Field‐evolved resistance to chlorpyrifos by Spodoptera frugiperda (Lepidoptera: Noctuidae): inheritance mode, cross‐resistance patterns, and synergism

2021 ◽  
Author(s):  
Cínthia G Garlet ◽  
Patricia da S Gubiani ◽  
Ramon B Palharini ◽  
Rafaella P Moreira ◽  
Daniela N Godoy ◽  
...  
Keyword(s):  
Spodoptera Frugiperda ◽  
Cross Resistance ◽  
Resistance Patterns ◽  
Inheritance Mode ◽  
Lepidoptera Noctuidae

Baseline Response, Monitoring, and Cross-Resistance of Spodoptera frugiperda (Lepidoptera: Noctuidae) to Sodium Channel Blocker Insecticides in Brazil

2021 ◽  
Author(s):  
Ingrid S Kaiser ◽  
Rubens H Kanno ◽  
Anderson Bolzan ◽  
Fernando S A Amaral ◽  
Ewerton C Lira ◽  
...  
Keyword(s):  
Sodium Channel ◽  
Spodoptera Frugiperda ◽  
Channel Blocker ◽  
Resistance Management ◽  
Response Monitoring ◽  
Cross Resistance ◽  
Channel Blockers ◽  
Sodium Channel Blocker ◽  
Baseline Response ◽  
Lepidoptera Noctuidae

Abstract Spodoptera frugiperda (J.E. Smith) is one of the key cross-crop pests in Brazilian agroecosystems. Field-evolved resistance of S. frugiperda to some conventional insecticides and Bt proteins has already been reported. Thus, the use of insecticides with new mode of action such as sodium channel blockers (indoxacarb and metaflumizone) could be an important tool in insecticide resistance management (IRM) programs. To implement a proactive IRM, we conducted baseline response and monitoring to indoxacarb and metaflumizone in 87 field populations of S. frugiperda collected from major maize-growing regions of Brazil from 2017 to 2020, estimated the frequency of resistance alleles to indoxacarb, and evaluated cross-resistance of indoxacarb and metaflumizone to some selected insecticides and Bt proteins. Low variation in susceptibility to indoxacarb (4.6-fold) and metaflumizone (2.6-fold) was detected in populations of S. frugiperda in 2017. The frequency of the resistance allele to indoxacarb was 0.0452 (0.0382–0.0527 CI 95%), by using F2 screen method. The mean survival at diagnostic concentration, based on CL99, varied from 0.2 to 12.2% for indoxacarb and from 0.0 to 12.7% for metaflumizone, confirming high susceptibility of S. frugiperda to these insecticides in Brazil. No cross-resistance was detected between sodium channel blocker insecticides and other insecticides (organophosphate, pyrethroid, benzoylurea, spinosyn, and diamide) and Bt proteins. These findings showed that sodium channel blocker insecticides are important candidates to be exploited in IRM strategies of S. frugiperda in Brazil.

Resistance of Spodoptera frugiperda (Lepidoptera: Noctuidae) to spinetoram: inheritance and cross‐resistance to spinosad

2020 ◽  
Vol 76 (8) ◽  
pp. 2674-2680 ◽  
Author(s):  
Ewerton C Lira ◽  
Anderson Bolzan ◽  
Antonio RB Nascimento ◽  
Fernando SA Amaral ◽  
Rubens H Kanno ◽  
...  
Keyword(s):  
Spodoptera Frugiperda ◽  
Cross Resistance ◽  
Lepidoptera Noctuidae

Inheritance patterns, cross‐resistance and synergism in Spodoptera frugiperda (Lepidoptera: Noctuidae) resistant to emamectin benzoate

2021 ◽  
Author(s):  
Dionei Schmidt Muraro ◽  
Dyrson Oliveira Abbade Neto ◽  
Rubens Hideo Kanno ◽  
Ingrid Schimidt Kaiser ◽  
Oderlei Bernardi ◽  
...  
Keyword(s):  
Spodoptera Frugiperda ◽  
Cross Resistance ◽  
Emamectin Benzoate ◽  
Inheritance Patterns ◽  
Lepidoptera Noctuidae

Inheritance of Cry1F resistance, cross-resistance and frequency of resistant alleles inSpodoptera frugiperda(Lepidoptera: Noctuidae)

