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One of the main problems in agriculture is crop pest management, which causes financial damage to farmers. This management is traditionally performed with pesticides; however, with a large area of application, it would be more economically viable and more environmentally recommended to know precisely the regions where there is concrete infestation. In coffee farms, cicada makes a distinctive sound when it hatches after years of underground nymph-shaped living. One possibility of contributing to its management would be the development of a device capable of capturing the sound of the adult cicada in order to detect its presence and to quantify crop insects. This device would be spread across the coffee plots to capture sounds within the widest possible area coverage. With monitoring and quantification data, the manager would have more input for decision-making and could adopt the most appropriate management technique based on concrete information on population density separated by crop region. Thus, this chapter presents an algorithm based on wavelets and support vector machines (SVMs), to detect acoustic patterns in plantations, advising on the presence of cicadas.

As cigarras são uma praga-chave das lavouras de café com a característica marcante de emissão de sons. É de interesse do produtor o desenvolvimento de ferramentas para monitoramento das lavouras, buscando economia de recursos. Este trabalho realiza um levantamento bibliográfico dos trabalhos focados no monitoramento acústico de Cicadidae procurando soluções disponíveis para auxílio do produtor. Os resultados mostraram que a maioria dos trabalhos encontrados (52,3%) utiliza softwares em laboratório e apenas 4,7% utiliza algum software para monitoramento implantado em campo. Conclui-se, a partir desse dado, que essa pode ser uma importante lacuna a ser preenchida em trabalhos futuros, por meio do processamento digital de sinais de áudio em um possível dispositivo implantado em lavoura. Abstract: Cicadas are a key pest of coffee plantations with a marked sound emission characteristic. It is of interest to the producer to develop tools to monitor crops in order to save resources. This research performs a bibliographic survey of works focused on the acoustic monitoring of Cicadidae, in order to look for available solutions to help producers. The results showed that the majority of the works founded (52.3%) are related to the use of softwares in laboratory, and only 4.7% use some monitoring software implemented in the field. Therefore, that must be an important gap to be filled in future works, applying digital audio signal processing in a possible device implanted in a field. Keywords: Bioacoustics, Digital Audio Signal Processing, Monitoring.

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