Does microemulsification improve the insecticidal activity of cypermethrin against the melon aphid, Aphis gossypii (Hemiptera: Aphididae)?

Document Type : Original Research

Authors
Zohre Farhadi 1
Masumeh Ziaee 1
Mehdi Esfandiari 1
Anayatollah Salimi 2
Arash Rasekh 1
1 Department of Plant Protection, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
2 Department of Pharmaceutics, Faculty of Pharmacy, Jundishapur University of Medical Sciences, Ahvaz, Iran.
10.48311/jcp.2024.1665
Abstract
The melon aphid, Aphis gossypii Glover (Hemiptera: Aphididae) is one of the important ornamental plant pests in urban regions. In this study, the microemulsion system was developed using cypermethrin insecticide as the active ingredient, xylene as the solvent, and surfactants including Tensiofix 8427 + SDS, and Tensiofix 8427 + SLS, and 1-butanol (cosurfactant), as stabilizer. The optimal microemulsion formulation was determined using a pseudo-ternary phase diagram using the water titration method. The microemulsions mean droplet sizes were in the range 11.2–22.8 nm. The droplets of all three formulations were spherical and uniformly dispersed in water. The mortality percentage was 66.66, 56.66, and 55.00% 24 h after aphids exposure to C1-250 (cypermethrin: Tensiofix 8427 + SDS + 1-butanol: water, at the ratio of 10:20:70), C2-250 (cypermethrin: Tensiofix 8427 + SLS + 1-butanol: water, at the ratio of 10:20:70), and C3-250 (cypermethrin: Tensiofix 8427 + SLS + 1-butanol: water, at the ratio of 15:30:55), which increased to 92.86, 89.29, and 83.94%, 48 h after exposure, respectively. The results revealed that the microemulsion formulation containing cypermethrin 250 g/L was more effective in controlling A. gossypii than cypermethrin technical material and 150 g/L cypermethrin-based microemulsion.
Keywords
Cypermethrin
green space
Microemulsion
phase behavior
surfactant
Zeta potential

Subjects

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Journal of Crop Protection
Volume 13, Issue 2
June 2024
Pages 191-208