1
|
Yan W, Zheng Q, Zhu S, Miao X, Yang L, Wu J, Wang B, Zhang Z, Xu H. Coating of maize seeds with acephate for precision agriculture: Safety assessment in earthworms, bees, and soil microorganisms. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 943:173761. [PMID: 38851355 DOI: 10.1016/j.scitotenv.2024.173761] [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: 01/18/2024] [Revised: 05/27/2024] [Accepted: 06/02/2024] [Indexed: 06/10/2024]
Abstract
Acephate is commonly used as a seed treatment (ST) in precision agriculture, but its impact on pollinators, earthworms, and soil microorganisms remains unclear. This study aimed to compare the fate of acephate seed dressing (SD) and seed coating (SC) treatments and assess potential risks to bees, earthworms, and soil microorganisms. Additionally, a follow-up study on maize seeds treated with acephate in a greenhouse was conducted to evaluate the maize growth process and the dissipation dynamics of the insecticide. The results indicated that acephate SC led to greater uptake and translocation in maize plants, resulting in lower residue levels in the soil. However, high concentrations of acephate metabolites in the soil had a negative impact on the body weight of earthworms, whereas acephate itself did not. The potential risk to bees from exposure to acephate ST was determined to be low, but dose-dependent effects were observed. Furthermore, acephate ST had no significant effect on soil bacterial community diversity and abundance compared to a control. This study provides valuable insights into the uptake and translocation of acephate SD and SC, and indicates that SC is safer than SD in terms of adverse effects on bees and nontarget soil organisms.
Collapse
Affiliation(s)
- Wenjuan Yan
- National Key Laboratory of Green Pesticide, South China Agricultural University, Guangzhou, China; Key Laboratory of Natural Pesticide & Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou, China; Guangdong Biological Pesticide Engineering Technology Research Center, South China Agricultural University, Guangzhou, China
| | - Qun Zheng
- National Key Laboratory of Green Pesticide, South China Agricultural University, Guangzhou, China; Key Laboratory of Natural Pesticide & Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou, China; Guangdong Biological Pesticide Engineering Technology Research Center, South China Agricultural University, Guangzhou, China
| | - Shiqi Zhu
- National Key Laboratory of Green Pesticide, South China Agricultural University, Guangzhou, China; Key Laboratory of Natural Pesticide & Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou, China; Guangdong Biological Pesticide Engineering Technology Research Center, South China Agricultural University, Guangzhou, China
| | - Xiaoran Miao
- National Key Laboratory of Green Pesticide, South China Agricultural University, Guangzhou, China; Key Laboratory of Natural Pesticide & Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou, China; Guangdong Biological Pesticide Engineering Technology Research Center, South China Agricultural University, Guangzhou, China
| | - Liupeng Yang
- National Key Laboratory of Green Pesticide, South China Agricultural University, Guangzhou, China; Key Laboratory of Natural Pesticide & Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou, China; Guangdong Biological Pesticide Engineering Technology Research Center, South China Agricultural University, Guangzhou, China
| | - Jian Wu
- National Key Laboratory of Green Pesticide, South China Agricultural University, Guangzhou, China; Key Laboratory of Natural Pesticide & Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou, China; Guangdong Biological Pesticide Engineering Technology Research Center, South China Agricultural University, Guangzhou, China
| | - Botong Wang
- National Key Laboratory of Green Pesticide, South China Agricultural University, Guangzhou, China; Key Laboratory of Natural Pesticide & Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou, China; Guangdong Biological Pesticide Engineering Technology Research Center, South China Agricultural University, Guangzhou, China
| | - Zhixiang Zhang
- National Key Laboratory of Green Pesticide, South China Agricultural University, Guangzhou, China; Key Laboratory of Natural Pesticide & Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou, China; Guangdong Biological Pesticide Engineering Technology Research Center, South China Agricultural University, Guangzhou, China.
| | - Hanhong Xu
- National Key Laboratory of Green Pesticide, South China Agricultural University, Guangzhou, China; Key Laboratory of Natural Pesticide & Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou, China; Guangdong Biological Pesticide Engineering Technology Research Center, South China Agricultural University, Guangzhou, China.
