Banca de DEFESA: KRISLEY SEIBEL TONDIM

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : KRISLEY SEIBEL TONDIM
DATA : 18/05/2022
HORA: 13:30
LOCAL: meet.google.com/srk-gcjt-osr
TÍTULO:

PLANTS OF THE PIPERACEA FAMILY: INSECTICID POTENTIAL ON THE SOYBEAN BEDBUG AND ITS EGG PARASITOID

PALAVRAS-CHAVES:

Euschistus heros, Piper, Telenomus podisi, botanical insecticides.

PÁGINAS: 65
GRANDE ÁREA: Ciências Biológicas
ÁREA: Zoologia
SUBÁREA: Zoologia Aplicada
ESPECIALIDADE: Controle Populacional de Animais
RESUMO:

Soybean is an oilseed with numerous consumption purposes, such as oil, milk, cheese, among others, becoming one of the main foodstuffs for Brazilian families as it is directly interconnected with the country's economy, this oilseed is extremely rich in protein, serving also for the elaboration of bran and animal feed. However, the expansion of this grain crop in Brazil has led to the increase of several pests, especially the brown stink bug, Euschistus heros F. This insect poses risks to crops as it affects the crop at various stages of development, mainly compromising the formation of pods, which causes losses of up to 30% in the productive capacity or even in the progress of the seeds. From this issue, the objective was: 1) to investigate the action of plant-based phytoinsecticides from the Piperaceae family as a possible alternative for the control of the brown bug; The bioassays were carried out in the laboratories of the Center for Agro-Environmental Research, Studies and Development (CPEDA) of the State University of Mato Grosso (UNEMAT), Professor Eugênio Carlos Stieler University Campus, and chromatography was carried out at the Natural Products and Ecology Laboratory Chemistry (LAPNEQ) of the Federal University of Paraná (UFPR). In the experiments, essential oils obtained from the leaves of three species of Piperaceae (Piper hispidum Sw., Piper marginatum L. and Piper aff. divaricatum G. Mey.) were tested. The leaves were dried in a forced air ow oven at 40 °C and ground until reaching low granulometry. The plant material obtained was extracted by hydrodistillation and water vapor dragging using the Clevenger apparatus for four hours. For the insecticide bioassays, eggs of the stink bug E. heros from farms established in the laboratory were used. Five different concentrations of essential oils of the three species of Piper (0.25%, 0.5%, 1.0%, 2.0% and 4.0%) and two control treatments, one with water and the other only, were tested. with acetone solvent, on pest eggs. All tests were kept in a BOD air-conditioned chamber at 25 ± 1°C, 14 hours photophase and 70% RH. It was observed that the three species studied showed insecticidal effects on brown stink bug eggs and lethal effect on hatched nymphs. Piper marginatum stood out among the plants studied, as it caused high inviability of pest eggs. 2) The second chapter evaluated the phytoinsecticide effect of essential oils from three species of the Piperacea family, on immature T. podisi. Bioassays were carried out before and after parasitism, with seven treatments and 10 repetitions each, in a completely randomized design. The treatments were two controls (distilled water T1 and acetone T2) and five different concentrations of essential oils of each species of Piper (0.25%T3, 0.5%T4, 1.0%T5, 2.0%T6 and 4.0%T7). It can be seen that the pre-parasitism experiment resulted in less emergence of parasitoids, compared to controls, as well as influenced the sex ratio; Unlike the post-parasitism experiment, with the exception of treatments T6 and T7 in which no parasitoid emergence was verified, for the three species of Piper surveyed, there was a decrease in the birth of T. podisi, however it did not affect the sex ratio. Presenting itself as a promising alternative as a low environmental impact phytoinsecticide.

MEMBROS DA BANCA:
Presidente - 136121002 - ALESSANDRA REGINA BUTNARIU
Interno - 101366004 - MONICA JOSENE BARBOSA PEREIRA
Externo à Instituição - MICHELE TROMBIN DE SOUZA - UFPel