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Stirle JL, Matias JEF, Mendes GR, Moscardini VF, Maia JB, Michaud JP, Gontijo PC. Differential susceptibility of Spodoptera frugiperda (Lepidoptera: Noctuidae) to single versus pyramided Bt traits in Brazilian soybean: what doesn't kill you makes you stronger? PEST MANAGEMENT SCIENCE 2024. [PMID: 39189544 DOI: 10.1002/ps.8391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Revised: 07/18/2024] [Accepted: 08/12/2024] [Indexed: 08/28/2024]
Abstract
BACKGROUND Lepidopteran pest control in agriculture has become heavily dependent on cultivars that express Bacillus thuringiensis (Bt) toxins as 'plant-incorporated protectants'. However, populations of Spodoptera frugiperda (Smith) in Brazil appear resistant to the Bt traits currently available in commercial soybean cultivars. RESULTS This study evaluated S. frugiperda life history when feeding on three different Bt soybean cultivars. Cultivars expressing Cry1Ac + Cry1F and Cry1A.105 + Cry2Ab2 + Cry1Ac Bt toxins caused 100% larval mortality in S. frugiperda. Both non-Bt and Cry1Ac-expressing soybean induced transgenerational effects that increased the survival of subsequent generations. A Cry1Ac soybean diet reduced the generation time (T) of S. frugiperda relative to non-Bt soybean, resulting in shorter generation time and more rapid population growth. CONCLUSION The implications of these results revealed how diet can alter aspects of insect life history and biology, and have important implications for sustainable management of S. frugiperda on soybean. © 2024 Society of Chemical Industry.
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Affiliation(s)
| | | | | | | | - Jader Braga Maia
- Departamento de Agronomia, Universidade Federal do Triângulo Mineiro, Iturama, Brazil
| | - J P Michaud
- Department of Entomology, Kansas State University, Agricultural Research Center-Hays, Hays, KS, USA
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Reichert MB, Schneider JR, Wurlitzer WB, Ferla NJ. Impacts of cultivar and management practices on the diversity and population dynamics of mites in soybean crops. EXPERIMENTAL & APPLIED ACAROLOGY 2024; 92:41-59. [PMID: 38036759 DOI: 10.1007/s10493-023-00862-8] [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: 07/19/2023] [Accepted: 11/06/2023] [Indexed: 12/02/2023]
Abstract
The objective of this study was to evaluate the diversity and population dynamics of mites in soybean crops with different cultivars and management practices. The study was conducted in two soybean production fields in the municipalities of Mato Queimado (L1) and Três de Maio (L2), Rio Grande do Sul state, Brazil. Two transgenic cultivars were used, and insecticide applications varied among treatments. Sampling began at the V2 stage, with 60 leaves/area/collection that were sorted, mites were collected and identified using dichotomous keys. A total of 18,100 mites belonging to 12 species were found. Among the species, Tetranychus urticae Koch, Mononychellus planki (McGregor), and Tetranychus ludeni Zacher (Tetranychidae) were the most abundant, whereas the most abundant predatory mites were the phytoseiids Neoseiulus californicus McGregor and Neoseiulus idaeus Denmark and Muma, with N. idaeus being more abundant and present in all areas. The acarofauna was influenced by environmental conditions and management practices. Neoseiulus idaeus was commonly associated with populations of M. planki, T. ludeni, and T. urticae. Neoseiulus californicus tolerated pesticide use but was affected by severe water stress, whereas N. idaeus tolerated periods of low relative humidity and high temperatures.
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Affiliation(s)
- Marliza Beatris Reichert
- Curso de Engenharia Ambiental e Sanitária, FAHOR-Faculdade Horizontina, Campus Arnoldo Schneider, Horizontina, RS, 98920-000, Brasil
| | - Julia Renata Schneider
- Laboratório de Acarologia, UNIVATES-Universidade do Vale do Taquari, Labacari, Lajeado, RS, 95913- 528, Brasil.
- PPG em Biotecnologia, Universidade do Vale do Taquari, Lajeado, RS, 95914-014, Brasil.
| | - Wesley Borges Wurlitzer
- Laboratório de Acarologia, UNIVATES-Universidade do Vale do Taquari, Labacari, Lajeado, RS, 95913- 528, Brasil
- PPG em Biotecnologia, Universidade do Vale do Taquari, Lajeado, RS, 95914-014, Brasil
| | - Noeli Juarez Ferla
- Laboratório de Acarologia, UNIVATES-Universidade do Vale do Taquari, Labacari, Lajeado, RS, 95913- 528, Brasil
- PPG em Biotecnologia, Universidade do Vale do Taquari, Lajeado, RS, 95914-014, Brasil
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Silva-Valenzuela M, Rojas-Martínez RI, Zúñiga-Mayo VM. Chili Pepper Jojutla Morelos ( Capsicum annuum L.), CJ-2018: A Variety Resistant to Bactericera cockerelli. INSECTS 2022; 13:742. [PMID: 36005367 PMCID: PMC9409313 DOI: 10.3390/insects13080742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 07/21/2022] [Accepted: 07/22/2022] [Indexed: 06/15/2023]
Abstract
Chili pepper is a vegetable of worldwide economic and gastronomic importance. The psyllid, Bactericera cockerelli, is an economically important pest in this crop, causing considerable losses in its production. Currently, the application of insecticides is the main way to control B. cockerelli. However, the use of varieties resistant to this insect is a viable alternative for its control and management. In this work, the oviposition rate, development, and survival of B. cockerelli in two native varieties of chili were evaluated. Choice and non-choice trials showed that the B. cockerelli oviposition was reduced on CJ-2018 by 92.17 and 80.18%, respectively, compared to the control. In CM-334, the insect showed a behavior similar to the control in the non-choice test, while in the choice test it laid more eggs on CM-334 compared to the control. The development and survival assay showed that only 1.33% of the eggs managed to reach the adult stage on CJ-2018. In contrast, on CM-334 the survival of B. cockerelli was similar to the control. These results suggest that CJ-2018 presented a resistance based on antixenosis and antibiosis against B. cockerelli.
