Banca de DEFESA: LAYSA DIAS FERREIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LAYSA DIAS FERREIRA
DATE: 31/10/2025
TIME: 15:00
LOCAL: Auditório do Departamento de Química
TITLE:

INFLUENCE OF THE ESSENTIAL OIL OF Melaleuca leucadendra (L.) L. AND ITS MAJOR CONSTITUENT ON THE PREDATORY AND REPRODUCTIVE CAPACITY OF Neoseiulus idaeus DENMARK & MUMA (ACARI: PHYTOSEIIDAE)

KEY WORDS:

T. urticae, natural enemies, sublethal effects, natural products

PAGES: 56
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitossanidade
SPECIALTY: Entomologia Agrícola
SUMMARY:

The commercialization of natural enemies is an important tool used in biological pest control. Predatory mite species are registered with the Ministry of Agriculture and Livestock (MAPA) and marketed for the management of the pest mite Tetranychus urticae. A commercial predator specializing in preying on mites of the Tetranychidae family is Neoseiulus idaeus, which is widely distributed in arid environments. As for chemical control, the use of selective products of botanical origin, such as essential oils and isolated plant compounds, is considered an alternative for the management of T. urticae. Thus, this study aimed to evaluate the possible selectivity of EO extracted from Melaleuca leucadendra leaves and its major constituent on N. idaeus. To this end, bioassays were conducted to evaluate the mortality of N. idaeus when subjected to a concentration indicated for field use (LC80) of EO and its main compound, estimated for the control of T. urticae. Effects on parameters such as functional response and fertility of F1 of the predator species when exposed to sublethal concentrations (LC30) of the oil and compound mentioned above were also evaluated, in addition to the positive control Azamax®. Through chemical analysis and identification of the EO of M. leucadendra, sesquiterpene (E)-Nerolidol was observed to be the major component, corresponding to 95.48%. Residual contact tests of M. leucadendra and (E)-Nerolidol on T. urticae showed average lethal concentrations (LC50) of 6.28µl/mL and 6.91µl/mL, respectively, with no statistical difference. Azamax®, on the other hand, had an LC50 of 2.49 µl/mL, being more toxic to T. urticae than EO and the compound. In toxicity tests on N. idaeus with LC80, it was observed that while EO and Azamax® presented mortality rates considered non-toxic, the isolated compound was slightly toxic to the predatory mite. Functional response experiments indicated that EO and the compound did not compromise the predatory capacity of N. idaeus, promoting a type II functional response, similar to the control result, with only an increase in prey handling time. Azamax®, on the other hand, was able to alter the functional response of the predatory mite to type I. Regarding the F1 fertility experiment, OE and the compound caused a reduction in the oviposition of N. idaeus in F0, while in F1, the compound and Azamax® caused this decrease. Therefore, the results obtained through this study have the potential to contribute to the sustainable management of the striped mite, providing support for integrated pest management (IPM) programs.

COMMITTEE MEMBERS:
Interno - CLAUDIO AUGUSTO GOMES DA CAMARA
Externa à Instituição - CAROLINA ALVES DE ARAUJO - UFRPE
Externa à Instituição - GIRLEIDE VIEIRA DE FRANÇA BELTRÃO