scholarly journals Demonstration Using Field Collections that Argentina Fall Armyworm Populations Exhibit Strain-specific Host Plant Preferences

2015 ◽  
Vol 108 (5) ◽  
pp. 2305-2315 ◽  
Author(s):  
M. Gabriela Murúa ◽  
Rodney N. Nagoshi ◽  
Daniel A. dos Santos ◽  
Mirian M. Hay-Roe ◽  
Robert L. Meagher ◽  
...  
Keyword(s):  
Host Plant ◽  
Fall Armyworm ◽  
Specific Host

scholarly journals The race goes on: A fall armyworm-resistant maize inbred line influences insect oral secretion elicitation activity and nullifies herbivore suppression of plant defense

2021 ◽  
Author(s):  
Saif ul Malook ◽  
Xiao-Feng Liu ◽  
Wende Liu ◽  
Jinfeng Qi ◽  
Shaoqun Zhou
Keyword(s):  
Plant Defense ◽  
Host Plant ◽  
Inbred Line ◽  
Defense Mechanisms ◽  
Molecular Mechanisms ◽  
Fall Armyworm ◽  
Defense Responses ◽  
Feeding Preference ◽  
Maize Inbred Line ◽  
Oral Secretion

Fall armyworm (Spodoptera frugiperda) is an invasive lepidopteran pest with strong feeding preference towards maize (Zea mays). Its success on maize is facilitated by a suite of specialized detoxification and manipulation mechanisms that curtail host plant defense responses. In this study, we identified a Chinese maize inbred line Xi502 that was able to mount effective defense in response to fall armyworm attack. Comparative transcriptomics analyses, phytohormonal measurements, and targeted benzoxazinoid quantification consistently demonstrate significant inducible defense responses in Xi502, but not in the susceptible reference inbred line B73. In 24 hours, fall armyworm larvae feeding on B73 showed accelerated maturation-oriented transcriptomic responses and more changes in detoxification gene expression compared to their Xi502-fed sibling. Interestingly, oral secretions collected from larvae fed on B73 and Xi502 leaves demonstrated distinct elicitation activity when applied on either host genotypes, suggesting that variation in both insect oral secretion composition and host plant alleles could influence plant defense response. These results revealed host plant adaptation towards counter-defense mechanisms in a specialist insect herbivore, adding yet another layer to the evolutionary arms race between maize and fall armyworm. This could facilitate future investigation into the molecular mechanisms in this globally important crop-pest interaction system.

scholarly journals Adaptation by copy number variation increases insecticide resistance in fall armyworms

2019 ◽  
Author(s):  
Kiwoong Nam ◽  
Sylvie Gimenez ◽  
Frederique Hilliou ◽  
Carlos A. Blanco ◽  
Sabine Hänniger ◽  
...  
Keyword(s):  
Copy Number Variation ◽  
Insecticide Resistance ◽  
Host Plant ◽  
Copy Number ◽  
Host Plants ◽  
Fall Armyworm ◽  
Copy Number Variations ◽  
Main Challenge ◽  
Number Variation ◽  
Allelic Differentiation

AbstractInsecticide resistance is a major main challenge in pest control, and understanding its genetic basis is a key topic in agricultural ecology. Detoxification genes are well-known genetic elements that play a key role in adaptation to xenobiotics. The adaptive evolution of detoxification genes by copy number variations has been interpreted as a cause of insecticide resistance. However, the same pattern can be generated by the adaptation to host-plant defense toxins as well. In this study, we tested in fall armyworms (Lepidoptera Spodoptera frugiperda) if adaptation by copy number variation is the cause of the increased level of insecticide resistance from two geographic populations with different levels of resistance and two strains with different host plants. Following the generation of an assembly with chromosome-sized scaffolds (N50 = 13.2Mb), we observed that these two populations show a significant allelic differentiation of copy number variations, which is not observed between strains. In particular, a locus with almost complete allelic differentiation (Fst > 0.8) includes a cluster of P450 genes, which are well-known key players in detoxification. Detoxification genes are overrepresented in the genes with copy number variations, and the observed copy number variation appears to have beneficial effects in general. From this result, we concluded that copy number variation of detoxification genes in fall armyworms plays a key role in the insecticide resistance but not in the adaptation to host-plants, suggesting that the evolution of insecticide resistance may occur independently from host-plant adaptation.

scholarly journals Preferable Host Plants of Fall Armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae) Larvae in Southern Punjab Pakistan under Laboratory Conditions

2021 ◽  
Vol 9 (3) ◽  
pp. 156-160
Author(s):  
Muhammad Ramzan ◽  
Keyword(s):  
Host Plant ◽  
Spodoptera Frugiperda ◽  
Host Plants ◽  
Fall Armyworm ◽  
Developmental Period ◽  
Invasive Pest ◽  
Larval Feeding ◽  
Agricultural Crops ◽  
The World ◽  
Lepidoptera Noctuidae

