Banca de DEFESA: GABRIEL DOS SANTOS CARVALHO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : GABRIEL DOS SANTOS CARVALHO
DATA : 04/09/2020
HORA: 08:00
LOCAL: Sala de vídeo conferencia do Campus de Tangará da Serra
TÍTULO:

Natural and applied biological control: influence of native vegetation fragments and releases from Trichogramma pretiosum (Riley, 1879) in lepidoptera-pest parasitism in soybean crop

PALAVRAS-CHAVES:

Natural vegetation, adjacent habitat, lepidoptera - pest, natural biological control, applied biological control.

PÁGINAS: 89
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
SUBÁREA: Ecologia Aplicada
RESUMO:

The agricultural expansion of soy favors the appearance of pests and the reduction of areas of natural vegetation, compromising the ecosystem services provided by beneficial insects. The control of these pests occurs through insecticides, which impact human health and the environment, in addition to harming their natural enemies. In this sense, the present thesis evaluated the influence of native habitats and flooding releases of Trichogramma pretiosum (Riley) on the parasitism of soybean pest lepidopterans. Therefore, in chapter I we evaluated, in an area, whether the distance of cultivation in relation to the Cerrado fragment interferes in the richness, abundance and rate of parasitism of lepidopteran pests by Ichneumonoidea. We observed that the distance of cultivation in relation to the edge did not affect the diversity of Ichneumonoidea, abundance and rate of parasitism, but it did influence the abundance of caterpillars, with the lowest average closest to the fragment. The diversity of Ichneumonoidea was greater in the off-season and in the vegetative. The most abundant subfamilies were Ichneumoninae, Microgastrinae, Macrocentrinae and Cremastrinae. In the second chapter, we verify whether the parasitism rate and abundance of soybean pest lepidopterans were affected by the distance and amount of natural habitat, amount of pasture and total cultivated area, in different cultivation areas. We verified that the distance affected the parasitism of the caterpillars, increasing as it approaches the natural habitat; the amount of this does not interfere with the rate of parasitism, but has significant interaction with distance. The abundance of caterpillars was not affected by distance, but was benefited by the other metrics (amount of natural habitat, amount of pasture and cultivated area). In the third chapter, we evaluated the effect of different proportions of T. pretiosum (100,000; 200,000; 300,000 wasps / ha, control 1 = without release and without application; control 2 = without release and with application). All treatments with parasitoid release kept the caterpillar population below the control level, therefore, we recommend the use of 100,000 wasps / ha as it represents a lower production cost. These results are expected to contribute to subsidize the ecological management of caterpillars in soybean crops and thus reduce the risks to biodiversity.

MEMBROS DA BANCA:
Externo ao Programa - 136121002 - ALESSANDRA REGINA BUTNARIU
Externo à Instituição - BRUNO ALEXIS ZACHRISSON SALAMINA - UP
Externo ao Programa - 80797005 - CARLA GALBIATI
Externo à Instituição - MADELAINE VENZON - EPAMIG
Presidente - 101366004 - MONICA JOSENE BARBOSA PEREIRA