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Svobodová Z, Skoková Habuštová O, Sehadová H. No bioaccumulation of Cry protein in the aphidophagous predator Harmonia axyridis. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2023; 97:104015. [PMID: 36400325 DOI: 10.1016/j.etap.2022.104015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 11/09/2022] [Accepted: 11/12/2022] [Indexed: 06/16/2023]
Abstract
The uptake of insecticidal Cry1Ab from genetically engineered (GE) maize, via herbivore Rhopalosiphum padi, to a predator Harmonia axyridis and its potential intergenerational transfer were investigated. Cry1Ab concentration was found to be 400-fold lower in R. padi compared to GE maize, and more than two-fold lower in H. axyridis. For 62% of H. axyridis samples, Cry1Ab was under the limit of detection (LOD), for another 13% were under the limit of quantification (LOQ). The concentration of Cry1Ab was similar between H. axyridis exposed short-term and long-term with the exception of adults after long-term. There was no correlation between Cry1Ab in females and eggs and neonates. The performance of H. axyridis was comparable between Cry1Ab and control. Histological investigation did not show any pathological changes in the digestive and reproductive systems. The detected route of exposure is unlikely to be important for functional biological control by H. axyridis in agroecosystem.
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Affiliation(s)
- Zdeňka Svobodová
- Czech Academy of Sciences, Biology Centre, Institute of Entomology, České Budějovice 370 05, Czech Republic.
| | - Oxana Skoková Habuštová
- Czech Academy of Sciences, Biology Centre, Institute of Entomology, České Budějovice 370 05, Czech Republic
| | - Hana Sehadová
- Czech Academy of Sciences, Biology Centre, Institute of Entomology, České Budějovice 370 05, Czech Republic; Faculty of Science, University of South Bohemia, České Budějovice 370 05, Czech Republic
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Then C, Miyazaki J, Bauer-Panskus A. Deficiencies in the Risk Assessment of Genetically Engineered Bt Cowpea Approved for Cultivation in Nigeria: A Critical Review. PLANTS 2022; 11:plants11030380. [PMID: 35161361 PMCID: PMC8838765 DOI: 10.3390/plants11030380] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 01/22/2022] [Accepted: 01/25/2022] [Indexed: 12/23/2022]
Abstract
We analyze the application filed for the marketing and cultivation of genetically engineered Bt cowpea (event AAT 709A) approved in Nigeria in 2019. Cowpea (Vigna ungiguiculata) is extensively grown throughout sub-Saharan Africa and consumed by around two hundred million people. The transgenic plants produce an insecticidal, recombinant Bt toxin meant to protect the plants against the larvae of Maruca vitrata, which feed on the plants and are also known as pod borer. Our analysis of the application reveals issues of concern regarding the safety of the Bt toxins produced in the plants. These concerns include stability of gene expression, impact on soil organisms, effects on non-target species and food safety. In addition, we show deficiencies in the risk assessment of potential gene flow and uncontrolled spread of the transgenes and cultivated varieties as well as the maintenance of seed collections. As far as information is publicly available, we analyze the application by referring to established standards of GMO risk assessment. We take the provisions of the Cartagena Protocol on Biosafety (CPB) into account, of which both Nigeria and the EU are parties. We also refer to the EU standards for GMO risk assessment, which are complementary to the provisions of the CPB.
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Belousova ME, Malovichko YV, Shikov AE, Nizhnikov AA, Antonets KS. Dissecting the Environmental Consequences of Bacillus thuringiensis Application for Natural Ecosystems. Toxins (Basel) 2021; 13:toxins13050355. [PMID: 34065665 PMCID: PMC8155924 DOI: 10.3390/toxins13050355] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 05/10/2021] [Accepted: 05/13/2021] [Indexed: 12/30/2022] Open
Abstract
Bacillus thuringiensis (Bt), a natural pathogen of different invertebrates, primarily insects, is widely used as a biological control agent. While Bt-based preparations are claimed to be safe for non-target organisms due to the immense host specificity of the bacterium, the growing evidence witnesses the distant consequences of their application for natural communities. For instance, upon introduction to soil habitats, Bt strains can affect indigenous microorganisms, such as bacteria and fungi, and further establish complex relationships with local plants, ranging from a mostly beneficial demeanor, to pathogenesis-like plant colonization. By exerting a direct effect on target insects, Bt can indirectly affect other organisms in the food chain. Furthermore, they can also exert an off-target activity on various soil and terrestrial invertebrates, and the frequent acquisition of virulence factors unrelated to major insecticidal toxins can extend the Bt host range to vertebrates, including humans. Even in the absence of direct detrimental effects, the exposure to Bt treatment may affect non-target organisms by reducing prey base and its nutritional value, resulting in delayed alleviation of their viability. The immense phenotypic plasticity of Bt strains, coupled with the complexity of ecological relationships they can engage in, indicates that further assessment of future Bt-based pesticides' safety should consider multiple levels of ecosystem organization and extend to a wide variety of their inhabitants.
