Banca de QUALIFICAÇÃO: SARAH RUTH ALVES DA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : SARAH RUTH ALVES DA SILVA
DATE: 31/01/2025
TIME: 09:00
LOCAL: Virtual GOOGLE MEET: https://meet.google.com/mka-squq-shv
TITLE:

Essential oil of wild rosemary (Lippia grata Schauer): insecticidal potential
against Chrysomya megacephala under laboratory conditions

 

KEY WORDS:

Lippia. Bioinsecticide. Natural insecticide.

PAGES: 60
BIG AREA: Ciências Biológicas
AREA: Parasitologia
SUMMARY:

The Diptera order encompasses a wide range of species distributed
worldwide. Members of the Calliphoridae family are important carriers of pathogens and causative agents of
myiasis, representing a serious public health problem. The species Chrysomya megacephala stands out in
this family due to its medical and veterinary importance and its wide distribution. The use of synthetic
insecticides is the primary form of control for these insects and has led to the development of resistance and
environmental problems. In response, research with essential oils has shown promising potential as an
alternative control strategy. The literature records the use of endemic Brazilian species of the genus Lippia
sp. as natural insecticides, and previous studies indicate the insecticidal potential of the species Lippia grata
against some medically important insects, but its use against muscoid flies, such as C. megacephala, is still
little explored. This study aimed to evaluate the insecticidal potential of Lippia grata essential oil against C.
megacephala. Insects were collected in the field and maintained in the laboratory for bioassays. The L. grata
essential oil was obtained through hydrodistillation, and its chemical characterization was performed at the Chemistry Institute of UFRN. The adulticidal bioassay with the oil used concentrations between 3.125% and
100% applied topically (3 µL). Mortality was evaluated at a predetermined time, and the lethal concentration
50% (LC50) and 99% (LC99) were calculated by probit analysis. Carvacrol stood out as the major
component (46.56% and 51.91%) of the total oil composition. The LC50 and LC99 were 6.45% and 62.86%,
respectively, for the adulticidal tests after 24h. The analysis generated a typical dose-response curve,
showing the direct relationship between the concentration of the substance and the mortality of individuals.
The results suggest that L. grata essential oil may be a promising alternative for the control of Chrysomya
megacephala, offering a more natural and less environmentally harmful approach compared to synthetic
insecticides.

 

 

COMMITTEE MEMBERS:
Interna - 1049952 - DEYSIANE OLIVEIRA BRANDAO
Presidente - 1715271 - RENATA ANTONACI GAMA
Externo à Instituição - TACIANO DE MOURA BARBOSA - UFPE