Fall armyworm, Spodoptera frugiperda is considered an important noctuid moth pest of agricultural crops all over the world and recently become an invasive pest in Pakistan. The crops belonging to Asteraceae, Fabaceae and Poaceae families are highly affected with this pest. The description of host plants is very important in understanding the biology, ecology and application of most effective techniques against the pest. By keeping in view, the importance of this pest, the current study was conducted to evaluate the most preferable host plant such as maize, potato, cabbage, cotton and lehli for this pest in the study area. The results showed that cabbage and maize were the most suitable hosts for larval feeding. The incubation period was recorded 2.00 and 2.12 days on cabbage and maize, respectively. The developmental period of larvae was found longer on cabbage as compared to maize. Potato, cotton and lehli were not found suitable for pest rearing. The study concluded that maize and cabbage are the most suitable hosts for S. frugiperda larvae under natural and controlled conditions.

Influence of Host Plant on the Susceptibility of the Fall Armyworm to Insecticides1

1981 ◽  
Vol 74 (1) ◽  
pp. 96-98 ◽  
Author(s):  
Kathleen A. Wood ◽  
Bob H. Wilson ◽  
Jerry B. Graves
Keyword(s):  
Host Plant ◽  
Fall Armyworm

scholarly journals THE INFECTIVITY OF SFMNPV ON FALL ARMYWORM IS INFLUENCED BY THE HOST PLANT

2018 ◽  
Vol 17 (3) ◽  
pp. 369
Author(s):  
IGOR HENRIQUE SENA DA SILVA ◽  
VICTOR HUGO DUARTE DA COSTA ◽  
JULIANO DE CARVALHO CURY ◽  
FERNANDO HERCOS VALICENTE ◽  
RICARDO ANTONIO POLANCZYK
Keyword(s):  
Host Plant ◽  
Plant Species ◽  
Spodoptera Frugiperda ◽  
Host Plants ◽  
Larval Mortality ◽  
Virus Production ◽  
Fall Armyworm ◽  
Pupal Weight ◽  
Virus Concentration ◽  
Plant Host

ABSTRACT - This work evaluated the infectivity and production of occlusion bodies (OBs) of the SfMNPV-6NR on fall armyworm (FAW), Spodoptera frugiperda, when fed on different host plants. The experiment was performed in laboratory, in a completely randomized design using two concentrations of SfMNPV-6NR (2×106 and 2×107 OBs/mL) and six different host plants (soybean, corn, cotton, bean, sorghum and millet). The larval mortality, larval weight (LW), pupal weight (PW) of S. frugiperda and the production of OBs by virus were evaluated. S. frugiperda larvae were less susceptible to baculovirus when fed on cotton leaves (38 ± 4.17 and 70 ± 6.44% mortality) in the two concentrations tested (2×106 and 2×107 OBs/mL, respectively). The LW was affected by the virus concentration depending on the plant species consumed and the virus concentrations. The PW was affected by the plant species used to feed larvae. There was no effect of the host plant on the OBs virus production. The results demonstrate adverse effects of the host plant on the infectivity of the SfMNPV-6NR in S. frugiperda, especially a deleterious effect of the cotton plant in the virus infection capacity.Keywords: Fall armyworm, entomopathogenic virus, tritrophic interaction, plant host, cotton. A INFECTIVIDADE DE SfMNPV SOBRE A LAGARTA-DO-CARTUCHO É INFLUENCIADA PELA PLANTA HOSPEDEIRA  RESUMO – Este trabalho avaliou a capacidade de infecção e produção de corpos de oclusão (CO) de SfMNPV- 6NR sobre a lagarta-do-cartucho, Spodoptera frugiperda, quando alimentada em diferentes plantas hospedeiras. O experimento foi realizado em laboratório, em delineamento inteiramente casualizado, utilizando duas concentrações de SfMNPV-6NR (2×106 e 2×107 CO/mL) e seis diferentes plantas hospedeiras (soja, milho, algodão, feijão, sorgo e milheto). Foram avaliados a mortalidade larval, o peso de larvas mortas (PL), o peso de pupa (PP) e a produção de CO do vírus. As larvas de S. frugiperda foram menos suscetíveis ao baculovírus quando alimentadas com folhas de algodão, apresentando as menores taxas de mortalidade (38 ± 4,17 e 70 ± 6,44%) com as duas concentrações testadas (2×106 e 2×107 CO/mL, respectivamente). O PL foi afetado pela concentração de vírus, dependendo da espécie de planta consumida e concentração de vírus testada. O PP foi afetado pela espécie de planta com a qual as larvas foram alimentadas. Não houve efeito da planta hospedeira na produção de CO do vírus. Nossos resultados demonstram um efeito adverso da planta hospedeira sobre a infectividade do vírus em S. frugiperda, especialmente um efeito deletério da planta de algodão na capacidade de infecção do vírus.Palavras-chave: lagarta-do-cartucho-do-milho, vírus entomopatogênico, interação tritrófica, planta hospedeira, algodão. 

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