Regional and seasonal activity predictions for fall armyworm in Australia

Maino, James L.; Schouten, Rafael; Overton, Kathy; Day, Roger; Ekesi, Sunday; Bett, Bosibori; Barton, Madeleine; Gregg, Peter; Umina, Paul A; Reynolds, Olivia L.

doi:10.1016/j.cris.2021.100010

Cited by 40 publications

(33 citation statements)

References 60 publications

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“…It rapidly established across tropical and subtropical regions of Australia including north Queensland, Northern Territory, and northern parts of Western Australia. Predictions suggest that S. frugiperda populations are likely to persist year-round throughout cropping regions of northern Australia with seasonal migrations from this permanent range likely to extend into more southerly agricultural regions [9] where they are likely to produce multiple and overlapping generations per year [10,11] across a broad host range throughout vegetative and reproductive stages of crop development [12]. A further challenge is that larvae become concealed in protected feeding sites such as the whorls and ears of plants which makes chemical control difficult to achieve.…”

Section: Introductionmentioning

confidence: 99%

Insecticide resistance in Australian Spodoptera frugiperda (J.E. Smith) and development of testing procedures for resistance surveillance

Bird

Miles²,

Quade³

et al. 2022

PLoS ONE

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Spodoptera frugiperda (J.E. Smith) is a highly invasive noctuid pest first reported in northern Australia during early 2020. To document current status of resistance in S. frugiperda in Australia, insecticide toxicity was tested in field populations collected during the first year of establishment, between March 2020 and March 2021. Dose-response was measured by larval bioassay in 11 populations of S. frugiperda and a susceptible laboratory strain of Helicoverpa armigera. Emamectin benzoate was the most efficacious insecticide (LC50 0.023μg/ml) followed by chlorantraniliprole (LC50 0.055μg/ml), spinetoram (LC50 0.098μg/ml), spinosad (LC50 0.526μg/ml), and methoxyfenozide (1.413μg/ml). Indoxacarb was the least toxic selective insecticide on S. frugiperda (LC50 3.789μg/ml). Emamectin benzoate, chlorantraniliprole and methoxyfenozide were 2- to 7-fold less toxic on S. frugiperda compared with H. armigera while spinosyns were equally toxic on both species. Indoxacarb was 28-fold less toxic on S. frugiperda compared with H. armigera. There was decreased sensitivity to Group 1 insecticides and synthetic pyrethroids in S. frugiperda compared with H. armigera: toxicity was reduced up to 11-fold for methomyl, 56 to 199-fold for cyhalothrin, and 44 to 132-fold for alpha cypermethrin. Synergism bioassays with metabolic inhibitors suggest involvement of mixed function oxidase in pyrethroid resistance. Recommended diagnostic doses for emamectin benzoate, chlorantraniliprole, spinetoram, spinosad, methoxyfenozide and indoxacarb are 0.19, 1.0, 0.75, 6, 12 and 48μg/μl, respectively.

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Section: Introductionmentioning

confidence: 99%

Insecticide resistance in Australian Spodoptera frugiperda (J.E. Smith) and development of testing procedures for resistance surveillance

Bird

Miles²,

Quade³

et al. 2022

PLoS ONE

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“…It is considered a polyphagous species, being variously reported on 100–300 odd host plants from at least 27 families [ 42 , 43 ]. The species has invaded Africa, Asia and Australia and spread rapidly within all these continents, triggering serious agricultural production and economic losses [ 43 , 44 , 45 , 46 , 47 , 48 ]. Even though S. frugiperda is considered a single species two-host plant-related strains have been described; a Corn strain (CS) that prefers to feed on maize (corn) and sorghum, and a Rice strain (RS) that feeds on rice and in particular Bermuda grass (Ribeiro et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Behavioral and Physiological Plasticity Provides Insights into Molecular Based Adaptation Mechanism to Strain Shift in Spodoptera frugiperda

