Banca de DEFESA: TAMARA TAÍS DOS SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : TAMARA TAÍS DOS SANTOS
DATE: 27/07/2021
TIME: 08:00
LOCAL: Via Plataforma GoogleMeet
TITLE:

Biological aspects of the parasitoid Billaea rhynchophorae (Blanchard, 1937) (Diptera: Tachinidae)in its host Rhynchophorus palmarum (L., 1758) (Coleoptera: Curculionidae)

KEY WORDS:

Black palm weevil; Biology; Parasitism.

PAGES: 43
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitossanidade
SPECIALTY: Entomologia Agrícola
SUMMARY:

The species Rhynchophorus palmarum (L., 1758) (Coleoptera: Curculionidae), occurring in almost the entire tropical region of the planet, is considered the main pest of coconut (Cocos nucifera L.) and oil palm (Elaeis guineensis Jacq.). Tachinids are very important entomophagous dipterans in the parasitism of borers in America, comprising several species cataloged as parasitoids, which are used for the biological control of harmful insects. Although the first detection of parasitoid flies of the genus Billaea on R. palmarum occurred more than 20 years ago, to date, there is no detailed information about its biology. The aim of this study was to understand the biological aspects of Billaea rhynchophorae (Blanchard, 1937) (Diptera: Tachinidae), to help develop strategies that can be used to control R. palmarum and possibly other related pests. The parasitoids were collected in oil palm plantations, their naturally occurring environment. The collections were carried out in September/2019, December/2019 and November/2020 in Jaguaripe and Taperoá, in the south of the state of Bahia. The cocoons of R. palmarum with the presence of larvae and pupae of B. rhynchophorae, as well as larvae and pupae (live and dead) possibly parasitized and adults of the host were transported to the Entomology Laboratory of Embrapa Tabuleiros Costeiros, Unidade de Execução de Pesquisa e Desenvolvimento de Rio Largo, AL, where the rest of the work was conducted. According to the emergence of the parasitoids, the flies were distributed in wooden cages and fed with the nectarous plant chamomile (Matricaria chamomilla L). The following parameters were evaluated: parasitism index, pupal viability, pupal duration, weight, length and diameter of puparia, sex ratio, longevity of adult insects, number and length of planidia. The means were submitted to analysis of variance and compared by Tukey test at 5% probability, using the SASM–Agri program. The percentage of parasitism of B. rhynchophorae in September/2019 differed statistically from the other collections carried out, with parasitism peaks of more than 60% in December/2019 and November/2020. In laboratory, the mean viability of pupae brought from the field was 41.83%, with mean pupal duration of 45.54 ± 0.27. The sex ratio of the parasitoid flies was 0.59, with a mean longevity of 8.61 ± 0.18 days, with no significant difference between the longevity of males and females. With this study, it was possible to know some of the biological aspects of the parasitoid in the laboratory, serving as a subsidy for carrying out studies aimed at its conservation or introduction into agricultural systems, as a biological control strategy for R. palmarum.

BANKING MEMBERS:
Presidente - 024.985.859-23 - ELIO CESAR GUZZO - USP
Interno - 3007246 - MAURICIO SILVA DE LIMA
Externo à Instituição - ALDOMARIO SANTO NEGRISOLI JUNIOR