Controlled‐release alginate‐bentonite polymer gel granules of emamectin benzoate and control efficacy against <i>Spodoptera frugiperda</i>

Zhu, Feng; Zhang, Haiyan; Chen, Caijun; Long, Yujun; GuoHui, Liao; Chen, Minggui; Lixin, Qin; Chen, Xiangyan; He, Yong-Fu; Chen, Zhuo

doi:10.1002/ps.7202

Cited by 6 publications

(11 citation statements)

References 38 publications

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“…The experimental values were basically consistent with the model optimization simulation values, which indicates that the optimization model had good reliability. Response surface method optimization determined the quality of each factor affecting the granule encapsulation efficiency, and the granule formulation optimized by the response surface method was significantly improved compared to the conventional artificial formulation. ,− Typical photographs of Eb·He-loaded composite beads are shown in Figure . The beads obtained were generally spherical in shape and the size varied in the range from 1.1 to 1.5 mm for the composites.…”

Section: Resultsmentioning

confidence: 99%

“…Our previous research has also shown that the effective time of granules for pest control is longer than reported spraying pesticide solutions, and the control efficacy can be significantly improved. 21 In this paper, a series of particles were prepared by using alginate and carboxymethyl chitosan as the substrate and the combination of Eb and He as the model pesticide. The encapsulation rate as an evaluation index via nonlinear mathematical model fitting and the preparation process was optimized.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Emamectin Benzoate·Hexaflumuron Granules Based on Response Surface Methodology

Zhang,

Song,

Long

et al. 2024

ACS Omega

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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.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of Emamectin Benzoate·Hexaflumuron Granules Based on Response Surface Methodology

Zhang,

Song,

Long

et al. 2024

ACS Omega

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“…The Korsmeyer–Peppas and Higuchi’s model have often been used to describe the law and control mechanism of drug release in polymers. ,, In order to understand the release properties of acitretin salt particles, the Korsmeyer–Peppas model (eq ) and Higuchi’s model (eq ) were used to fit the release data of EB. M t / M 0 = k t n M t / M 0 = k t 1 / 2 where M t / M 0 is the drug release rate at time t , k is a constant, and n is the diffusion index. The fitting results are summarized in Table .…”

Section: Resultsmentioning

confidence: 99%

“…The Korsmeyer–Peppas and Higuchi’s model have often been used to describe the law and control mechanism of drug release in polymers. 10 , 33 , 34 In order to understand the release properties of acitretin salt particles, the Korsmeyer–Peppas model ( eq 1 ) and Higuchi’s model ( eq 2 ) were used to fit the release data of EB. where M t / M 0 is the drug release rate at time t , k is a constant, and n is the diffusion index.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the performance of granules can be affected by the filler. Attapulgite, kaolin, diatomite, and other inorganic minerals have a large specific surface area, strong adsorption, and good adhesion and have become important carriers in the pesticide industry. ,− With the development of nanocomposites, the release process can be controlled by the addition of nano-carriers, which can significantly increase pesticide coverage and effectively reduce rainwater erosion . In addition, nanoscale photothermal materials have been used to achieve physical contact with killing pests, effectively reducing the use of chemical pesticides .…”

Section: Introductionmentioning

confidence: 99%

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Distribution of Emamectin Benzoate Granules in Maize Plants by Broadcasting into Maize Leaf Whorls

et al. 2023

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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.

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Uses of biomolecules in development of formulations aiming sustainable agriculture

Campos,

de Oliveira,

Pereira

et al. 2024

Bio-Inoculants in Horticultural Crops

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Controlled‐release alginate‐bentonite polymer gel granules of emamectin benzoate and control efficacy against Spodoptera frugiperda

Cited by 6 publications

References 38 publications

Preparation of Emamectin Benzoate·Hexaflumuron Granules Based on Response Surface Methodology

Preparation of Emamectin Benzoate·Hexaflumuron Granules Based on Response Surface Methodology

Distribution of Emamectin Benzoate Granules in Maize Plants by Broadcasting into Maize Leaf Whorls

Uses of biomolecules in development of formulations aiming sustainable agriculture

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