Hafeez

Ullah

et al. 2021

IJMS

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How herbivorous insects adapt to host plants is a key question in ecological and evolutionary biology. The fall armyworm, (FAW) Spodoptera frugiperda (J.E. Smith), although polyphagous and a major pest on various crops, has been reported to have a rice and corn (maize) feeding strain in its native range in the Americas. The species is highly invasive and has recently established in China. We compared behavioral changes in larvae and adults of a corn population (Corn) when selected on rice (Rice) and the molecular basis of these adaptational changes in midgut and antennae based on a comparative transcriptome analysis. Larvae of S. frugiperda reared on rice plants continuously for 20 generations exhibited strong feeding preference for with higher larval performance and pupal weight on rice than on maize plants. Similarly, females from the rice selected population laid significantly more eggs on rice as compared to females from maize population. The most highly expressed DEGs were shown in the midgut of Rice vs. Corn. A total of 6430 DEGs were identified between the populations mostly in genes related to digestion and detoxification. These results suggest that potential adaptations for feeding on rice crops, may contribute to the current rapid spread of fall armyworm on rice crops in China and potentially elsewhere. Consistently, highly expressed DEGs were also shown in antennae; a total of 5125 differentially expressed genes (DEGs) s were identified related to the expansions of major chemosensory genes family in Rice compared to the Corn feeding population. These results not only provide valuable insight into the molecular mechanisms in host plants adaptation of S. frugiperda but may provide new gene targets for the management of this pest.

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“…The Asian corn borer (Ostrinia furnacalis), which is widely present in East and Southeast Asia, Australia, and the Western Pacific Islands, is a destructive pest of maize (Zea mays) [10]. The O. furnacalis larvae feed on nearly all tissues of maize and have caused Toxins 2021, 13, 658 2 of 14 severe yield losses ranging from 10% to 100% to maize in some countries of the Asian-Western Pacific region [10]. Feeding damage by the insect pest increases fungal infestation, which further influences the quality and commodity value of maize [11].…”

Section: Introductionmentioning

confidence: 99%

“…Although the insecticide resistance status of O. furnacalis is not serious in the field [12], current control of this pest primarily relies on insecticides. Furthermore, following the rapid spread of the fall armyworm (Spodoptera frugiperda) to the continents of Asia, the Pacific and Australia [13], extensive application of insecticides for emergency control might increase selection pressure on O. furnacalis. Therefore, undesirable consequences of pesticide use such as the evolution of resistance in insect pests, environmental pollution, and threats to human health should be carefully considered.…”

Section: Introductionmentioning

confidence: 99%

Cadherin Protein Is Involved in the Action of Bacillus thuringiensis Cry1Ac Toxin in Ostrinia furnacalis

Jin

Zhai

Yang

et al. 2021

Toxins

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Transgenic crops expressing Bacillus thuringiensis (Bt) insecticidal proteins have been extensively planted for insect pest control, but the evolution of Bt resistance in target pests threatens the sustainability of this approach. Mutations of cadherin in the midgut brush border membrane was associated with Cry1Ac resistance in several lepidoptera species, including the Asian corn borer, Ostrinia furnacalis, a major pest of maize in Asian–Western Pacific countries. However, the causality of O. furnacalis cadherin (OfCad) with Cry1Ac resistance remains to be clarified. In this study, in vitro and in vivo approaches were employed to examine the involvement of OfCad in mediating Cry1Ac toxicity. Sf9 cells transfected with OfCad showed significant immunofluorescent binding with Cry1Ac toxin and exhibited a concentration-dependent mortality effect when exposed to Cry1Ac. The OfCad knockout strain OfCad-KO, bearing homozygous 15.4 kb deletion of the OfCad gene generated by CRISPR/Cas9 mutagenesis, exhibited moderate-level resistance to Cry1Ac (14-fold) and low-level resistance to Cry1Aa (4.6-fold), but no significant changes in susceptibility to Cry1Ab and Cry1Fa, compared with the original NJ-S strain. The Cry1Ac resistance phenotype was inherited as autosomal, recessive mode, and significantly linked with the OfCad knockout in the OfCad-KO strain. These results demonstrate that the OfCad protein is a functional receptor for Cry1Ac, and disruption of OfCad confers a moderate Cry1Ac resistance in O. furnacalis. This study provides new insights into the mode of action of the Cry1Ac toxin and useful information for designing resistance monitoring and management strategies for O. furnacalis.

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Regional and seasonal activity predictions for fall armyworm in Australia

Cited by 40 publications

References 60 publications

Insecticide resistance in Australian Spodoptera frugiperda (J.E. Smith) and development of testing procedures for resistance surveillance

Insecticide resistance in Australian Spodoptera frugiperda (J.E. Smith) and development of testing procedures for resistance surveillance

Behavioral and Physiological Plasticity Provides Insights into Molecular Based Adaptation Mechanism to Strain Shift in Spodoptera frugiperda

Cadherin Protein Is Involved in the Action of Bacillus thuringiensis Cry1Ac Toxin in Ostrinia furnacalis

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