| |
Collapse
|
2
|
Yao G, Han S, Wen Y, Xiao Y, Zhao C, Xu H. Design, synthesis, insecticidal activities and translocation of amino acid-tralopyril conjugates as vectorizing agrochemicals. PEST MANAGEMENT SCIENCE 2023; 79:4018-4024. [PMID: 37278576 DOI: 10.1002/ps.7599] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 05/29/2023] [Accepted: 06/02/2023] [Indexed: 06/07/2023]
Abstract
BACKGROUND Conjugating amino acid moieties to active ingredients has been recognized as an effective method for improving the precise targeting of the active form to the specific site. Based on the vectorization strategy, a series of amino acid-tralopyril conjugates were designed and synthesized as novel proinsecticide candidates, with the potential capability of root uptake and translocation to the foliage of crops. RESULTS Bioassay results showed excellent insecticidal activities of some conjugates, in particular, the conjugates 6b, 6e, and 7e, against the diamondback moth (Plutella xylostella), with equivalent insecticidal activity to chlorfenapyr (CFP). Importantly, conjugate 6e exhibited significantly higher in vivo insecticidal activity against P. xylostella than CFP. Furthermore, the systemic test experiments with Brassica chinensis demonstrated that conjugates 6e and 7e could be transported to the leaves, in contrast to CFP, which remained in the root. CONCLUSION This study demonstrated the feasibility of amino acid fragment conjugation as a vectorization strategy for transporting non-systemic insecticides into the leaves of B. chinensis while maintaining in vivo insecticidal activity. The findings also provide insights for subsequent mechanism studies on the uptake and transport of amino acid-insecticide conjugates in plants. © 2023 Society of Chemical Industry.
Collapse
Affiliation(s)
- Guangkai Yao
- National Key Laboratory of Green Pesticide; Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education; College of Plant Protection, South China Agricultural University, Guangzhou, China
| | - Shuo Han
- National Key Laboratory of Green Pesticide; Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education; College of Plant Protection, South China Agricultural University, Guangzhou, China
| | - Yingjie Wen
- National Key Laboratory of Green Pesticide; Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education; College of Plant Protection, South China Agricultural University, Guangzhou, China
- Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization, Ministry of Agriculture and Rural Affairs; Guangdong Provincial Key Laboratory of Tropical and Subtropical Fruit Tree Research; Institute of Fruit Tree Research, Guangdong Academy of Agricultural Sciences, Guangzhou, China
| | - Yuyan Xiao
- National Key Laboratory of Green Pesticide; Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education; College of Plant Protection, South China Agricultural University, Guangzhou, China
| | - Chen Zhao
- National Key Laboratory of Green Pesticide; Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education; College of Plant Protection, South China Agricultural University, Guangzhou, China
| | - Hanhong Xu
- National Key Laboratory of Green Pesticide; Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education; College of Plant Protection, South China Agricultural University, Guangzhou, China
| |
Collapse
|
3
|
Godói CTD, Campos SO, Monteiro SH, Ronchi CP, Silva AA, Guedes RNC. Thiamethoxam in soybean seed treatment: Plant bioactivation and hormesis, besides whitefly control? THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 857:159443. [PMID: 36252665 DOI: 10.1016/j.scitotenv.2022.159443] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 09/25/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Abstract
Amid concerns on the myriad of existing chemical stressors in agroecosystems, pesticides and particularly neonicotinoid insecticides are in the forefront. Despite that, these neurotoxic compounds remain the dominant group of insecticides in worldwide use with the added versatility of use in seed coatings. Such use sparks environmental concerns counterbalanced by their reported insecticidal efficacy and potential plant bioactivation. Nonetheless, this alleged double benefit and interconnection expected with neonicotinoids has been little explored particularly when the whole plant phenology is considered. Regardless of the expected efficacy against targeted insect pest species, like whiteflies, neonicotinoids may spark dual effect on plants - negative at higher concentrations, positive at low concentrations, which is consistent with the hormesis phenomenon that may be expressed as a plant bioactivation. This effect may also cascade to the targeted insect species, what deserves attention. Therefore, soybean seeds treated with increasing concentrations of the neonicotinoid thiamethoxam were followed throughout their development in greenhouse, recording the plant response and yield, besides their effect in whiteflies (Bemisia tabaci MEAM1). Thiamethoxam application was correlated to leaf contents of thiamethoxam and its metabolite clothianidin. Plant hormesis was found for leaf area and root growth, but not for other plant morphological or physiological parameters, nor plant yield. The insecticide concentration-dependency compromised whitefly population growth without evidence of cascading any plant-mediated hormesis to the insects. Thus, although plant hormesis was recognized with thiamethoxam in treated soybean seeds in relevant parameters, no evidence of plant bioactivation was observed to justify its use with such a secondary objective, nor did this hormesis impair whitefly control.
