Banca de DEFESA: DENILSON DE LIMA SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DENILSON DE LIMA SANTOS
DATE: 28/07/2025
TIME: 14:00
LOCAL: Auditório do Departamento de Química
TITLE:

TOXICITY OF ESSENTIAL OILS FROM Croton L. PLANTS ON Euborellia annulipes (Lucas, 1847) (DERMAPTERA: ANISOLABIDIDAE) and on the pest Plutella xylostella (Linnaeus, 1767) (Lepidoptera: pluellidae)

KEY WORDS:

Natural enemy; selectivity; mortality; oviposition; predation; repellency.

PAGES: 62
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitossanidade
SPECIALTY: Entomologia Agrícola
SUMMARY:

Sustainable alternatives such as the combination of botanical insecticides and biological control represent a promising strategy to reduce the use of synthetic insecticides. Plants of the genus Croton, common in biomes such as the Caatinga, stand out as sources of essential oils with insecticidal properties. In addition, the use of generalist predators, such as Euborellia annulipes, has proven effective in controlling several pests. This study evaluated the toxicity of essential oils from Croton blanchetianus Baill and Croton heliotropiifolius Kunth on E. annulipes: their effects on reproduction, feeding preference and repellency of this predator, and their lethality against the pest Plutella xylostella. Laboratory bioassays were conducted with fifth-instar nymphs of E. annulipes exposed to concentrations of Croton oils and the negative control Lambda-cyhalothrin. Mortality, oviposition time, fecundity, egg and nymph viability, and repellency of contaminated substrate were evaluated. For predation tests, contaminated and uncontaminated third-instar P. xylostella caterpillars were offered, allowing the predator to choose. The oils demonstrated that Croton oils presented the same level of toxicity to P. xylostella and low toxicity to E. annulipes. Although C. blanchetianos caused a reduction in the number of eggs laid by E. annulipes, this fact did not compromise the viability of eggs and nymphs. Croton oils did not consistently compromise the consumption of P. xylostella by E. annulipes. However, the presence of oils in treated substrates caused a strong repellent action on E. annulipes, which may reduce its permanence in treated areas. Thus, the oils of C. blanchetianus and C. heliotropiifolius demonstrate potential for use in integrated pest management as they do not cause significant damage to their reproduction and consumption of prey, but their application needs to consider the repellency caused to natural enemies.

COMMITTEE MEMBERS:
Presidente - CLAUDIO AUGUSTO GOMES DA CAMARA
Externa à Instituição - MAYARA FERNANDES DOS SANTOS
Externo à Instituição - WENDEL JOSE TELES PONTES