1
|
Zhang H, Song B, Long Y, Liao G, Chen M, Qin L, Chen X, Zhu F. Preparation of Emamectin Benzoate·Hexaflumuron Granules Based on Response Surface Methodology. ACS OMEGA 2024; 9:15065-15073. [PMID: 38585096 PMCID: PMC10993285 DOI: 10.1021/acsomega.3c09280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 03/05/2024] [Accepted: 03/08/2024] [Indexed: 04/09/2024]
Abstract
In order to obtain particles with an optimal loading rate and encapsulation efficiency and to explore the effects of sodium alginate, carboxymethyl chitosan, and bentonite on the particle loading rate and encapsulation rate, the preparation parameters of particles were optimized by the response surface method. A series of particles with constantly changing components were prepared, and the particle loading rate and encapsulation rate were determined. The release experiment of granules in different mass release media was implemented, and the optimal loading rate and encapsulation efficiency of particles were used to control the fall armyworm (FAW). The results showed that when the amount of sodium alginate was 1.83%, that of carboxymethyl chitosan was 0.41% and that of bentonite was 0.37%. The maximum theoretical value based on the response surface simulation was 92.63%, and the actual value at this ratio was 91.61%, which was 98.90% of the theoretical value. The release assay indicated that the mechanism of particle release in 2, 4, and 6 mL of the release medium was non-Fickian diffusion, and the controlled mechanism in 25 mL of the medium was Fickian diffusion. The beads were spread directly into maize leaf whorls in field production; at 14 days after application, the efficacy reached 91.28-98.82%. The combination of emamectin benzoate and hexaflumuron granules has a good control effect on the FAW.
Collapse
Affiliation(s)
- Haiyan Zhang
- Guizhou Center for Pesticide
Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
| | - Bangyan Song
- Guizhou Center for Pesticide
Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
| | - Yujun Long
- Guizhou Center for Pesticide
Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
| | - Guohui Liao
- Guizhou Center for Pesticide
Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
| | - Minggui Chen
- Guizhou Center for Pesticide
Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
| | - Lixin Qin
- Guizhou Center for Pesticide
Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
| | - Xiangyan Chen
- Guizhou Center for Pesticide
Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
| | - Feng Zhu
- Guizhou Center for Pesticide
Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
| |
Collapse
|
2
|
Yang L, Wang Y, Liang Y, Deng H, Wang J, Dai Y, Guo F, Zhou H, Li S, Ding W. pH-responsive bentonite nanoclay carriers control the release of benzothiazolinone to restrain bacterial wilt disease. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2024; 198:105754. [PMID: 38225096 DOI: 10.1016/j.pestbp.2023.105754] [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: 10/23/2023] [Revised: 12/14/2023] [Accepted: 12/18/2023] [Indexed: 01/17/2024]
Abstract
Ralstonia solanacearum (R. solanacearum) is one of the most devastating pathogens in terms of losses in agricultural production. Bentonite (Bent) is a promising synergistic agent used in development of effective and environmentally friendly pesticides against plant disease. However, the synergistic mechanism of Bent nanoclays with benzothiazolinone (BIT) against R. solanacearum is unknown. In this work, acid-functionalized porous Bent and cetyltrimethylammonium bromide (CTAB) were employed as the core nanoclays, and BIT was loaded into the clay to form BIT-loaded CT-Bent (BIT@CT-Bent) for the control of bacterial wilt disease. BIT@CT-Bent exhibited pH-responsive release behavior that fit the Fickian diffusion model, rapidly releasing BIT in an acidic environment (pH = 5.5). The antibacterial effect of BIT@CT-Bent was approximately 4 times greater than that of the commercial product BIT, and its biotoxicity was much lower than that of BIT under the same conditions. Interestingly, R. solanacearum attracted BIT@CT-Bent into the nanocomposites and induced cytoplasmic leakage and changes in membrane permeability, indicating an efficient and synergistic bactericidal effect that rapidly reduced bacterial density. In addition, BIT@CT-Bent significantly inhibited R. solanacearum biofilm formation and swimming activity, by suppressing the expression of phcA, solR and vsrC. Indeed, exogenous application of BIT@CT-Bent significantly suppressed the virulence of R. solanacearum on tobacco plants, with control effect of 75.48%, 72.08% and 66.08% at 9, 11 and 13 days after inoculation, respectively. This study highlights the potential of using BIT@CT-Bent as an effective, eco-friendly bactericide to control bacterial wilt diseases and for the development of sustainable crop protection strategies.
