Resistance of corn genotypes to fall armyworm Spodoptera frugiperda (Lepidoptera: Noctuidae)

Paiva, Ligia Alves de; Corrêa, Fernanda; Silva, Cinthia Luzia Teixeira; Moura, Tony de Lima; Silva, Franciele Cristina da; Araújo, Márcio da Silva; Jesus, Flávio Gonçalves de

doi:10.5897/ajb2016.15399

Cited by 9 publications

(10 citation statements)

References 16 publications

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“…In multivariate procedures, one of the most widely used techniques is hierarchical clustering [6,7,17,31]. By these methods, genotypes are grouped by a process that is repeated at several levels, establishing a dendrogram, with no predetermined optimal number of groups.…”

Section: Resultsmentioning

confidence: 99%

“…The other cultural treatments were applied as required for full crop development, without using any other chemical product, so as not to affect larva growth. The corn leaves used to feed the larvas were collected when the plants were in the eight-leaf (V8) stage, so that all genotypes were evaluated when the plants were in the same developmental stage [6,7,17]. to feed the larvas and the biological parameters were evaluated daily.…”

Section: Methodsmentioning

confidence: 99%

“…At the end of the process, the number of groups and accessions contained in each group are computed. This method was applied as suggested by [32] and is an important way of determining different groups based on different traits, together with the techniques of dissimilarity analysis and analysis of canonical variables [6]. The analysis of canonical variables explained 95.12% of the total variation between the five traits.…”

Section: Figurementioning

confidence: 99%

“…In view of the concern to reduce or even eliminate insecticide applications and only a few of studies involving S. frugiperda tolerance in popcorn, breeding programs ought to intensify studies to the selection of tolerant popcorn genotypes, as well as to elucidate key traits related to the identification of tolerance [6,7]. Although some traits related to identification of S. frugiperda tolerance, e.g., larval stage duration, final and mean larva weight, consumption rates and leaf area consumed have been studied in maize breeding programs [7], they have not yet been conclusively proven and used as key traits.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Selection of popcorn genotypes tolerant toSpodoptera frugiperdaand key traits related to the identification of tolerance

Kuroda

Rosa

Almeida

et al. 2021

Preprint

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The Spodoptera frugiperda, is one of the most deleterious pests of popcorn and the identification of tolerant genotypes is determinant in breeding programs. The objective of this study was to select popcorn genotypes tolerant to S. frugiperda and the key traits related to the identification of tolerance. The popcorn varieties UEM J1, Composto Márcia, Arachida, Composto Gaúcho and Zapalote Chico (resistant check) were evaluated in a completely randomized design with 100 replications. The experimental unit consisted of one Petri dish, containing plant material and a larva. The following traits were evaluated: larval stage duration (LSt), food intake weight (IW), final larva weight (FW), mean larva weight (MW), feces (F), assimilated (A) and metabolized food weight (M), relative consumption rate (RCR), relative metabolic rate (RMR), relative growth rate (RGR), conversion efficiency of ingested food (CEI), apparent digestibility (AD), conversion efficiency of digested food (CED) and leaf area consumed (LAC). The diagnosis of multicollinearity, analysis of canonical variables, genetic divergence, hierarchical clustering, factor analysis and canonical correspondence analysis were carried out to perform multivariate analysis. After the multicollinearity test, the traits FW, IW, RCR, AD and LAC were maintained for further analysis. Variety Arachida was considered tolerant to S. frugiperda and can be used in the future as a source of favorable alleles to breed tolerant popcorn hybrids. The traits relative consumption rate, apparent digestibility and leaf area consumed were considered key traits in the identification of tolerance against S. frugiperda in popcorn genotypes.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Selection of popcorn genotypes tolerant toSpodoptera frugiperdaand key traits related to the identification of tolerance

Kuroda

Rosa

Almeida

et al. 2021

Preprint

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Intercropped Bt and non‐Bt corn with ruzigrass (Urochloa ruziziensis) as a tool to resistance management of Spodoptera frugiperda (JE Smith, 1797) (Lepidoptera: Noctuidae)

Jacques

Degrande

Gauer

et al. 2021

Pest Management Science

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BACKGROUND: Corn intercropped with ruzigrass is common in Brazil, and it can improve the physicochemical features of soils, increase water retention, and suppress the emergence of resistant weeds and soil nematodes. As both corn and ruzigrass are hosts to Spodoptera frugiperda (the main corn pest in South America), the cultivation of both these plants in the same place at one time motivates investigation into the pest population dynamics. We hypothesize that the intercropping system influences S. frugiperda pressure and leaf injury in corn. Considering that if corn hybrids with high dose toxin expression are used, ruzigrass may be a potential host to susceptible S. frugiperda larvae, consequently an alternative refuge and be included as a tool for the resistant management of Bt corn. To test these hypotheses about the use of ruzigrass as an alternative host of S. frugiperda in an intercropping system with corn, we conducted field trials in three seasons to verify S. frugiperda population dynamics and leaf injury to crop systems. In addition to phenotypic evaluation, we also characterized molecularly S. frugiperda strains collected in corn and ruzigrass to identify strain differences.RESULTS: The insects collected in both corn and ruzigrass were identified as corn strains. Ruzigrass was used as a S. frugiperda host during all crop cycles. The intercropped system did not increase the S. frugiperda population or leaf injury on Bt corn. CONCLUSION:The results suggest that the intercropped system is not prejudicial to Bt corn cultivation since high dose concept applies to all larvae instars. The results also suggest that ruzigrass may be used as a promising alternative refuge in Bt corn agroecosystems, if compliance with management strategies is followed.

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Host Plant Resistance to Insect Pests in Maize

Soujanya,

Karjagi,

Suby

et al. 2024

Plant Resistance to Insects in Major Field Crops

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Resistance of corn genotypes to fall armyworm Spodoptera frugiperda (Lepidoptera: Noctuidae)

Cited by 9 publications

References 16 publications

Selection of popcorn genotypes tolerant toSpodoptera frugiperdaand key traits related to the identification of tolerance

Selection of popcorn genotypes tolerant toSpodoptera frugiperdaand key traits related to the identification of tolerance

Intercropped Bt and non‐Bt corn with ruzigrass (Urochloa ruziziensis) as a tool to resistance management of Spodoptera frugiperda (JE Smith, 1797) (Lepidoptera: Noctuidae)

Host Plant Resistance to Insect Pests in Maize

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