Banca de DEFESA: CARLA HELENA MACIEL DE LIMA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : CARLA HELENA MACIEL DE LIMA
DATE: 25/02/2022
TIME: 14:00
LOCAL: Video Conferência
TITLE:

ACTIVITY OF ESSENTIAL OILS Piper aduncum AND Piper marginatum ON COCHENILE Planococcus citri (Risso, 1813) (HEMIPTERA: PSEUDOCOCCIDAE)

KEY WORDS:

KEY WORDS:  Piperaceae, Botanical Insecticide, toxicity, repellent, ovicide.

 

PAGES: 51
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitossanidade
SPECIALTY: Entomologia Agrícola
SUMMARY:

The mealybug Planococcus citri (Risso, 1813) has a worldwide distribution and adapts to different climates and hosts. They are considered difficult to control because of the protection offered by their waxy layer. The most used form of P. citri control is through the use of systemic insecticides, however, the use of these products can increase production costs. Bioactivity of essential oils of the Piper genus have been investigated as promising alternatives to synthetic insecticides. Therefore, this study aimed to evaluate the activity of P. aduncum and P. marginatum essential oils on P. citri, through bioassays of topical toxicity in migratory nymphs; residual toxicity in migratory, second instar nymphs and adult females; repellency; and ovicide. The commercial botanical insecticide Azamax® was used for comparison. The CL's50 values estimated through the concentration-response curve for P. aduncum oil were 2.85 µl/mL for the topical test in migratory nymphs, and 1.83 and 1.50 µl/mL for the residual test in nymphs migratory and second instar, respectively. The estimated CL's50 for P. marginatum oil were 2.36 µl/mL for the topical test on migratory nymphs, and 2.28 and 3.81 µl/mL for the residual test on migratory and second instar nymphs, respectively. The CL's 30 and 50 of the oils estimated through tests with migratory nymphs caused mortality of 23% and 35%; and 25% and 36% of females for P. aduncum and P. marginatum, respectively. In the ovicidal test, CL's 30 and 50 reduced by 13.33% in both CL's of P. aduncum oil; and 11% (CL₃₀) and 20.56% (CL₅₀) with P. marginatum oil at the hatching of P. citri nymphs. In the repellency test, it was possible to verify that the CL₁₀ of P. aduncum was more repellent than the CL₁₀ of P. marginatum.

 

 

 

BANKING MEMBERS:
Presidente - 980615 - CLAUDIO AUGUSTO GOMES DA CAMARA
Externo ao Programa - 3133784 - MARCILIO MARTINS DE MORAES
Externa à Instituição - VANESKA BARBOSA MONTEIRO
Externo à Instituição - MAURICIO SILVA DE LIMA
Externa à Instituição - KAMILLA DE ANDRADE DUTRA