Banca de DEFESA: VICTOR HUGO MAGALHÃES DE AMORIM

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : VICTOR HUGO MAGALHÃES DE AMORIM
DATA : 15/12/2023
HORA: 13:30
LOCAL: meet.google.com/mqk-yttb-vah
TÍTULO:
PALAVRAS-CHAVES:

Pesticides, Selectivity, Biological Control, Piper hispidum, Piper fuligineum.

PÁGINAS: 55
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Fitossanidade
ESPECIALIDADE: Entomologia Agrícola
RESUMO:

The use of chemical inputs for pest control is very common due to their efficiency and faster results. However, their indiscriminate use causes environmental and human health damage, as well as the development of resistance by pest insects. In field conditions, what often helps maintain the balance of these insects is the presence of natural enemies, such as the egg parasitoid Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae). However, the primary limiting factor for the parasitoid's performance is the use of non-selective insecticides, even those of biological origin, such as essential oils from plants with insecticidal properties.Seeking to assess the compatibility of using essential oils and commercial insecticides with the parasitoid's activity in agricultural systems, this study investigated the effects of two commercial products and two essential oils on adults and immature stages of T. pretiosum through laboratory bioassays. The tested commercial products were Prêmio® SC and Exalt® SC, and the essential oils were from Piper fuligineum and Piper hispidum at concentrations of 0.25%, 0.5%, 1%, 2%, and 4%, with each representing a treatment in addition to water and acetone P.A. controls. The essential oils were obtained through the hydrodistillation technique using 300 grams of fresh leaves cut into strips of approximately 1 cm and 1 liter of distilled water each for 4 hours. The tests were conducted in three bioassays.The first bioassay was carried out in glass Petri dishes, with a total of 4 dishes per treatment. The bottom of each Petri dish was sprayed according to the treatment using an airbrush adapted at a distance of 10 cm from the dish, always using the second spray. The sterile lids of the dishes received a streak of honey for feeding the adult parasitoids. In each dish, 30 adult parasitoids were released, 24 hours old. In this bioassay, the number of dead individuals was evaluated.The second bioassay was conducted in test tubes, with a total of 10 tubes per treatment. Each tube received 20 sterile eggs of Ephestia kuehniella (Lepidoptera: Pyralidae) glued to sky-blue cards with a gum arabic-based solution and previously sprayed. Then, each tube received two female parasitoids, which remained for 24 hours. Each tube was sealed with PVC plastic wrap and stored in a B.O.D. incubator for 10 days until the parasitoids emerged. In this bioassay, the number of parasitized eggs and the emerged parasitoids by sex were evaluated.The third bioassay was conducted similarly; however, the product spraying was done after offering the eggs to the female parasitoids for 24 hours. Based on the conducted bioassays, only Prêmio® is selective for T. pretiosum. The other tested products are incompatible with the parasitoid because they are highly toxic to the adults, inhibit parasitism, and the emergence of the parasitoids under the conditions of this study.

MEMBROS DA BANCA:
Presidente - 136121002 - ALESSANDRA REGINA BUTNARIU
Externo ao Programa - 110194008 - DIONES KRINSKI
Externo à Instituição - 369.259.218-37 - MICHELE TROMBIN DE SOUZA - UFPel