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Microencapsulation of Annona squamosa L. (Annonaceae) seed extract and lethal toxicity to Tetranychus urticae (Koch, 1836) (Acari: Tetranychidae)

Maciel, Anilde da G.S., Trindade, Roseane C.P., Basílio, Irinaldo D., Santana, Antônio Euzébio G., da Silva, José Pedro, Santos, Lucas Adriel T., Silva, Edmilson S., de Freitas, Johnnatan D., do Nascimento, Ticiano G.
Industrial crops and products 2019 v.127 pp. 251-259
Annona squamosa, Canavalia ensiformis, Tetranychus urticae, acaricides, chloroform, ethanol, females, hexane, high performance liquid chromatography, leaves, microencapsulation, microparticles, mortality, particle size, probit analysis, scanning electron microscopy, seed extracts, thermogravimetry, toxicity
Botanic acaricides can be used to control Tetranychus urticae (Koch, 1836) and the microencapsulated formulation of these products makes them more stable. The objective of this work was to microencapsulate extracts of Annona squamosa L. (Annonaceae) seed and evaluate its lethal toxicity to T. urticae. The hexane and ethanol extracts and the microencapsulation were pulverized on leaf disks of jack bean Canavalia ensifomis L. DC (Fabaceae), to evaluate their lethal toxicity. Ten females per disk were transferred and after 72 h the mortality was evaluated. The lethal concentrations were estimated by Probit analysis. Chemical characterization of the chloroform and hydromethanol fractions were performed by high performance liquid chromatography. The microencapsulation was prepared with the hexane extract in a Mini Spray Dryer apparatus. It was characterized by particle size analysis, scanning electron microscopy, and thermogravimetric studies. The hexane and ethanol extracts, and microencapsulated had LC99 of 26.05, 53.27, and 45.26 g/L, respectively. The microencapsulation had smooth microparticles, polydispersity index of 5.872, and five decomposition processes. In conclusion, the microencapsulation of A. squamosa seed extract was efficient in the mortality of the two-spotted spider mite and could be used for its control.