Cited by 11 publications

(12 citation statements)

References 83 publications

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“…The larvae of FAW can damage 353 species, 227 genera, and 76 families of plants [12]. Gramineous crops such as corn are their preferred hosts; domestic studies have shown that the FAW also feeds on oilseed rape, pepper, rapeseed, wild oat, sorghum, wheat, soybean, potato, and other vegetable crops [8,13]. The multi-host damage of FAW has caused serious economic loss to crops [14].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Gut Bacterial Communities of Fall Armyworm (Spodoptera frugiperda) Reared on Different Host Plants

Liu

Dong

et al. 2021

IJMS

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Spodoptera frugiperda is a highly polyphagous and invasive agricultural pest that can harm more than 300 plants and cause huge economic losses to crops. Symbiotic bacteria play an important role in the host biology and ecology of herbivores, and have a wide range of effects on host growth and adaptation. In this study, high-throughput sequencing technology was used to investigate the effects of different hosts (corn, wild oat, oilseed rape, pepper, and artificial diet) on gut microbial community structure and diversity. Corn is one of the most favored plants of S. frugiperda. We compared the gut microbiota on corn with and without a seed coating agent. The results showed that Firmicutes and Bacteroidetes dominated the gut microbial community. The microbial abundance on oilseed rape was the highest, the microbial diversity on wild oat was the lowest, and the microbial diversity on corn without a seed coating agent was significantly higher than that with such an agent. PCoA analysis showed that there were significant differences in the gut microbial community among different hosts. PICRUSt analysis showed that most of the functional prediction categories were related to metabolic and cellular processes. The results showed that the gut microbial community of S. frugiperda was affected not only by the host species, but also by different host treatments, which played an important role in host adaptation. It is important to deepen our understanding of the symbiotic relationships between invasive organisms and microorganisms. The study of the adaptability of host insects contributes to the development of more effective and environmentally friendly pest management strategies.

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Section: Introductionmentioning

confidence: 99%

Comparison of Gut Bacterial Communities of Fall Armyworm (Spodoptera frugiperda) Reared on Different Host Plants

Liu

Dong

et al. 2021

IJMS

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“…The significantly reduced egg mass numbers in the two-choice oviposition experiments indicates that conspecific feeding plays a dramatic role in fall armyworm oviposition preferences (Table 1). The published literature on damage-avoiding oviposition in female fall armyworms is limited, with four studies reporting significantly reduced oviposition on damaged corn plants compared with undamaged [22,23,25,26] and one reporting no differences [27]. Larval feeding on induced corn tissue resulted in significantly decreased head capsule widths compared to larvae that were fed control corn tissue (Table 1).…”

Section: Discussionmentioning

confidence: 99%

“…The strains are often differentiated from one another through their host preferences [62], though they are not absolute [62][63][64][65]. Several studies have identified differential tolerances in the fall armyworm host strains to several chemical insecticides [18,62,66] and Bt toxins [25,62,[67][68][69]. This is upheld by genetic data that depicts significant genetic variation between the corn and rice strains in nuclear and mitochondrial genes affecting detoxification, digestion, and chemoreception [70].…”

Section: Discussionmentioning

confidence: 99%

“…There is a report that larval feeding from the rice strain fall armyworm may induce greater concentrations of defensive compounds than corn strain larval feeding [71]. Therefore, follow up studies should include data on corn and rice strain fall armyworms (as well as corn-rice hybrids [25,67]) to further elucidate plant differential responses to host strain feeding.…”

Section: Discussionmentioning

confidence: 99%

“…In this context, the corn plants with less feeding damage were Bt plants, as they generally suffered lower degrees of herbivory due to the activity of their toxins (the presence of Bt does not appear to deter fall armyworm oviposition [24]). This deterrence also extends to mechanical damage [25]. The use of HIPVs to repel female oviposition could be a potential avenue to bolster existing technologies, extending their time of efficacy, or possibly serving as a stand-alone method of pest management.…”

Section: Introductionmentioning

confidence: 99%

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Detecting the Conspecific: Herbivory-Induced Olfactory Cues in the Fall Armyworm (Lepidoptera: Noctuidae)

et al. 2021

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The fall armyworm, Spodoptera frugiperda (Smith), is a polyphagous pest whose larval feeding threatens several economically important crops worldwide with especially severe damage to corn (Zea mays L.). Field-derived resistance to several conventional pesticides and Bt toxins have threatened the efficacy of current management strategies, necessitating the development of alternative pest management methods and technologies. One possible avenue is the use of volatile organic compounds (VOCs) and other secondary metabolites that are produced and sequestered by plants as a response to larval feeding. The effects of conspecific larval feeding on fall armyworm oviposition preferences and larval fitness were examined using two-choice oviposition experiments, larval feeding trials, targeted metabolomics, and VOC analyses. There was a significant preference for oviposition on corn plants that lacked larval feeding damage, and larvae fed tissue from damaged plants exhibited reduced weights and head capsule widths. All larval feeding promoted significantly increased metabolite and VOC concentrations compared to corn plants without any feeding. Metabolite differences were driven primarily by linoleic acid (which is directly toxic to fall armyworm) and tricarboxylic acids. Several VOCs with significantly increased concentrations in damaged corn plants were known oviposition deterrents that warrant further investigation in an integrated pest management context.

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Dynamics of gut microflora across the life cycle ofSpodoptera frugiperdaand its effects on the feeding and growth of larvae

Lü¹,

Dong²,

Yan³

et al. 2022

Pest Management Science

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BACKGROUND: Spodoptera frugiperda is an important invasive agricultural pest that causes huge economic losses worldwide. Gut microorganisms play a vital role in host feeding, digestion, nutrition, immunity, growth and insecticide resistance. Illumina high-throughput sequencing was used to study the gut microbial community dynamics across the life cycle (egg, 1st to 6th instar larvae, pupae, and male and female adults) of S. frugiperda fed on maize leaves. Furthermore, the gut microbial community and food intake of the 5th instar S. frugiperda larvae were studied after feeding them antibiotics.RESULTS: Enterobacteriaceae and Enterococcaceae dominated the gut during growth and feeding of the larvae. The relative abundance of Enterobacteriaceae was higher in the 4th and 6th instar larvae. With the increase in larval feeding, the relative abundance of Enterococcaceae gradually increased. In addition, principal coordinate analysis and linear discriminant effect size analysis confirmed differences in the structure of gut microbiota at different developmental stages. After antibiotic treatment, the relative abundance of Firmicutes, Proteobacteria and Fusobacteriota decreased. The relative abundance of Enterococcus and Klebsiella decreased significantly. Antibiotic treatment inhibited the gut flora of S. frugiperda, which decreased larval food intake and body weight gain, and prolonged the larval stage.CONCLUSION: The composition of the gut bacterial community plays an important role in the growth, development, and feeding of S. frugiperda. The results have a certain theoretical value for the development of bio-pesticides targeting intestinal flora.

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Oviposition preferences, Bt susceptibilities, and tissue feeding of fall armyworm (Lepidoptera: Noctuidae) host strains

Cited by 11 publications

References 83 publications

Comparison of Gut Bacterial Communities of Fall Armyworm (Spodoptera frugiperda) Reared on Different Host Plants

Comparison of Gut Bacterial Communities of Fall Armyworm (Spodoptera frugiperda) Reared on Different Host Plants

Detecting the Conspecific: Herbivory-Induced Olfactory Cues in the Fall Armyworm (Lepidoptera: Noctuidae)

Dynamics of gut microflora across the life cycle ofSpodoptera frugiperdaand its effects on the feeding and growth of larvae

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