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Affiliation(s)
- Maria E. Belousova
- Laboratory for Proteomics of Supra-Organismal Systems, All-Russia Research Institute for Agricultural Microbiology (ARRIAM), 196608 St. Petersburg, Russia; (M.E.B.); (Y.V.M.); (A.E.S.); (A.A.N.)
| | - Yury V. Malovichko
- Laboratory for Proteomics of Supra-Organismal Systems, All-Russia Research Institute for Agricultural Microbiology (ARRIAM), 196608 St. Petersburg, Russia; (M.E.B.); (Y.V.M.); (A.E.S.); (A.A.N.)
- Faculty of Biology, St. Petersburg State University, 199034 St. Petersburg, Russia
| | - Anton E. Shikov
- Laboratory for Proteomics of Supra-Organismal Systems, All-Russia Research Institute for Agricultural Microbiology (ARRIAM), 196608 St. Petersburg, Russia; (M.E.B.); (Y.V.M.); (A.E.S.); (A.A.N.)
- Faculty of Biology, St. Petersburg State University, 199034 St. Petersburg, Russia
| | - Anton A. Nizhnikov
- Laboratory for Proteomics of Supra-Organismal Systems, All-Russia Research Institute for Agricultural Microbiology (ARRIAM), 196608 St. Petersburg, Russia; (M.E.B.); (Y.V.M.); (A.E.S.); (A.A.N.)
- Faculty of Biology, St. Petersburg State University, 199034 St. Petersburg, Russia
| | - Kirill S. Antonets
- Laboratory for Proteomics of Supra-Organismal Systems, All-Russia Research Institute for Agricultural Microbiology (ARRIAM), 196608 St. Petersburg, Russia; (M.E.B.); (Y.V.M.); (A.E.S.); (A.A.N.)
- Faculty of Biology, St. Petersburg State University, 199034 St. Petersburg, Russia
- Correspondence:
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Meissle M, Kloos S, Romeis J. Fate of multiple Bt proteins from stacked Bt maize in the predatory lady beetle Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae). ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 268:115421. [PMID: 33157396 DOI: 10.1016/j.envpol.2020.115421] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 07/16/2020] [Accepted: 08/10/2020] [Indexed: 06/11/2023]
Abstract
Insecticidal Cry proteins from Bacillus thuringiensis (Bt) can be transferred from genetically engineered crops to herbivores to natural enemies. For the lady beetle Harmonia axyridis, we investigated potential uptake of Cry proteins from the gut to the body and intergenerational transfer. Third and fourth instar H. axyridis fed with pollen or spider mites from SmartStax maize contained substantial amounts of Cry1A.105, Cry1F, Cry2Ab2, Cry3Bb1, and Cry34Ab1. Cry protein concentrations in lady beetle larvae were typically one order of magnitude lower than in the food. When H. axyridis larvae were fed Bt maize pollen, median amounts of Cry protein in the non-feeding pupae were below the limit of detection except for small amounts of Cry34Ab1. No Cry protein was detected in pupae when spider mites were used as food. Cry protein concentrations decreased quickly after H. axyridis larvae were transferred from pollen or spider mites to Bt-free food. Aphids contained very low or no detectable Cry protein, and no Cry protein was found in H. axyridis larvae fed with aphids, and in pupae. When H. axyridis adults were fed with Bt maize pollen (mixed with Ephestia kuehniella eggs), the median concentrations of Cry proteins in lady beetle eggs were below the limit of detection except for Cry34Ab1 in eggs laid later in adult life. No Bt protein was detected in eggs laid by H. axyridis females fed with aphids from Bt maize. Our results confirm previous observations that Cry proteins are degraded and excreted quickly in the arthropod food web without evidence for bioaccumulation. Despite the fact that small amounts of Cry proteins were detected in some samples of the non-feeding pupal stage of H. axyridis as well as in eggs, we conclude that this route of exposure is unlikely to be significant for predators or parasitoids in a Bt maize field.
