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Sun S, Chen Q, Gao J, Qu M, Chen Z, Wang K, Wang H. Sublethal effects of nitenpyram on the development of silkworm. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 950:175262. [PMID: 39098428 DOI: 10.1016/j.scitotenv.2024.175262] [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: 04/09/2024] [Revised: 07/30/2024] [Accepted: 08/01/2024] [Indexed: 08/06/2024]
Abstract
The utilization of nitenpyram for aphid and whitefly control may induce environmental contamination and negative repercussions on non-target organisms. Formerly, we found that nitenpyram would pollute the peripheral and sub-peripheral areas of the adjacent mulberry orchard. Under acute toxicity conditions, nitenpyram induced oxidative damage in silkworms, affected biological metabolism, synthesis, immunity, and signal transduction. Considering the impact of nitenpyram mist drift on mulberry leaves, we investigated the effects of low concentrations of nitenpyram on silkworms. The results showed that silkworms exposed to 0.17 mg/L, 0.35 mg/L and 0.70 mg/L of nitenpyram (1/40 LC50, 1/20 LC50 and 1/10 LC50) showed obvious poisoning symptoms. The cocoon weight and cocoon shell weight decreased gradually with increases in the concentration, and these decreases prolonged the growth and development time of silkworms and induced the detoxification enzymes carboxylesterase (CarE) and glutathione-S-transferase (GST) to cope with the stress damage caused by nitenpyram. Exposure to low concentrations of nitenpyram downregulates genes involved in the drug metabolism-other enzymes and peroxisome pathway in silkworms. Additionally, through injection of miRNA mimics and inhibitors, we discovered that detoxifying enzyme pathway genes are influenced by bmo-miR-3382-3P, bmo-miR-3213-5P and bmo-miR-133, regulating the immune response of silkworms. This study provides an overall view of the toxicity and detoxification metabolism of nitenpyram in silkworm, and provides a reference for environmental assessment.
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Affiliation(s)
- Shoumin Sun
- Department of Plant Protection, Shandong Agricultural University, Tai'an, Shandong, China
| | - Qiqi Chen
- Department of Plant Protection, Shandong Agricultural University, Tai'an, Shandong, China
| | - Jingwei Gao
- Department of Plant Protection, Shandong Agricultural University, Tai'an, Shandong, China
| | - Minghui Qu
- Department of Plant Protection, Shandong Agricultural University, Tai'an, Shandong, China; Institute of Quality Standard and Testing Technology for Agro-products, Shandong Academy of Agricultural Sciences, Ji'nan, Shandong, China
| | - Zhenzhen Chen
- Department of Plant Protection, Shandong Agricultural University, Tai'an, Shandong, China
| | - Kaiyun Wang
- Department of Plant Protection, Shandong Agricultural University, Tai'an, Shandong, China
| | - Hongyan Wang
- Department of Plant Protection, Shandong Agricultural University, Tai'an, Shandong, China.
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Torres JB, Malaquias JB, Hoddle MS. Neonicotinoid Residues on Filter Paper Lack Insecticidal Activity. NEOTROPICAL ENTOMOLOGY 2024:10.1007/s13744-024-01196-9. [PMID: 39158774 DOI: 10.1007/s13744-024-01196-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Accepted: 07/30/2024] [Indexed: 08/20/2024]
Abstract
Neonicotinoid insecticides are used against agricultural, forest, and urban insect pests. Evaluation of dry neonicotinoid residues on treated filter paper is a commonly used method to determine the toxicity of active ingredients towards target and non-target organisms. Dry residues of four neonicotinoids, acetamiprid, dinotefuran, imidacloprid, and thiamethoxam, on filter paper did not cause significant levels of mortality in Hippodamia convergens (Guérin-Méneville) (Coleoptera: Coccinellidae) and Nezara viridula (L.) (Hemiptera: Pentatomidae) when compared to paired untreated groups. Conversely, nearly 100% mortality was observed when test insects were exposed to dry neonicotinoid residues on leaf discs and glass plate surfaces. On the other hand, dry residues of the pyrethroid bifenthrin on filter paper, leaf disks, and glass plates killed significantly more test insects when compared to untreated groups. Additional bioassays tested the toxicity of acetamiprid and thiamethoxam by evaluating the toxicity of dry residues on (1) the upper and (2) lower surfaces of treated filter paper, (3) on a glass plate underneath treated filter paper, (4) on the upper surface of treated filter paper treated with insecticide and adjuvant, and (5) dried residues on a glass plate after dipping treated filter paper in water and letting the solvent dry on the inert test surface. The results indicated that neonicotinoid insecticides applied to filter paper were adsorbed. Toxic compounds possibly move in between and binding to paper fibers so that no toxic residues were left on treated surfaces. However, adsorbed insecticides were still biologically active when washed out of filter paper and dried on an inert glass surface. The results reported here clearly demonstrate that the toxicity of neonicotinoid insecticides should not be evaluated using filter paper as a test surface.
