Banca de DEFESA: ALISSON MARTINS ALBINO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ALISSON MARTINS ALBINO
DATE: 29/05/2023
TIME: 14:00
LOCAL: Auditório Embrapa Porto Velho
TITLE:

Evaluation of the insecticidal activity of extracts from leaves of Ephedrantus amazonicus R. E. Fries (Anonaceae) and infrutescences of Piper nigrum L. and Piper tuberculatum Jacq. (Piperaceae) on the coffee borer (Hypothenemus hampei). 

KEY WORDS:

Hypothenemus hampei, Coffee, Piper tuberculatum, Piper nigrum, Ephedranthus amazonicus.

PAGES: 41
BIG AREA: Outra
AREA: Ciências Ambientais
SUMMARY:

Coffee crops are an important agricultural sector in many countries, but they are subject to various pests that can harm both the growth and production of the plants. The coffee berry borer, caused by the insect Hypothenemus hampei, is one of the most relevant pests for coffee culture. Traditionally, chemical control has been widely used to deal with this pest, but it can present risks to human health and the environment. In this context, the search for alternative insect control solutions that reduce the adverse effects of insecticides has become increasingly common. One of these solutions is the use of plants and the use of their chemical components with insecticidal activity as potential tools in pest management. Therefore, the aim of this study was to evaluate the use of botanical extracts with insecticidal potential in the control of H. hampei, as well as the effectiveness of the application routes (topical use, contaminated surface, and spraying). To this end, the study was conducted at the Entomology and Biological Control Laboratory of Embrapa Rondônia and involved the use of infructescences of two species of the Piperaceae family (Piper tuberculatum and Piper nigrum) and leaves of Ephedranthus amazonicus belonging to the Annonaceae family. Initially, the plant material of the three species was collected, and hydroalcoholic extracts were prepared. Subsequently, qualitative phytochemical characterization of the extracts was performed through tests based on coloration and precipitation. The evaluation of insecticidal activity was planned and executed according to a randomized block experimental design, with four replications, consisting of 10 treatments. Each experimental unit consisted of ten borers per Petri dish. The botanical extracts were tested in three contamination routes on the coffee berry borer, namely: topical use, contaminated surface, and spraying. The results showed that the botanical extracts presented secondary metabolites, such as saponins, phenolic compounds, flavonoids, and tannins. Moreover, they were able to cause mortality in the coffee berry borer, although to a lesser extent than the chemical controls. Topical use proved to be the most effective application route, as in this route, the extract of the infructescences of P. tuberculatum presented 81 ± 22.9% mortality, the extract of P. nigrum showed an efficacy of 96 ± 5.7%, and the extract of E. amazonicus 34 ± 2.34%, after 48h of treatment. In this same treatment route, the extract of P. tuberculatum and P. nigrum presented, respectively, the following mean lethal concentration (LC₅₀) values, 4.1 ± 3.32 mg and 5.39 ± 0.78 mg. It was not possible to calculate LC₅₀ values for the extract of E. amazonicus in any of the treatment routes. The present study provided evidence that these botanical extracts can be a promising strategy to be used as a viable alternative to chemical insecticides in the control of the coffee berry borer, offering environmental and health benefits.

COMMITTEE MEMBERS:
Externo à Instituição - CESAR AUGUSTO DOMINGUES TEIXEIRA
Presidente - ***.271.423-** - CLEBERSON DE FREITAS FERNANDES - UFC
Interno - ***.807.827-** - JOSE ROBERTO VIEIRA JUNIOR - UFV
Interno - ***.879.256-** - RODRIGO BARROS ROCHA - EMBRAPA