Collapse
Affiliation(s)
- C T D Godói
- Departamento de Entomologia, Universidade Federal de Viçosa, Viçosa, MG 36570-900, Brazil
| | - S O Campos
- Departamento de Entomologia, Universidade Federal de Viçosa, Viçosa, MG 36570-900, Brazil
| | - S H Monteiro
- Unidade de Referência Laboratorial em Análise e Pesquisa de Contaminantes em Alimentos e Ambiente, Instituto Biológico, Av. Conselheiro Rodrigues Alves, 1252, São Paulo, SP 04014-900, Brazil
| | - C P Ronchi
- Instituto de Agronomia, Universidade Federal de Viçosa - Campus Florestal, Florestal, MG 35690-000, Brazil
| | - A A Silva
- Departamento de Agronomia, Universidade Federal de Viçosa, Viçosa, MG 36570-900, Brazil
| | - R N C Guedes
- Departamento de Entomologia, Universidade Federal de Viçosa, Viçosa, MG 36570-900, Brazil.
| |
Collapse
|
4
|
Co-Occurrence Patterns of Ustilago nuda and Pyrenophora graminea and Fungicide Contribution to Yield Gain in Barley under Fluctuating Climatic Conditions in Serbia. J Fungi (Basel) 2022; 8:jof8050542. [PMID: 35628797 PMCID: PMC9148124 DOI: 10.3390/jof8050542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Revised: 05/17/2022] [Accepted: 05/20/2022] [Indexed: 11/17/2022] Open
Abstract
The utilization of production systems with reduced chemical input renewed the interest in Ustilago nuda and Pyrenophora graminea. The investigations of seed fungicide treatments are more related to their efficacy than to their contribution to yield gain. The data were collected from research and development trials on fungicide efficacy against U. nuda and P. graminea conducted from 2014 to 2020 in Serbia. Partial least squares, multiple stepwise regression and best subset regression were used for statistical modeling. The total number of plants infected with U. nuda and P. graminea per plot differed significantly in the seven-year period. Shifts in the predominance of one pathogen over the other were also shown. Temperature, total rainfall and relative humidity in flowering time (p < 0.001) influenced the occurrence of both pathogens. The strongest impact on yield loss was observed for temperature in the phenological phases of leaf development (p = 0.014), temperature in flowering time (p < 0.001) and total number of plants infected with U. nuda and P. graminea per plot (p < 0.001). Our results indicated that regression models consisting of both biotic and abiotic factors were more precise in estimating regression coefficients. Neither fungicidal treatment had a stable contribution to yield gain in the seven-year period.
Collapse
|
5
|
Zhang Z, Fan J, Feng M, Qiu H, Hu A. Polymerase Chain Reaction-Assisted Evaluation of the Efficacy of Seed-Treatment Prevention of Sporisorium reilianum Infection in Sorghum Seedlings. Front Microbiol 2021; 12:745144. [PMID: 34777292 PMCID: PMC8586072 DOI: 10.3389/fmicb.2021.745144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Accepted: 09/30/2021] [Indexed: 11/13/2022] Open
Abstract
Head smut, caused by Sporisorium reilianum [(Kuhn) Langdon and Fullerton], is a major disease of sorghum. Seed treatment is considered to be the most effective way to control the disease; however, the pathogen can infect at the seedling stage and the infected plant will not display symptoms until the reproductive stage is reached. The evaluation of the efficacy of seed treatments is time consuming and is dependent upon visible symptoms. Polymerase chain reaction (PCR) methods have the ability to identify pathogens and diagnose their presence at an early stage of infection. In this study, the S. reilianum-specific primer SR3 was used for PCR detection pathogen. We optimized temperature, humidity, and spore quantity test conditions and were able to achieve >88% infection incidence in sorghum seedlings. Sorghum seeds were soaked in various concentrations of tebuconazole and planted for 7 days in soil containing 0.2% teliospores. The efficacy of tebuconazole against S. reilianum was evaluated by PCR and recorded as disease incidence. Results indicated that the reduction in disease incidence after exposure to 0.15, 0.30, 0.45, 0.60, and 0.75 μg/mL tebuconazole was 6.24, 37.48, 67.74, 81.24, and 93.74%, respectively. Significant differences between the concentrations of tebuconazole were observed. The PCR assay represents a valuable tool for evaluating the efficacy of fungicide seed treatments for the control of S. reilianum in sorghum under laboratory conditions.
Collapse
Affiliation(s)
- Zhi Zhang
- College of Agriculture, Maize Institute, Guizhou University, Guiyang, China
| | - Juan Fan
- College of Agriculture, Crop Protection Institute, Guizhou University, Guiyang, China
| | - Mucai Feng
- Agricultural Technology Extension Center, Weifang, China
| | - Hongbo Qiu
- College of Agriculture, Maize Institute, Guizhou University, Guiyang, China
| | - Anlong Hu
- College of Agriculture, Crop Protection Institute, Guizhou University, Guiyang, China
| |
Collapse
|