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Affiliation(s)
- Jorge B Torres
- Departmento de Agronomia-Entomologia, Universidade Federal Rural de Pernambuco, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, Recife, PE, 52171-900, Brazil.
| | - José B Malaquias
- Lab de Entomologia, Centro de Ciências Agrárias, Univ Federal da Paraíba, Areia, PB, Brazil
| | - Mark S Hoddle
- Dept of Entomology, Univ of California, Riverside, CA, USA
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Ashraf H, Agrawal P, Singh N, Maheshwari N, Qamar A. Ortho-Vanillin Ameliorates Spinetoram-Induced Oxidative Stress in the Silkworm Bombyx mori: Biochemical and In Silico Insights. NEOTROPICAL ENTOMOLOGY 2024:10.1007/s13744-024-01191-0. [PMID: 39141216 DOI: 10.1007/s13744-024-01191-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Accepted: 07/14/2024] [Indexed: 08/15/2024]
Abstract
This study investigates the toxic effects of the insecticide spinetoram on the model organism Bombyx mori (Linnaeus) and explores the potential ameliorative properties of O-Vanillin. Sub-lethal concentrations of spinetoram were given to silkworm larvae via oral feed, resulting in reduced body weight, larval length, and impaired cocoon characteristics. A study of the enzymatic and non-enzymatic antioxidants revealed oxidative stress in the gut, fat body, and silk gland tissues, characterized by decreased antioxidants and increased lipid peroxidation. However, post-treatment with O-Vanillin effectively mitigated these toxic effects, preserving antioxidant capacities and preventing lipid peroxidation. Additionally, O-Vanillin prevented the loss of body weight and improved cocoon characteristics. At the histological level, spinetoram exposure caused mild histological damage in the gut, fat body, and silk gland. However, O-Vanillin post-treatment had ameliorative effects and mitigated the histological damages. To delve deeper into the mechanism of amelioration of O-Vanillin, in silico studies were used to study the interaction between an important xenobiotic metabolism protein of the Bombyx mori, i.e., Cytochrome p450, specifically CYP9A19, and O-Vanillin. We performed blind molecular docking followed by molecular dynamic simulation, and the results demonstrated stable binding interactions between O-Vanillin and CYP9A19, a cytochrome P450 protein in silkworm, belonging to the subfamily CYP9A, suggesting a potential role for O-vanillin in modulating xenobiotic metabolism.
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Affiliation(s)
- Hashim Ashraf
- Section of Entomology, Dept of Zoology, Aligarh Muslim Univ, Aligarh, 202002, India
| | - Pallavi Agrawal
- Dept of Biosciences and Bioengineering, Indian Institute of Technology, Roorkee, Uttarakhand, India
| | - Neha Singh
- Section of Entomology, Dept of Zoology, Aligarh Muslim Univ, Aligarh, 202002, India
| | | | - Ayesha Qamar
- Section of Entomology, Dept of Zoology, Aligarh Muslim Univ, Aligarh, 202002, India.