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Affiliation(s)
- Michael Meissle
- Research Division Agroecology and Environment, Agroscope, Reckenholzstrasse 191, 8046, Zürich, Switzerland.
| | - Stefanie Kloos
- Research Division Agroecology and Environment, Agroscope, Reckenholzstrasse 191, 8046, Zürich, Switzerland
| | - Jörg Romeis
- Research Division Agroecology and Environment, Agroscope, Reckenholzstrasse 191, 8046, Zürich, Switzerland
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Wang Y, Li D, Zhou H, Liu H, Niu L, Wang L, Ma W. Evaluation of Cry1Ac and Cry2Aa Toxin Binding to Two Important Beneficial Cotton Field Insects, Harmonia axyridis and Orius similis. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:8698-8702. [PMID: 30059215 DOI: 10.1021/acs.jafc.8b02634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Transgenic crops expressing Cry toxins are effective and considered environmentally friendly alternatives to synthetic pesticides, but assessment of environmental risks of their application on nontarget organisms is ongoing. The main risk is the transfer of Cry toxins to natural enemies through the food chain. There is reported evidence supporting that Cry toxins can be detected in the body and gut of some natural enemy insects. Considering that binding of Cry toxins to insect proteins is an essential step in the intoxication process, this work was conducted to evaluate interactions between Cry1Ac and Cry2Aa toxins with proteins from larvae/nymphs and adults of two important predatory natural enemies in cotton fields, Harmonia axyridis and Orius similis. Results support the absence of Cry1Ac or Cry2Aa binding proteins in immature stages of H. axyridis and O. similis, as well as in imaginal stage of H. axyridis. One same binding band about 70 kDa was found in imaginal total protein of O. similis when probed with the two Cry proteins, with the best match to Hsc70 of O. sauteri in the Uniprot database. However, nonspecific binding was verified by following competitive binding assays between the two Cry proteins and imaginal total protein of O. similis. From these results, we may infer that Cry1Ac and Cry2Aa have no likely detrimental effects on H. axyridis and O. similis.
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Affiliation(s)
- Yong Wang
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory , Huazhong Agricultural University , Wuhan 430070 , China
- Hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables , Hubei Engineering University , Xiaogan 432000 , China
| | - Dabo Li
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory , Huazhong Agricultural University , Wuhan 430070 , China
- Yichang Institute of Termite Control , Yichang 443000 , China
| | - Hao Zhou
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory , Huazhong Agricultural University , Wuhan 430070 , China
| | - Hui Liu
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory , Huazhong Agricultural University , Wuhan 430070 , China
| | - Lin Niu
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory , Huazhong Agricultural University , Wuhan 430070 , China
| | - Lihua Wang
- Hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables , Hubei Engineering University , Xiaogan 432000 , China
| | - Weihua Ma
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory , Huazhong Agricultural University , Wuhan 430070 , China
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Svobodová Z, Shu Y, Skoková Habuštová O, Romeis J, Meissle M. Stacked Bt maize and arthropod predators: exposure to insecticidal Cry proteins and potential hazards. Proc Biol Sci 2018; 284:rspb.2017.0440. [PMID: 28724730 DOI: 10.1098/rspb.2017.0440] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Accepted: 06/12/2017] [Indexed: 01/24/2023] Open
Abstract
Genetically engineered (GE) crops with stacked insecticidal traits expose arthropods to multiple Cry proteins from Bacillus thuringiensis (Bt). One concern is that the different Cry proteins may interact and lead to unexpected adverse effects on non-target species. Bi- and tri-trophic experiments with SmartStax maize, herbivorous spider mites (Tetranychus urticae), aphids (Rhopalosiphum padi), predatory spiders (Phylloneta impressa), ladybeetles (Harmonia axyridis) and lacewings (Chrysoperla carnea) were conducted. Cry1A.105, Cry1F, Cry3Bb1 and Cry34Ab1 moved in a similar pattern through the arthropod food chain. By contrast, Cry2Ab2 had highest concentrations in maize leaves, but lowest in pollen, and lowest acquisition rates by herbivores and predators. While spider mites contained Cry protein concentrations exceeding the values in leaves (except Cry2Ab2), aphids contained only traces of some Cry protein. Predators contained lower concentrations than their food. Among the different predators, ladybeetle larvae showed higher concentrations than lacewing larvae and juvenile spiders. Acute effects of SmartStax maize on predator survival, development and weight were not observed. The study thus provides evidence that the different Cry proteins do not interact in a way that poses a risk to the investigated non-target species under controlled laboratory conditions.
