Impacto de tiametoxam + lambda-cialotrina e Beauveria bassiana sobre populações de formigas predadoras e da broca-da-cana, Diatraea saccharalis (Lepidoptera: Crambidae), em cana-de-açúcar
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Medientyp:
E-Book
Titel:
Impacto de tiametoxam + lambda-cialotrina e Beauveria bassiana sobre populações de formigas predadoras e da broca-da-cana, Diatraea saccharalis (Lepidoptera: Crambidae), em cana-de-açúcar
Erschienen:
[Erscheinungsort nicht ermittelbar]: [Verlag nicht ermittelbar], 2021
Sprache:
Portugiesisch
Identifikator:
Entstehung:
Hochschulschrift:
Dissertation, 2021
Anmerkungen:
Beschreibung:
Predatory ants, play an important role for the functioning of ecosystems as they provide several essential ecosystem services. In their role as natural enemy of many pest insects, they positively impact agroecosystems. In Brazilian sugarcane plantations these ant species are the main predators of eggs and initial instar larvae of the sugarcane borer, Diatraea saccharalis (Lepidoptera: Crambidae), one of the key pests of this crop. Thus, the conservation of the predaceous ant fauna turns out to be a desirable, but at the same time challenging task. In this highly anthropized environment, ant populations are continuously impacted by the widespread application of insecticides used to control D. saccharalis and other sugarcane pests. Further, entomopathogenic fungi are used within integrated pest management and Beauveria bassiana has proven to be efficient in controlling D. saccharalis. However, a variety of previous studies showed, that the control of pest ants, using fungal entomopathogens, did not lead to satisfactory results. Thus, the use of B. bassiana could be an interesting and sustainable alternative to control D. saccharalis as this control strategy seems to preserve the ants. In this context, the purpose of the following study was to evaluate the impact on D. saccharalis and predatory ant populations after exposure to thiamethoxan + lambda-cialotrina, a systemic insecticide, or to B. bassiana, an entomopathogenic fungus. The experiment was conducted under field conditions in two different commercial sugarcane plantations located in the state of São Paulo, Brazil. The total experimental area of 2.500 m2 was divided into three equal plots, two treatment and one control area. The exposure of the insect populations to the treatments occurred by terrestrial pulverization, applying the product with the jet directed to the base of the plant (70% base / 30% soil), using thiamethoxan + lambda-cialotrina (141 / 106 g L-1) or B. bassiana (1 x 1011 conidia mL-1) as a suspension with 150 or 200 L of water, ...