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Rattanapan A, Sujayanont P. Impact of Neem Seed Extract on Mortality, Esterase and Glutathione-S-Transferase Activities in Thai Polyvoltine Hybrid Silkworm, Bombyx mori L. INSECTS 2024; 15:591. [PMID: 39194796 DOI: 10.3390/insects15080591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2024] [Revised: 07/24/2024] [Accepted: 08/01/2024] [Indexed: 08/29/2024]
Abstract
Neem, a biopesticide, offers a safer alternative to the synthetic insecticides commonly used in mulberry cultivation, which can harm silkworms. This study aimed to investigate the effects of Thai neem seed extract on all instar larvae of the Thai polyvoltine hybrid silkworm, Bombyx mori L., Dok Bua strains, focusing on the mortality rate and the activities of esterase (EST) and glutathione S-transferases (GST) enzymes. Acute toxicity was assessed using the leaf-dipping method. Results showed that the mortality rate tended to be higher in younger instars than in older ones. The first instar larvae exhibited the highest mortality rate at 94%, whereas the LC50 was highest in the third instar at 5.23 mg L-1 at 72 h. This trend aligns with the activities of EST and GST, which were evaluated in the whole bodies of the first instar larvae and the midgut tissue of fifth instar larvae. As the extract concentration increased, EST activity decreased while GST activity increased in both the first and fifth instar larvae. These findings highlight that neem extract is toxic to all instar larvae, with GST playing a crucial role in detoxification, particularly in the whole body of the Thai polyvoltine hybrid silkworm.
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Affiliation(s)
- Ajin Rattanapan
- Department of Biology, Faculty of Science, Mahasarakham University, Kantharawichai District, Mahasarakham 44150, Thailand
- Center of Excellence for Mulberry and Silk, Mahasarakham University, Kantharawichai District, Mahasarakham 44150, Thailand
| | - Patcharawan Sujayanont
- Department of Preclinic, Faculty of Medicine, Mahasarakham University, Muang District, Mahasarakham 44000, Thailand
- Tropical Health Innovation Research Unit, Mahasarakham University, Muang District, Mahasarakham 44000, Thailand
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Wang Z, Wang S, Li L, Chen L, Gao Y, Yuan M, Wang Y, Shi S. The Effect of Different Thiamethoxam Concentrations on Riptortus pedestris Development and Fecundity. TOXICS 2024; 12:460. [PMID: 39058112 PMCID: PMC11280779 DOI: 10.3390/toxics12070460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2024] [Revised: 06/22/2024] [Accepted: 06/24/2024] [Indexed: 07/28/2024]
Abstract
The stink bug, Riptortus pedestris (Fabricius) (Hemiptera: Alydidae), is a highly destructive pest that significantly damages legume crops in East and South Asia. Neonicotinoid insecticides containing thiamethoxam are widely used to control R. pedestris in soybean fields. However, the current knowledge on the impact of different thiamethoxam concentrations on R. pedestris growth and reproduction is lacking and insufficient. The present study investigated the effects of thiamethoxam on the biological traits of R. pedestris after treatment with LC10 (19.8 mg/L), LC20 (31.6 mg/L), LC30 (44.2 mg/L), LC40 (58.9 mg/L), and LC50 (77.0 mg/L) concentrations. These five thiamethoxam concentrations (LC10~LC50) reduced adult longevity and fecundity in the F1 generation females. Thiamethoxam treatment also significantly decreased the population trend index, intrinsic rate of increase, net reproductive rate, gross reproductive rate, and finite rate of increase and increased the mean generation time. These results show that thiamethoxam hinders and suppresses the development and growth of the F1 population of R. pedestris. Thiamethoxam is recommended for spray control during peak adult emergence, as it not only has a controlling effect on the parental generation but also a negative impact on the F1 generations.
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Affiliation(s)
- Zijie Wang
- College of Plant Protection, Jilin Agricultural University, Changchun 130118, China; (Z.W.); (L.L.); (S.S.)