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Affiliation(s)
- Zdeňka Svobodová
- Agroscope, Research Division Agroecology and Environment, Reckenholzstrasse 191, Zurich 8046, Switzerland.,Institute of Ecology and Evolution, University of Bern, Baltzerstrasse 6, Bern 3012, Switzerland.,Institute of Entomology, Biology Centre CAS, Branišovská 31, České Budějovice 37005, Czech Republic.,Faculty of Science, University of South Bohemia, Branišovská 31, České Budějovice 37005, Czech Republic
| | - Yinghua Shu
- Agroscope, Research Division Agroecology and Environment, Reckenholzstrasse 191, Zurich 8046, Switzerland.,Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, People's Republic of China
| | - Oxana Skoková Habuštová
- Institute of Entomology, Biology Centre CAS, Branišovská 31, České Budějovice 37005, Czech Republic
| | - Jörg Romeis
- Agroscope, Research Division Agroecology and Environment, Reckenholzstrasse 191, Zurich 8046, Switzerland.,Institute of Ecology and Evolution, University of Bern, Baltzerstrasse 6, Bern 3012, Switzerland
| | - Michael Meissle
- Agroscope, Research Division Agroecology and Environment, Reckenholzstrasse 191, Zurich 8046, Switzerland
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Chang X, Lu Z, Shen Z, Peng Y, Ye G. Bitrophic and Tritrophic Effects of Transgenic cry1Ab/cry2Aj Maize on the Beneficial, Nontarget Harmonia axyridis (Coleoptera: Coccinellidae). ENVIRONMENTAL ENTOMOLOGY 2017; 46:1171-1176. [PMID: 28981636 DOI: 10.1093/ee/nvx113] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Indexed: 06/07/2023]
Abstract
Harmonia axyridis (Pallas) is a common and abundant predator in China and may be exposed to Cry toxins that are produced in Bt crops either by feeding on plant parts or by feeding on target or nontarget herbivorous insects. A new Bt maize line, expressing the Cry1Ab/Cry2Aj fused protein, has been developed and should be rigorously assessed for the ecological risks on the natural enemy. Laboratory experiments were carried out to study the effects of this Bt maize on nontarget predator H. axyridis via bitrophic interaction of adult H. axyridis feeding on Bt maize pollen and tritrophic interaction of H. axyridis consuming the lepidopteran prey. Spodoptera exigua (Hübner) neonate larvae were used to transfer Bt protein because they could survive after ingesting transgenic cry1Ab/cry2Aj maize kernels in the previous study. ELISA bioassays confirmed that the Bt protein could be transferred, but diluted through Bt maize-prey-predator. Life history parameters such as survival, development, weight, fecundity, and egg hatching rate were not significantly different when H. axyridis consumed prey that had been reared on Bt maize compared with prey reared on a nontransformed parental control. Furthermore, feeding directly on Bt maize pollen also had no detrimental effects on fitness, survival, and weight of female and male adults. In conclusion, our results indicate that transgenic cry1Ab/cry2Aj maize poses no ecological risks on the nontarget predator H. axyridis.