2013 ◽  
Vol 103 (6) ◽  
pp. 700-713 ◽  
Author(s):  
A.M. Vélez ◽  
T.A. Spencer ◽  
A.P. Alves ◽  
D. Moellenbeck ◽  
R.L. Meagher ◽  
...  
Keyword(s):  
Puerto Rico ◽  
Bacillus Thuringiensis ◽  
Spodoptera Frugiperda ◽  
Resistant Strain ◽  
Parental Strain ◽  
Single Locus ◽  
Cross Resistance ◽  
Screening Assay ◽  
Low Levels ◽  
Lepidoptera Noctuidae

AbstractTransgenic maize,Zea maizeL., expressing the Cry1F protein fromBacillus thuringiensishas been registered forSpodoptera frugiperda(J. E. Smith) control since 2003. Unexpected damage to Cry1F maize was reported in 2006 in Puerto Rico and Cry1F resistance inS. frugiperdawas documented. The inheritance of Cry1F resistance was characterized in aS. frugiperdaresistant strain originating from Puerto Rico, which displayed >289-fold resistance to purified Cry1F. Concentration–response bioassays of reciprocal crosses of resistant and susceptible parental populations indicated that resistance is recessive and autosomal. Bioassays of the backcross of the F1generation crossed with the resistant parental strain suggest that a single locus is responsible for resistance. In addition, cross-resistance to Cry1Aa, Cry1Ab, Cry1Ac, Cry1Ba, Cry2Aa and Vip3Aa was assessed in the Cry1F-resistant strain. There was no significant cross-resistance to Cry1Aa, Cry1Ba and Cry2Aa, although only limited effects were observed in the susceptible strain. Vip3Aa was highly effective against susceptible and resistant insects indicating no cross-resistance with Cry1F. In contrast, low levels of cross-resistance were observed for both Cry1Ab and Cry1Ac. Because the resistance is recessive and conferred by a single locus, an F1screening assay was used to measure the frequency of Cry1F-resistant alleles from populations of Florida and Texas in 2010 and 2011. A total frequency of resistant alleles of 0.13 and 0.02 was found for Florida and Texas populations, respectively, indicating resistant alleles could be found in US populations, although there have been no reports of reduced efficacy of Cry1F-expressing plants.

scholarly journals Exigências térmicas e estimativa do número de gerações dos biótipos "milho" e "arroz" de Spodoptera frugiperda

2005 ◽  
Vol 40 (4) ◽  
pp. 329-335 ◽  
Author(s):  
Gustavo Rossato Busato ◽  
Anderson Dionei Grützmacher ◽  
Mauro Silveira Garcia ◽  
Fabrizio Pinheiro Giolo ◽  
Moisés João Zotti ◽  
...  
Keyword(s):  
Spodoptera Frugiperda ◽  
Rio Grande ◽  
Rio Grande Do Sul ◽  
Lepidoptera Noctuidae

O objetivo deste trabalho foi avaliar o efeito da temperatura sobre a biologia dos biótipos "milho" e "arroz" de Spodoptera frugiperda (J.E. Smith, 1797) (Lepidoptera: Noctuidae) e estimar o número de gerações por ano em laboratório e campo. Foram coletadas lagartas de quatro populações de S. frugiperda no Estado do Rio Grande do Sul, identificadas eletroforeticamente como os biótipos "milho" e "arroz", em áreas isoladas, distanciadas entre si em mais de 300 km, produtoras de milho e arroz irrigado e em áreas adjacentes, que produzem milho e arroz irrigado lado a lado. A temperatura mais adequada para o desenvolvimento dos dois biótipos foi 25ºC. Em laboratório, podem ser obtidas 11,0 e 11,3 gerações ano-1 do biótipo "milho" proveniente de áreas isoladas e adjacentes, respectivamente. Foram estimadas 12,1 gerações ano-1 do biótipo "arroz" quando proveniente de áreas isoladas e 12,2 gerações ano-1 quando proveniente de áreas adjacentes. Em campo, estimou-se a ocorrência de 8,3 e 6,1 gerações ano-1 do biótipo "milho", respectivamente, em áreas isoladas e áreas adjacentes e 8,4 e 7,0 gerações ano-1 do biótipo "arroz", respectivamente, em áreas isoladas e áreas adjacentes. Em áreas adjacentes, o biótipo "arroz" apresenta uma geração a mais ao longo de um ano em relação ao biótipo "milho".

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