Susceptibility of Spodoptera frugiperda and Chrysodeixis includens (Lepidoptera: Noctuidae) to infections caused by Metarhizium rileyi

ABSTRACT Due to the reduced host spectrum of the entomopathogenic fungus Metarhizium rileyi, its pathogenicity against different target insects must be assessed to develop biopesticides capable of controlling more than one pest species. This study aimed to evaluate the susceptibility of the pest species Chrysodeixis includens and Spodoptera frugiperda to different isolates of M. rileyi and, thus, determine a possible influence of the host of origin on the pathogenic activity of these isolates. Three isolates [CG1312 (C. includens as original host), CG381 (S. frugiperda as original host) and a new wild isolate (C. includens as original host)] were tested against larvae of C. includens and S. frugiperda, in third instar age, by treatment of surfaces with conidial suspension, under laboratory conditions. Both species were susceptible to the isolates of M. rileyi, with mortality rates of 53-58 % for C. includens and 74-84 % for S. frugiperda. The results suggest that the host of origin may not be determinant in the selection of pathogenic isolates of M. rileyi against these two pest insects.

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Toxicidade residual de inseticidas utilizados para Spodoptera frugiperda (Lepidoptera: Noctuidae) em milho e Chrysodeixis includens (Lepidoptera: Noctuidae) em soja, e efeitos sobre o predador Doru luteipes (Dermaptera: Forficulidae)

10.11606/d.11.2018.tde-22032018-132601 ◽

2018 ◽

Author(s):

Kleber Batista da Silva

Keyword(s):

Spodoptera Frugiperda ◽

Lepidoptera Noctuidae ◽

Chrysodeixis Includens

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Field Efficacy of Metarhizium rileyi Applications Against Spodoptera frugiperda (Lepidoptera: Noctuidae) in Maize

Neotropical Entomology ◽

10.1007/s13744-021-00903-0 ◽

2021 ◽

Author(s):

Suellen Karina Albertoni Barros ◽

Euziclei Gonzaga de Almeida ◽

Fátima Teresinha Rampelotti Ferreira ◽

Marliton Rocha Barreto ◽

Rogério Biaggioni Lopes ◽

...

Keyword(s):

Spodoptera Frugiperda ◽

Metarhizium Rileyi ◽

Field Efficacy ◽

Lepidoptera Noctuidae

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POTENTIATION OF COPAÍBA OIL-RESIN WITH SYNTHETIC INSECTICIDES TO CONTROL OF FALL ARMYWORM

Revista Caatinga ◽

10.1590/1983-21252017v30n427rc ◽

2017 ◽

Vol 30 (4) ◽

pp. 1059-1066

Author(s):

WALDIANE ARAÚJO DE ALMEIDA ◽

IGOR HONORATO LEDUÍNO DA SILVA ◽

ANA CLÁUDIA VIEIRA DOS SANTOS ◽

AURÉLIO PAES BARROS JÚNIOR ◽

ADALBERTO HIPÓLITO DE SOUSA

Keyword(s):

Human Health ◽

Spodoptera Frugiperda ◽

Filter Paper ◽

Fall Armyworm ◽

Botanical Insecticides ◽

Response Curves ◽

Significant Toxicity ◽

Copaiba Oil ◽

Lepidoptera Noctuidae ◽

Selection Of

ABSTRACT The control of Spodoptera frugiperda (J. E. SMITH) (Lepidoptera: Noctuidae) has been carried out mainly with pyrethroids and organophosphates insecticides. The continuous and indiscriminate use of synthetic insecticides, for decades, has led to the selection of resistant populations and has caused concerns for human health and the environment. An alternative is the use of botanical insecticides, including through the mixtures with synthetic insecticides. This study aimed to investigate the toxicity of copaiba oil-resin mixtures (COR) with deltamethrin, beta-cyfluthrin, beta-cypermethrin, methomyl, triazophos and chlorpyrifos for S. frugiperda. Bioassays were performed in the laboratory using newly hatched caterpillars on a contaminated surface (filter paper). Initially, concentration-mortality curves were established for each insecticide and COR. Based on the results, experiments were conducted to verify the effect of the COR mixtures with synthetic insecticides in the proportions of 1:1 (LC25 + LC25) on larvae of S. frugiperda. Additionally, COR concentration-response curves were established by adding 1/8 of the recommended rate of each insecticide. Notably, the use of this concentration for all insecticides was previously determined in bioassays, and no significant toxicity was found for S. frugiperda caterpillars. It was found that the toxicity of COR increased substantially by adding synthetic insecticides, especially with lower mixtures with beta-cypermethrin, methomyl and triazophos.