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Affiliation(s)
- Xue Chang
- State Key Laboratory of Rice Biology & Agricultural Entomology of Ministry of Agriculture, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China
- Key Laboratory of Integrated Pest Management on Crops in Northeast of Ministry of Agriculture, Institute of Plant Protection, Jilin Academy of Agricultural Sciences, Gongzhuling 136100, China
| | - Zengbin Lu
- Maize Research Institute, Shandong Academy of Agricultural Sciences/National Engineering Laboratory of Wheat and Maize/Key Laboratory of Biology and Genetic Improvement of Maize in Northern Yellow-Huai River Plain, Ministry of Agriculture, Jinan 250100, China
| | - Zhicheng Shen
- State Key Laboratory of Rice Biology & Agricultural Entomology of Ministry of Agriculture, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yufa Peng
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Gongyin Ye
- State Key Laboratory of Rice Biology & Agricultural Entomology of Ministry of Agriculture, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China
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Peterson JA, Ode PJ, Oliveira-Hofman C, Harwood JD. Integration of Plant Defense Traits with Biological Control of Arthropod Pests: Challenges and Opportunities. FRONTIERS IN PLANT SCIENCE 2016; 7:1794. [PMID: 27965695 PMCID: PMC5129739 DOI: 10.3389/fpls.2016.01794] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Accepted: 11/15/2016] [Indexed: 05/11/2023]
Abstract
Crop plants exhibit a wide diversity of defensive traits and strategies to protect themselves from damage by herbivorous pests and disease. These defensive traits may be naturally occurring or artificially selected through crop breeding, including introduction via genetic engineering. While these traits can have obvious and direct impacts on herbivorous pests, many have profound effects on higher trophic levels, including the natural enemies of herbivores. Multi-trophic effects of host plant resistance have the potential to influence, both positively and negatively, biological control. Plant defense traits can influence both the numerical and functional responses of natural enemies; these interactions can be semiochemically, plant toxin-, plant nutrient-, and/or physically mediated. Case studies involving predators, parasitoids, and pathogens of crop pests will be presented and discussed. These diverse groups of natural enemies may respond differently to crop plant traits based on their own unique biology and the ecological niches they fill. Genetically modified crop plants that have been engineered to express transgenic products affecting herbivorous pests are an additional consideration. For the most part, transgenic plant incorporated protectant (PIP) traits are compatible with biological control due to their selective toxicity to targeted pests and relatively low non-target impacts, although transgenic crops may have indirect effects on higher trophic levels and arthropod communities mediated by lower host or prey number and/or quality. Host plant resistance and biological control are two of the key pillars of integrated pest management; their potential interactions, whether they are synergistic, complementary, or disruptive, are key in understanding and achieving sustainable and effective pest management.
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Affiliation(s)
- Julie A. Peterson
- Department of Entomology, West Central Research and Extension Center, University of Nebraska–Lincoln, North PlatteNE, USA
| | - Paul J. Ode
- Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort CollinsCO, USA
| | | | - James D. Harwood
- Department of Entomology, University of Kentucky, LexingtonKY, USA
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Paula DP, Souza LM, Andow DA. Sequestration and Transfer of Cry Entomotoxin to the Eggs of a Predaceous Ladybird Beetle. PLoS One 2015; 10:e0144895. [PMID: 26661738 PMCID: PMC4682807 DOI: 10.1371/journal.pone.0144895] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Accepted: 11/24/2015] [Indexed: 11/18/2022] Open
Abstract
In the past 10 years, sequestration of Cry toxins and transfer to offspring has been indicated in three insect species in laboratory studies. This work directly demonstrates the sequestration and intergenerational transfer of Cry1F by the parents of the aphidophagous coccinellid predator, Harmonia axyridis, to its offspring. Recently emerged adults (10 individual couples/cage/treatment) were exposed during 20 days to aphids (100 Myzus persicae each day) that fed on a holidic diet containing 20 μg/mL Cry1F (and a control-group). Egg batches and neonate larvae were monitored daily, and counted and weighed for immunodetection of Cry1F by ELISA. At the end of the bioassay, the parents were weighed and analyzed by ELISA. Cry1F was detected in the offspring, both eggs and neonate larvae, of exposed H. axyridis adults. On average the neonate larvae had 60% of the Cry1F concentration of the eggs from the same egg batch. The Cry1F concentration in the adults was positively correlated with the concentration in their eggs. These three results provided independent evidence of transfer to offspring. No detrimental effects of Cry1F were observed on the age of first reproduction, total number of eggs laid per female, age-specific fecundity, egg development time, hatching rate, or fertility rate. The occurrence and generality of intergenerational transfer of Cry toxins should be investigated in the field to determine its potential ecological implications.
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Affiliation(s)
- Débora P. Paula
- Embrapa Genetic Resources and Biotechnology, Parque Estação Biológica, W5 Norte, P.O. Box 02372, Brasília, DF, 70770–917, Brazil
- * E-mail:
| | - Lucas M. Souza
- Embrapa Genetic Resources and Biotechnology, Parque Estação Biológica, W5 Norte, P.O. Box 02372, Brasília, DF, 70770–917, Brazil
| | - David A. Andow
- Department of Entomology, University of Minnesota, 219 Hodson Hall, 1980 Folwell Ave., St. Paul, Minnesota 55108, United States of America
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