Functional dominance of different aged larvae of Bt-resistant Spodoptera frugiperda (Lepidoptera: Noctuidae) on transgenic maize expressing Vip3Aa20 protein |
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| Institution: | 1. Division of Vascular and Transplant Surgery, Department of Surgery, The Catholic University of Korea, Seoul St. Mary''s Hospital, Seoul, Korea;2. Division of Vascular and Transplant Surgery, Department of Surgery, The Catholic University of Korea, Daejeon St. Mary''s Hospital, Daejoen, Korea;3. Division of Vascular and Transplant Surgery, Department of Surgery, The Catholic University of Korea, Incheon St. Mary''s Hospital, Incheon, Korea;4. Division of Vascular and Transplant Surgery, Department of Surgery, The Catholic University of Korea, Uijeongbu St. Mary''s Hospital, Gyeonggi-do, Korea;5. Division of Vascular and Transplant Surgery, Department of Surgery, The Catholic University of Korea, St. Vincent Hospital, Gyeonggi-do, Korea;6. Division of Nephrology, Department of Internal Medicine, The Catholic University of Korea, Seoul St. Mary''s Hospital, Seoul, Korea;1. Douglas Stephens Surgical Research Laboratory, Murdoch Children’s Research Institute, Parkville, Victoria, Australia;2. Department of Pediatrics, University of Melbourne, Parkville, Victoria, Australia;3. Urology Department, Royal Children’s Hospital, Parkville, Victoria, Australia;4. Medical School, University of Groningen, Groningen, The Netherlands;1. School of Materials Science and Engineering & Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, People?s Republic of China;2. Zhongshan Branch of State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, People?s Republic of China;3. Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, People?s Republic of China;1. Departamento de Entomologia e Acarologia, Escola Superior de Agricultura “Luiz de Queiroz” (ESALQ/USP), Av. Pádua Dias 11, Piracicaba, São Paulo 13418-900, Brazil;2. Monsanto do Brasil Ltda, São Paulo, Brazil;3. Monsanto LLC, Saint Louis, MO, USA;1. Department of Entomology, Louisiana State University Agricultural Center, Baton Rouge, LA, USA;2. Department of Entomology and Nematology, University of Florida, IFAS SWFREC, Immokalee, FL, USA;3. Monsanto Company, St. Louis, MO, USA;4. Dean Lee Research Station, Louisiana State University Agricultural Center, Alexandria, LA, USA |
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| Abstract: | Fall armyworm (FAW), Spodoptera frugiperda (J. E. Smith), is the main target pest of transgenic maize expressing insecticidal proteins from Bacillus thuringiensis Berliner (Bt) in Brazil. To optimize resistance management strategies, we evaluated the functional dominance of different aged larvae of Bt-resistant FAW on Vip3Aa20 maize. We measured the survival and development of Vip3Aa20-resistant, -heterozygote, and -susceptible strains on MIR162 (expressing Vip3Aa20) and Bt11 × MIR162 × GA21 (expressing Vip3Aa20 and Cry1Ab) maize. The resistant strain, from neonate to sixth instar, showed more than 72% survival on Vip3Aa20 maize. From surviving larvae, more than 64 and 54% developed to pupae and adults, respectively. In contrast, heterozygote and susceptible strains showed no larval survival up to fourth instar, and less than 25% larval survival in the fifth and sixth instar on Vip3Aa20 maize. These larvae produced less than 21% of pupae and adults. The development time of FAW strains from neonate-to-adult exposed to Vip3Aa20 maize was similar; however, the resistant strain showed an increase of ～ 2 d when compared to those fed only non-Bt maize. In summary, the resistance of S. frugiperda to Vip3Aa20 maize is functionally recessive from neonate up to fourth instar larvae. However, high larval survival of resistant strain and some survival of heterozygote larvae in advanced instars on Vip3Aa20 maize were observed. These results will be important for designing insect resistance management to Bt maize plants expressing Vip3Aa20 protein in Brazil. |
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| Keywords: | Bt maize Fall armyworm High-dose Seed mixture Insect resistance management |
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