Collapse
Affiliation(s)
- Liang Yang
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Yao Wang
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Yijia Liang
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Haibin Deng
- Guangdong Tobacco Research Institute, Guangdong 512026, China
| | - Jun Wang
- Guangdong Tobacco Research Institute, Guangdong 512026, China
| | - Yuhao Dai
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Fuyou Guo
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Hong Zhou
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Shili Li
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Wei Ding
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| |
Collapse
|
3
|
Long Y, Zhang H, Liao G, Chen M, Chen X, Qin L, Chen C, Chen Z, Wu X, Zhu F. Distribution of Emamectin Benzoate Granules in Maize Plants by Broadcasting into Maize Leaf Whorls. ACS OMEGA 2023; 8:4209-4219. [PMID: 36743034 PMCID: PMC9893741 DOI: 10.1021/acsomega.2c07402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Accepted: 01/06/2023] [Indexed: 06/18/2023]
Abstract
Good control effects on fall armyworm (FAW) can be obtained by broadcasting emamectin benzoate (EB) granules into maize leaf whorls. However, the distribution of EB in maize plants is not clear. In this study, EB granules were prepared by the rotating granulation method, and the granules were characterized using a Fourier transform infrared spectrometer. The behavior of EB granules in water was observed using a microscope, and in vitro release of EB from granules was also studied. A method for the determination of EB in maize plants, old leaves, grains, and cobs was established by using ultra-performance liquid chromatography-tandem mass spectrometry. The results showed that EB was loaded in granules successfully, and the granules disintegrated slowly in water, so the release of granules could be regulated using various water contents. The prepared EB granules were qualified and stable. The field experiment showed that the concentration of EB in maize leaf whorls could be maintained above 0.23 mg·kg-1 within 3 days after broadcasting EB granules. This ensured that FAW could be killed in a short time. Then, EB gradually transferred to the old leaves. After 21 days of application, the content of EB in the old leaves was 0.07 mg·kg-1, which has long-time control effects on FAW. The control effects of the three doses of granules against Spodoptera frugiperda were higher than 78% after 14 days of application. At the tested dosage, no phytotoxicity to crops was observed. At harvest, neither the maize grain nor the cobs had EB content. New controlled formulations to S. frugiperda were developed and will be suitable for application in mountainous areas where the lack of water resources is a factor.
Collapse
Affiliation(s)
- Yujun Long
- Guizhou
Key Laboratory of Mountain Agricultural Diseases and Insect Pests, Guizhou University, Guiyang550025, China
- Guizhou
Center for Pesticide Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang550006, China
| | - Haiyan Zhang
- Guizhou
Center for Pesticide Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang550006, China
| | - Guohui Liao
- Guizhou
Center for Pesticide Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang550006, China
| | - Minggui Chen
- Guizhou
Center for Pesticide Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang550006, China
| | - Xiangyan Chen
- Guizhou
Center for Pesticide Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang550006, China
| | - Lixin Qin
- Guizhou
Center for Pesticide Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang550006, China
| | - Caijun Chen
- Guizhou
Center for Pesticide Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang550006, China
| | - Zhuo Chen
- State
Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering,
Key Laboratory of Green Pesticide and Agricultural Bioengineering,
Ministry of Education, Guizhou University, Guiyang550025, China
| | - Xiaomao Wu
- Guizhou
Key Laboratory of Mountain Agricultural Diseases and Insect Pests, Guizhou University, Guiyang550025, China
| | - Feng Zhu
- Guizhou
Center for Pesticide Risk Monitoring, Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang550006, China
- State
Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering,
Key Laboratory of Green Pesticide and Agricultural Bioengineering,
Ministry of Education, Guizhou University, Guiyang550025, China
| |
Collapse
|