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Selection of a Nucleopolyhedrovirus for Control of Spodoptera frugiperda (Lepidoptera: Noctuidae): Structural, Genetic, and Biological Comparison of Four Isolates from the Americas

Journal of Economic Entomology ◽

10.1093/jee/92.5.1079 ◽

1999 ◽

Vol 92 (5) ◽

pp. 1079-1085 ◽

Cited By ~ 62

Author(s):

Ana Escribano ◽

Trevor Williams ◽

David Goulson ◽

Ronald D. Cave ◽

Jason W. Chapman ◽

...

Keyword(s):

Spodoptera Frugiperda ◽

Lepidoptera Noctuidae ◽

Selection Of

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Is Pyemotes zhonghuajia (Acari: Pyemotidae) a suitable biological control agent against the fall armyworm Spodoptera frugiperda (Lepidoptera: Noctuidae)?

Systematic and Applied Acarology ◽

10.11158/saa.25.4.5 ◽

2020 ◽

Vol 25 (4) ◽

pp. 649-657

Author(s):

Jianfeng Liu ◽

Tai-An Tian ◽

Xue-Lin Li ◽

Yi-Chai Chen ◽

Xiao-Fei Yu ◽

...

Keyword(s):

Biological Control ◽

Spodoptera Frugiperda ◽

Biological Control Agent ◽

Fall Armyworm ◽

Mortality Rates ◽

Control Agent ◽

Attractive Alternative ◽

Basic Information ◽

Mite Density ◽

Lepidoptera Noctuidae

The fall armyworm (FAW), Spodoptera frugiperda Smith (Lepidoptera: Noctuidae), is one of the most damaging noctuid pests of maize and is reported in China at the beginning of 2019. It poses a serious threat to the food security of China. In order to find an attractive alternative to reduce the application of chemical insecticides, we screened different initial mite densities of Pyemotes zhonghuajia on the mortality rate of different stages of FAW and also recorded the number of P. zhonghuajia on FAW at the different times (24, 48, and 72 h). The results showed that initial mite densities had a significant effect on the mortality rates of all stages of FAW and the number of P. zhonghuajia found on the surface of FAW. One P. zhonghuajia female was able to significantly induce the mortality of FAW in the 1st to 3rd instar larvae, and the mite density of 40 could achieve 100% FAW mortality when added 1st to 5th instar larvae and prepupae. There was an increasing number of P. zhonghuajia on FAW from the 2nd to 4th instar larvae stages at all three days. These results provide the basic information for considering P. zhonghuajia as a suitable bio-control agent against FAW in China.

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Selección recurrente recíproca en maíz: tolerancia al ataque del gusano de la mazorca y el cogollero (Lepidoptera: Noctuidae).

Agronomía Mesoamericana ◽

10.15517/am.v9i1.24624 ◽

2016 ◽

Vol 9 (1) ◽

pp. 42

Author(s):

Mario Fuentes ◽

Alberto Pantoja ◽

Antonio Sotomayor ◽

James Beaver

Keyword(s):

