Banca de QUALIFICAÇÃO: JESSICA D`AVILLA DE ASSIS

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : JESSICA D`AVILLA DE ASSIS
DATE: 19/02/2026
TIME: 14:00
LOCAL: http://meet.google.com/tib-rhbs-fjz
TITLE:

Insect Growth Disruptors in the Control of Cochliomyia hominivorax (Diptera, Calliphoridae)

KEY WORDS:

Myiasis; juvenile hormone analogues; benzoylphenylureas

PAGES: 62
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUMMARY:

In Brazil, Cochliomyia hominivorax is the most important causative species of primary myiasis in livestock, companion animals, and humans, highlighting the social and economic relevance of myiasis to both animal and public health. Chemical control remains one of the main strategies for its management. In the present study, first-instar larvae (L1) of C. hominivorax obtained from a laboratory colony (CEUA 8634020223) were exposed to different concentrations of the insect growth disruptors (IGDs) diflubenzuron, fluazuron, teflubenzuron, triflumuron, and pyriproxyfen. Larvae were challenged using a larval diet supplemented with the active compounds at concentrations of 0.001, 0.005, 0.01, 0.05, 0.1, 0.5, 1, 25, 50, and 100 µg·mL⁻¹, distributed into 12 groups with six replicates each and ten larvae per replicate, totaling 720 larvae. A control group containing only the larval diet and a solvent group containing the larval diet plus the formulation diluent (16% acetone and two drops of Tween 80) were included. Data were analyzed regarding interference with pupal development (pupation inhibition) and adult emergence (emergence inhibition). Pupation inhibition was assessed from larva-to-pupa development, evaluating larval mortality during this process; larvae that failed to form pupae were considered dead and expressed as percentage mortality. Emergence inhibition was evaluated from larva-to-adult development. Probit analysis was performed to estimate lethal concentrations using RStudio software. At concentrations equal to or greater than 0.5 µg·mL⁻¹, diflubenzuron, teflubenzuron, triflumuron, and pyriproxyfen promoted high levels of adult emergence inhibition, reaching 100%. For pyriproxyfen, 100% emergence inhibition was observed only from 1 µg·mL⁻¹ onward. Fluazuron, in turn, showed a more gradual increase in efficacy, with 56.7% inhibition at 0.5 µg·mL⁻¹, 68.3% at 1 µg·mL⁻¹, and 100% only at concentrations equal to or greater than 25 µg·mL⁻¹. The CL₅₀ values for pupation inhibition, in ascending order, were 0.01 µg·mL⁻¹, 0.07 µg·mL⁻¹, 0.15 µg·mL⁻¹, 3.82 µg·mL⁻¹, and 5.14 µg·mL⁻¹ for diflubenzuron, triflumuron, fluazuron, teflubenzuron, and pyriproxyfen, respectively. For emergence inhibition, the CL₅₀ values in ascending order were 0.01 µg·mL⁻¹, 0.03 µg·mL⁻¹, 0.10 µg·mL⁻¹, 0.05 µg·mL⁻¹, and 0.06 µg·mL⁻¹.

COMMITTEE MEMBERS:
Presidente - 2929889 - THAIS RIBEIRO CORREIA AZEVEDO
Interna - ***.630.647-** - BARBARA RAUTA DE AVELAR - UFJF
Interno - 1173660 - FABIO BARBOUR SCOTT
Interna - 3161989 - GABRIELA FERREIRA DE OLIVEIRA
Externo à Instituição - LIVIO MARTINS COSTA JUNIOR - UFMA