ORIGINAL ARTICLE
Comparative efficacy of solid nano-dispersions and conventional formulations of some insecticides against Spodoptera Littoralis under laboratory and field conditions
Aly Derbalah 1, A-E
,
 
,
 
Amany Hamza 3, A-B,D
,
 
Mohmmed Zidan 2, A-D
,
 
,
 
Reham Kamel 5, A-B
,
 
Saad Morsy 3, A-C
 
 
 
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1
Pesticides Chemistry and toxicology, kafr elsheikh univeristy, Elgaesh street, 33516, kafrelsheikh, Egypt
 
2
Cotton Pesticides Evaluation Department, Plant Protection Research Institute, Cairo university st., 12611, Giza, Egypt
 
3
Pesticides Chemistry and Toxicology, Kafrelsheikh Univeristy, Elgaesh street, 33516, Kafrelshiekh, Egypt
 
4
Department of Biology,, College of Science and Humanities Prince Sattam Bin Abdulaziz University, Al-kharj st, 11942, Al-kharj, Uganda
 
5
Agricultural Engineering Research, Agricultural Research Center, Elgaesh street, 33516, Kafrelshiekh, Egypt
 
 
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
 
 
Submission date: 2024-06-12
 
 
Acceptance date: 2024-08-20
 
 
Online publication date: 2024-09-16
 
 
Corresponding author
Aly Derbalah   

Pesticides Chemistry and toxicology, kafr elsheikh univeristy, Elgaesh street, 33516, kafrelsheikh, Egypt
 
 
 
HIGHLIGHTS
  • • Conventional pesticide formulations have negative environmental impacts.
  • • Developing commercial insecticides to microemulsion formulation are needed.
  • • The efficacy of commercial and microemulsion was evaluated against cotton leaf worm
  • • Microemulsion was more effective than commercial against Spodoptera littoralis
  • • Microemulsion formulation could be recommended in control of cotton leaf worm.
KEYWORDS
TOPICS
ABSTRACT
Owing to the large quantity of pesticides utilized conventional pesticide formulations can have numerous negative environmental impacts such as side effects on human health and pest resistance development. Using nano-pesticide formulations can minimize the quantity of pesticides used, thereby lowering pest control costs, and environmental contamination. This work used self-emulsifying and solidification technology to convert chlorpyrifos, emamectin benzoate, and beta-cyfluthrin to solid nano-dispersions, all of which were examined for their properties and efficacy against the Egyptian cotton leafworm, Spodoptera littoralis (Boisd.). During the preparation of the formulation mixture, solid nano-dispersion particles with sizes ranging from 7 to 400 nm were developed. With the design of the nano-formulation, there were variations in the active ingredient, carrier, surfactant, and pesticide concentration types. The type of active ingredient, carrier, surfactant, and pesticide concentration varied with the nano-formulation design. The nano-formulation with 1 to 5% pesticides, 8% a combination of Nonyl phenol ethoxylated surfactant (Unitop 100) mixed with Geronol surfactant (FF4), and sucrose as a carrier indicated the best polydispersity index, Z-average, and biological activity. Moreover, the surfactant and solvent content in the solid nano-dispersion formulation was lower than in conventional pesticide formulations. Based on the LC50 values, chlorpyrifos, emamectin benzoate, and beta-cyfluthrin solid nano-dispersions were more toxic (LC50 values were 0.17 and 0.07 for emamectin benzoate, 4.61 and 3.61 for beta-cyfluthrin, and 10.06 and 6.74 mg/L for chlorpyrifos after 24 and 48 h of treatment, respectively) than their conventional formulations (LC50 values were 0.85 and 0.36 for emamectin benzoate nano-dispersion, 19.19 and 15.30 for beta-cyfluthrin nano-dispersion, and 27.01 and 26.17 mg/L for chlorpyrifos - nano-dispersion after 24 and 48 h of treatment, respectively) against S. littorralis under laboratory conditions. Under field conditions, chlorpyrifos, emamectin benzoate, and beta-cyfluthrin in nano-dispersion formulations were more effective against cotton leaf worms than the same insecticides in commercial formulation. Thus, nano-formulations could be recommended in pest control where they avoid organic solvents and reduce surfactants, control costs, and environmental pollution.
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
eISSN:1899-007X
ISSN:1427-4345
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