Compatibilidade de óleos essenciais a Beauveria bassiana (Balls.) Vuill

Abstract

Insect pests are a major concern for agriculture, as they can cause productivity losses. The use of pesticides has been the main means of pest control. Despite its significant contribution to agriculture, its indiscriminate use is harmful to the environment. Awareness of the risks of agrochemicals or the use of natural enemies such as fungi, and alternative controls, such as essential ingredients, can be an alternative control. The objective of this work is to evaluate the fungicidal activity of the essential oils of Cymbopogon citratus, Cinnamomum camphora var. linaloolifera and Thymus vulgaris on the entomopathogen Beauveria bassiana. In the evaluation, tests will be controlled in a completely randomized design in a 3x6 factorial scheme, in which factor A will be constituted by the essential oils: C. camphora, C. citratus and T. vulgaris and factor B by four concentrations of essential oils: 0.5 ; 1.0; 1.5 and 2.0% v/v and 2 controls: water and water + Tween-80® (0.5% v/v). Treatments were grown in 100 mL of PDA fondant culture medium. After solidification of the culture medium, a disc of the B. bassiana colony was deposited in the Petri dish. Estimates occurred on the 3rd, 7th, and 14th day. Each treatment has 5 repetitions, each repetition being a plate. When evaluating the compatibility with the entomopathogenic fungus, it was verified that the essential oils of ,presented fungicidal activity in all concentrations collected for this non-target organism. [resumo fornecido pelo autor]