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Affiliation(s)
- Manuel Silva-Valenzuela
- Postgrado en Fitosanidad-Fitopatología, Colegio de Postgraduados (CP), Campus Montecillo, km 36.5 Carretera México-Texcoco, Montecillo 56230, Estado de México, Mexico
| | - Reyna Isabel Rojas-Martínez
- Postgrado en Fitosanidad-Fitopatología, Colegio de Postgraduados (CP), Campus Montecillo, km 36.5 Carretera México-Texcoco, Montecillo 56230, Estado de México, Mexico
| | - Victor M. Zúñiga-Mayo
- CONACyT, Postgrado en Fitosanidad-Fitopatología, Colegio de Postgraduados (CP), Campus Montecillo, km 36.5 Carretera México-Texcoco, Montecillo 56230, Estado de México, Mexico
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Zhang KX, Li HY, Quandahor P, Gou YP, Li CC, Zhang QY, Haq IU, Ma Y, Liu CZ. Responses of Six Wheat Cultivars (Triticum aestivum) to Wheat Aphid (Sitobion avenae) Infestation. INSECTS 2022; 13:insects13060508. [PMID: 35735845 PMCID: PMC9225215 DOI: 10.3390/insects13060508] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 05/24/2022] [Accepted: 05/25/2022] [Indexed: 02/01/2023]
Abstract
Simple Summary Sitobion avenae Fabricius is an important wheat aphid species in China, causing significant losses to wheat production. Improving host-plant resistance is an effective and environmentally friendly method of aphid control. Sitobion avenae resistance and the total phenolic and flavonoid content accumulation of six wheat cultivars to S. avenae infestation were investigated to elucidate responses of six wheat varieties against S. avenae. Among the six tested wheat cultivars, Yongliang No.15 and Ganchun No.18 demonstrated high resistance to S. avenae. The correlation analysis revealed a positive relationship between total phenol and flavonoid content accumulation and developmental duration (DD), and a negative relationship between accumulation and weight gain (WG) and mean relative growth rate (MRGR). The correlation between flavonoid and biological parameters was statistically stronger than total phenol. Our findings could serve as a theoretical basis for further research into the resistance mechanism of wheat varieties to S. avenae. Abstract Resistant variety screening is widely recommended for the management of Sitobion avenae. The purpose of this study was to assess responses of six wheat varieties (lines) to S. avenae. The aphid quantity ratio (AQR) was used to assess S. avenae resistance. Pearson’s correlation coefficient was used to perform a correlation analysis between AQR, biological parameters, and the accumulation of total phenolic and flavonoid content. When compared to the other cultivars, the results showed that two cultivars, Yongliang No.15 and Ganchun No.18, had high resistance against S. avenae. The correlation analysis revealed a positive relationship between total phenol and flavonoid content accumulation and developmental duration (DD), and a negative relationship between accumulation and weight gain (WG) and mean relative growth rate (MRGR). The correlation between flavonoid and biological parameters was statistically stronger than the correlation between total phenol and biological parameters. This research provides critical cues for screening and improving aphid-resistant wheat varieties in the field and will aid in our understanding of the resistance mechanism of wheat varieties against S. avenae.
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Affiliation(s)
- Ke-Xin Zhang
- Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province, College of Plant Protection, Gansu Agricultural University, Lanzhou 730070, China; (K.-X.Z.); (Y.-P.G.); (C.-C.L.); (Q.-Y.Z.); (I.U.H.); (Y.M.)
| | - Hong-Yan Li
- Wuwei Shiyanghe Forestry General Field, Wuwei 733000, China;
| | - Peter Quandahor
- CSIR-Savanna Agricultural Research Institute, Tamale P.O. Box TL 52, Ghana;
| | - Yu-Ping Gou
- Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province, College of Plant Protection, Gansu Agricultural University, Lanzhou 730070, China; (K.-X.Z.); (Y.-P.G.); (C.-C.L.); (Q.-Y.Z.); (I.U.H.); (Y.M.)
| | - Chun-Chun Li
- Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province, College of Plant Protection, Gansu Agricultural University, Lanzhou 730070, China; (K.-X.Z.); (Y.-P.G.); (C.-C.L.); (Q.-Y.Z.); (I.U.H.); (Y.M.)
| | - Qiang-Yan Zhang
- Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province, College of Plant Protection, Gansu Agricultural University, Lanzhou 730070, China; (K.-X.Z.); (Y.-P.G.); (C.-C.L.); (Q.-Y.Z.); (I.U.H.); (Y.M.)
| | - Inzamam Ul Haq
- Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province, College of Plant Protection, Gansu Agricultural University, Lanzhou 730070, China; (K.-X.Z.); (Y.-P.G.); (C.-C.L.); (Q.-Y.Z.); (I.U.H.); (Y.M.)
| | - Yue Ma
- Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province, College of Plant Protection, Gansu Agricultural University, Lanzhou 730070, China; (K.-X.Z.); (Y.-P.G.); (C.-C.L.); (Q.-Y.Z.); (I.U.H.); (Y.M.)
| | - Chang-Zhong Liu
- Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province, College of Plant Protection, Gansu Agricultural University, Lanzhou 730070, China; (K.-X.Z.); (Y.-P.G.); (C.-C.L.); (Q.-Y.Z.); (I.U.H.); (Y.M.)
- Correspondence:
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