- Jiamusi Branch of Heilongjiang Academy of Agricultural Sciences, Jiamusi 154007, China
| | - Song Wang
- College of Plant Protection, Jilin Agricultural University, Changchun 130118, China; (Z.W.); (L.L.); (S.S.)
| | - Lixia Li
- College of Plant Protection, Jilin Agricultural University, Changchun 130118, China; (Z.W.); (L.L.); (S.S.)
| | - Lei Chen
- College of Plant Protection, Jilin Agricultural University, Changchun 130118, China; (Z.W.); (L.L.); (S.S.)
| | - Yu Gao
- College of Plant Protection, Jilin Agricultural University, Changchun 130118, China; (Z.W.); (L.L.); (S.S.)
- Key Laboratory of Soybean Disease and Pest Control, Ministry of Agriculture and Rural Affairs, Changchun 130118, China
| | - Ming Yuan
- Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar 161006, China
| | - Yueying Wang
- Suzhou Academy of Agricultural Sciences, Suzhou 234099, China
| | - Shusen Shi
- College of Plant Protection, Jilin Agricultural University, Changchun 130118, China; (Z.W.); (L.L.); (S.S.)
- Key Laboratory of Soybean Disease and Pest Control, Ministry of Agriculture and Rural Affairs, Changchun 130118, China
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Khurshid A, Inayat R, Basit A, Mobarak SH, Gui SH, Liu TX. Effects of thiamethoxam on physiological and molecular responses to potato plant (Solanum tuberosum), green peach aphid (Myzus persicae), and parasitoid (Aphidius gifuensis). PEST MANAGEMENT SCIENCE 2024; 80:3000-3009. [PMID: 38312101 DOI: 10.1002/ps.8006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 01/30/2024] [Accepted: 02/01/2024] [Indexed: 02/06/2024]
Abstract
BACKGROUND To improve integrated pest management (IPM) performance it is essential to assess pesticide side effects on host plants, insect pests, and natural enemies. The green peach aphid (Myzus persicae Sulzer) is a major insect pest that attacks various crops. Aphidius gifuensis is an essential natural enemy of M. persicae that has been applied effectively in controlling M. persicae. Thiamethoxam is a neonicotinoid pesticide widely used against insect pests. RESULTS The current study showed the effect of thiamethoxam against Solanum tuberosum, M. persicae, and A. gefiuensis and the physiological and molecular response of the plants, aphids, and parasitoids after thiamethoxam application. Thiamethoxam affected the physical parameters of S. tuberosum and generated a variety of sublethal effects on M. persicae and A. gefiuensis, including nymph development time, adult longevity, and fertility. Our results showed that different thiamethoxam concentrations [0.1, 0.5, and 0.9 μm active ingredient (a.i.)/L] on different time durations (2, 6, and 10 days) increased the antioxidant enzyme activities SOD, POD, and CAT of S. tuberosum, M. persicae, and A. gefiuensis significantly compared with the control. Our results also showed that different thiamethoxam concentrations (0.1, 0.5, and 0.9 μm a.i./L) on different time durations (2, 6, and 10 days) increased the expression of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), acetylcholinesterase (AChE), carboxylesterase (CarE) and glutathione-S-transferase (GST) genes of S. tuberosum, M. persicae, and A. gefiuensis compared with the control. CONCLUSION Our findings reveal that using thiamethoxam at suitable concentrations and time durations for host plants and natural enemies may enhance natural control through the conservation of natural enemies by overcoming any fitness disadvantages. © 2024 Society of Chemical Industry.
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Affiliation(s)
| | - Rehan Inayat
- Institute of Entomology, Guizhou University, Guiyang, China
| | - Abdul Basit
- Institute of Entomology, Guizhou University, Guiyang, China
| | | | - Shun-Hua Gui
- Institute of Entomology, Guizhou University, Guiyang, China
| | - Tong-Xian Liu
- Institute of Entomology, Guizhou University, Guiyang, China
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