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This research was aimed at obtaining data about earwig behavior (Marava arachidis Y.) on fennel agro-ecosystems and evaluating its potential capacity to access plants in the absence of aphids under laboratory and field conditions. This study establishes a baseline to evaluate earwigs as biological controls to combat aphids that attack fennel plants. Two experiments were developed. In experiment 1, earwigs were studied under laboratory conditions, in experiment 2 under field conditions. Independent variables were sex, exposure to the essential oil of fennel for 24 or 48 hours, and whether the fennel plant was vegetative or flowering. The results indicated that earwigs will climb a fennel plant in the absence of aphids and that few statistical significant results were obtained among the independent variables examined. A difference between male and females was noted in the field experiment in animals receiving 48 h of exposure to the essential oil of fennel. The terminal height reached by males and females in the 48 h vegetative and flower condition also differed. Este trabalho objetivou obter os primeiros dados a respeito da tesourinha (Marava arachidis Y.) em agroecossistema de erva-doce, além de avaliar sua capacidade potencial em acessar essas plantas na ausência de afídeos, em laboratório e campo, permitindo futuros trabalhos visando a seu uso no controle biológico para combater os afídeos que atacam essa cultura. Assim, dois experimentos foram realizados, sendo que no experimento 1 as tesourinhas foram estudadas em condições de laboratório e no segundo experimento em condições de campo. As variáveis independentes observadas foram: sexo, exposição a óleo essencial de erva-doce por 24 e 48 horas, em plantas no estágio vegetativo e reprodutivo. Os resultados indicaram que as tesourinhas acessam as plantas na ausência de afídeos e que existem poucas diferenças entre as variáveis estudadas. A diferença entre os machos e as fêmeas foi observada em campo quando os insetos foram expostos por 48 horas a óleo essencial de erva-doce. A altura máxima atingida pelos machos e pelas fêmeas, quando expostos ao óleo essencial de erva-doce por 48 horas nos estágios vegetativos e de florescimento, também diferiram

Capacity of earwig Marava arachidis (Yersin) to access fennel plants Foeniculum vulgare Mill in laboratory and field