Spodoptera Frugiperda ◽

Helicoverpa Zea ◽

Research Station ◽

Selection Cycle ◽

Agronomic Characteristics ◽

Maize Populations ◽

Natural Infestation ◽

Lepidoptera Noctuidae ◽

Initial Selection ◽

Selection Of

The progressive selection of yield, agronomic characteristics and quantification of damages caused by Spodoptera frugiperda (J.E. Smith) and Helicoverpa zea (Boddie), were evaluated after four selection cycles on maize populations (Zea mays L., varieties Ohio S9, Ohio S10, Mayorbela and Diente de caballo, under chemical control and natural infestation conditions. The experiments were carried out at an experimental site in a tropical agriculture research station (TARS), a USDA station located in Isabela, Puerto Rico. The experimental design consisted of random entire blocks with five repetitions, and treatments were asigned according to a factorial arrangement with parcels divided at a density of 44.444 plants/ha. Significant differences were found among populations and selection cycles for yield, plant and cob height, and percentage of insect-related losses*. The highest yield was obtained from the Ohio S 10 population with 4.824 kg/ha, and 169 kg/ha - a profit of 1.2% per selection cycle. The latest selection cycles showed a greater yield and better agronomic characteristics than the initial selection cycle of each population under improvement. Losses in yield caused by S. frugiperda and H. zea oscillated between 3-21 % and 17-28%, respectively. Ohio S9 showed the greatest los s in yield caused by these insects.

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Efficacy of Thai indigenous entomopathogenic nematodes for controlling fall armyworm (Spodoptera frugiperda) (J. E. Smith)(Lepidoptera; Noctuidae)

Egyptian Journal of Biological Pest Control ◽

10.1186/s41938-021-00497-0 ◽

2021 ◽

Vol 31 (1) ◽

Author(s):

Wandee Wattanachaiyingcharoen ◽

Ongpo Lepcha ◽

Apichat Vitta ◽

Det Wattanachaiyingcharoen

Keyword(s):

Mortality Rate ◽

Spodoptera Frugiperda ◽

Entomopathogenic Nematodes ◽

Biological Control Agent ◽

Fall Armyworm ◽

Mortality Rates ◽

Control Agent ◽

Larval Instars ◽

Sensitive Stage ◽

Lepidoptera Noctuidae

Abstract Background Under laboratory and greenhouse conditions, the virulence of 2 isolates of Thai indigenous entomopathogenic nematodes (EPNs) in controlling the fall armyworm (FAW), Spodoptera frugiperda (J. E. Smith) (Lepidoptera; Noctuidae), was demonstrated. Six EPNs dosages were tested against 2 larval instars of FAW under the laboratory conditions, while 2 different concentrations were tested under the greenhouse conditions. Results The results of a laboratory experiment revealed that 2 Thai indigenous EPNs isolates (Heterorhabditis indica isolate AUT 13.2 and Steinernema siamkayai isolate APL 12.3) were efficient against the FAW, 2nd and 5th larval instars. Six different nematode concentrations (50,100, 150, 200, 250 and 300 infectious juveniles (IJs) ml−1) were evaluated, and all were proven to be effective, with the mortality rate associated with concentration. Inoculated larvae in the 2nd instar was more vulnerable than that in the 5th instar. H. indica isolate AUT 13.2 was more destructive than S. siamkayai isolate APL 12.3. The greatest mortality rate of 2nd instar larvae was 83% when H. indica AUT 13.2 was applied at the concentration of 250 IJs ml−1, and 68% when the nematode S. siamkayai APL 12.3 was used at the concentration of 300 IJs ml−1. At 250 IJsml−1, the highest mortality rate of the 5th instar larvae was 45% for H. indica AUT 13.2 and 33% for S. siamkayai APL 12.3, respectively. To customize the concentration and volume of nematodes suspension evaluated in the greenhouse settings, the most sensitive stage of FAW and the optimum concentration that caused the highest mortality were used. The concentrations of both indigenous nematodes’ isolates were 20,000 and 50,000 IJsml−1 per pot, respectively, and the results showed that the mortality rates were lower than that in the laboratory. FAW mortality rate was the highest (58%) in case of the nematode H. indica isolate AUT 13.2, against (45%) in case of S. siamkayai isolate APL 12.3, at the 50,000 IJs ml−1 concentrations. Conclusions The study revealed the 2 Thai indigenous EPNs isolates (H. indica isolate AUT 13.2 and S. siamkayai isolate APL 12.3) were capable of controlling the FAW in both laboratory and greenhouse environments. The 2 Thai EPNs showed the potential to be considered as a biological control agent.

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