Does Bt maize cultivation affect the non-target insect community in the agro ecosystem?

Resende, Daniela Chaves; Mendes, S. M.; Marucci, Rosangela Cristina; Silva, Alessandra de Carvalho; Campanha, M. M.; Waquil, J. M.

doi:10.1016/j.rbe.2015.12.001

Cited by 28 publications

(20 citation statements)

References 22 publications

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“…There are two corn cropping seasons in Brazil, covering more than 16 million hectares in the 2017/2018 crop season . Prior to the introduction in 2008 of transgenic corn, expressing Bacillus thuringiensis (Bt) protein toxic to FAW larvae, FAW was kept below economic damage thresholds by frequent applications of insecticides . FAW control by synthetic contact insecticides has limitations as larvae tend to be protected from direct foliar insecticide treatments because they stay inside the corn whorl .…”

Section: Introductionmentioning

confidence: 99%

“…5 Prior to the introduction in 2008 of transgenic corn, expressing Bacillus thuringiensis (Bt) protein toxic to FAW larvae, FAW was kept below economic damage thresholds by frequent applications of insecticides. 6,7 FAW control by synthetic contact insecticides has limitations as larvae tend to be protected from direct foliar insecticide treatments because they stay inside the corn whorl. 8 The introduction of Bt corn in Brazil 10 years ago -covering > 80% of the total corn cropping area in 2016 -resulted in much less insecticide spraying against FAW.…”

Section: Introductionmentioning

confidence: 99%

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Detection of a ryanodine receptor target‐site mutation in diamide insecticide resistant fall armyworm, Spodoptera frugiperda

Boaventura

Bolzan

Padovez

et al. 2019

Pest Management Science

117

126

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BACKGROUND Fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith), a major lepidopteran pest in Latin and North America, has very recently invaded the continents of Africa and Asia. FAW has evolved resistance to different insecticides and transgenic corn expressing Bacillus thuringiensis (Bt) toxins. Here, we investigated the extent and mechanisms of resistance to diamide insecticides in a Brazilian field‐collected FAW strain selected using chlorantraniliprole. RESULTS Continuous laboratory selection of a field‐collected FAW strain with chlorantraniliprole resulted in resistance ratios of 225‐fold and > 5400‐fold against chlorantraniliprole and flubendiamide, respectively, when compared with a susceptible strain. Pre‐exposure to different synergists known to inhibit detoxification enzymes did not result in significantly increased larval toxicity, suggesting a minor role for metabolic resistance. Sequencing of the FAW ryanodine receptor (RyR) C‐terminal domains II to VI revealed a single nucleotide polymorphism, resulting in a I4734M mutation recently said to confer target‐site resistance to diamides in lepidopteran pests. Genotyping by pyrosequencing of field‐collected FAW larvae sampled in the 2018 crop season suggests a low resistance allele frequency. Furthermore, we developed a fluorescent polymerase chain reaction (PCR)‐based allelic discrimination assay for rapid genotyping of field‐collected FAW samples, because diamides are increasingly used in Bt−/non‐Bt corn. CONCLUSIONS Recently, the identified RyR mutation has been shown to confer field resistance in other lepidopteran pests such as diamondback moth, tomato leafminer and striped rice stem borer. The developed PCR‐based allelic discrimination assay will help to monitor the frequency and future spread of diamide resistance allele in FAW field populations and help to implement appropriate resistance management measures. © 2019 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Detection of a ryanodine receptor target‐site mutation in diamide insecticide resistant fall armyworm, Spodoptera frugiperda

Boaventura

Bolzan

Padovez

et al. 2019

Pest Management Science

117

126

View full text Add to dashboard Cite

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“…Currently, Bt maize is cultivated in more than 80% of maize‐growing areas in Brazil (∼12.5 million ha year ‐1 ) . The rapid adoption of Bt maize has contributed to a reduction in insecticidal sprays against FAW . However, the continuous expression of Bt proteins in maize plants imposes an intense selection pressure on target pest populations, favoring the evolution of resistance .…”

Section: Introductionmentioning

confidence: 99%

“…10 The rapid adoption of Bt maize has contributed to a reduction in insecticidal sprays against FAW. 11 However, the continuous expression of Bt proteins in maize plants imposes an intense selection pressure on target pest populations, favoring the evolution of resistance. 12 In Brazil, FAW in the field has evolved resistance to the Cry1F and Cry1Ab proteins expressed in maize.…”

Section: Introductionmentioning

confidence: 99%

Managing fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), with Bt maize and insecticides in southern Brazil

Burtet

Bernardi

Melo

et al. 2017

Pest Management Science

113

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“…Neem extract has insecticidal activity to a wide range of insects (George et al, 2014). Resende et al (2016) indicated that the richness and diversity of insects depend on location and insecticide spray. Various control practices used in modern agriculture are related to the decline of biodiversity in production areas.…”

Section: Discussionmentioning

confidence: 99%

Impact of Leaf Eating Caterpillar Controls on the Diversity of Insects in Asiatic Pennywort Farms

Name¹

2018

Appl. Ecol. Env. Res.

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Abstract. Annual loss of Asiatic pennywort production is primarily due to lepidopterous larvae. The pennywort cutworm (Zonoplusia ochreata) is one of the most destructive leaf feeders of pennywort. Most Thai growers prefer chemical controls to prevent production loss. Bioinsecticide is an alternative to synthetic insecticides. Some organic growers used Bacillus thuringiensis and neem extract for lepidopterous control in pennywort farms. We should understand how diversity of target and non-targeted species in the areas is impacted by different control management. Therefore, four preventative treatments were trialed: natural control in organic farming, Bacillus thuringiensis, neem extract and abamectin, to evaluate their effect on the biodiversity of insects in Chainat, Nonthaburi and Bangkok provinces, all located in the central region of Thailand. After 8 weekly spray applications, the insects were collected using the sweep sampling method. A total of 561 insects were identified belonging to 38 different species, including 34 predator species, and 29 parasitoid species. The effect of different treatments on the species diversity index and evenness index was calculated. Shannon's species diversity index (H') was higher in the natural control area (2.74) compared to areas treated with Bt (2.09), neem extract (1.90) and abamectin pesticide (1.88). The evenness index showed a similar trend; natural control (0.82), Bt (0.57), neem extract (0.62) and abamectin (0.55). The results support the hypotheses that organic farming promote insect diversity. Environmentally insect control approaches enhance biodiversity and ecological service in farmland.

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Does Bt maize cultivation affect the non-target insect community in the agro ecosystem?

Cited by 28 publications

References 22 publications

Detection of a ryanodine receptor target‐site mutation in diamide insecticide resistant fall armyworm, Spodoptera frugiperda

Detection of a ryanodine receptor target‐site mutation in diamide insecticide resistant fall armyworm, Spodoptera frugiperda

Managing fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), with Bt maize and insecticides in southern Brazil

Impact of Leaf Eating Caterpillar Controls on the Diversity of Insects in Asiatic Pennywort Farms

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