Banca de DEFESA: ALESKA BATISTA DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ALESKA BATISTA DA SILVA
DATE: 30/03/2021
TIME: 09:00
LOCAL: Plataforma Google Meet
TITLE:

PLASTER AS AN ESSENTIAL OIL DISPERSING AGENT IN STORED GRAIN PEST CONTROL

KEY WORDS:

Alternative Control, Formulation, Inert Powder, Mentha piperita, S. zeamais.

PAGES: 50
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitossanidade
SPECIALTY: Entomologia Agrícola
SUMMARY:

The stored grain pests, depending on the population level, can cause total deterioration of the products. The control of these pest insects is usually done through purge or fumigation, but studies using secondary compounds obtained from plants, mainly with essential oils and vegetable powders, have expanded, due to the proven efficiency in research of these against stored grain pests. However, its use in practice is still a challenge for research, as it is volatile, it disperses very quickly, losing its effect with great ease. Thus, the objective of this work was to develop a natural dispersant based on plaster to facilitate the application in practice of the essential oil of Mentha piperita in the control of adults of Sitophilus zeamais Mots. 1763 (Coleoptera: Curculionidae). Each dispersant was prepared with a mixture of 8.5 g of plaster in 5.5 ml of water, being molded in aluminum forms of 0.3 x 0.2 x 0.1 cm. The evaluations of the efficiency of the plaster dispersant were made by the following tests: of fumigation in glass containers of 1.3 L of capacity with 20 adults of S. sitophilus, up to 15 days of age, not sexed, being evaluated with 48h at percentage of mortality; and repellency, in arenas made up of three linearly interconnected glass containers, with 20 g of corn kernels being added to the end containers, constituting the container without treatment (control) on one side and on the other side, the treatments and, in the central container, 16 non-sexed adults of S. zeamais up to 15 days of age were released. After 48 h, the insects contained in each container were quantified, for the evaluation of repellency using the formula: I.R. = 2G / (G + P). The treatments and, in the central container, 16 non-sexed adults of S. zeamais up to 15 days old were released. After 48 h, the insects contained in each container were quantified, for the evaluation of repellency using the formula: I.R. = 2G / (G + P). The persistence of the fumigant and repellent effects of essential oil and plaster dispersant was also evaluated. In the fumigation test, with essential oil and plaster dispersant, the LC₅₀ was estimated at 23.78; 34.32 and CL₉₉ of 54.27; 79.28 μL 40g of grains, respectively. For the contact test with essential oil only, the sublethal and lethal concentrations were (CL₅₀) 25.84 and (CL₉₉) 48.40 μL 40g of grains, respectively. For the contact test with essential oil only, the sublethal and lethal concentrations were (CL₅₀) 25.84 and (CL₉₉) 48.40 μL 40g of grains, respectively. In the repellency test, only the concentration of 26 μL was repellent for both the essential oil and the dispersant. In the assessment of persistence, the repellent and fumigant effect of essential oil and plaster dispersant were 15 and 24 days, and 21 and 30 days, respectively. Thus, it is concluded that the plaster dispersant proved to be quite promising, as it has a fumigant and repellent effect against S. zeamais, and contributed to a greater persistence when compared to the application of oil without the dispersant. This result is innovative in the area of alternative control with stored grain pests.

BANKING MEMBERS:
Presidente - 2337920 - ROSEANE CRISTINA PREDES TRINDADE
Interna - 1389433 - MARIANA OLIVEIRA BREDA
Externa à Instituição - SOLANGE MARIA DE FRANÇA - UFPI