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The Serra Gaúcha is considered the third peach production hub in the country. Recently, a quarantine pest was found in Rio Grande do Sul state, the Drosophila suzukii. It’s a polyphagous plague, with reduced body size and it lays its eggs in healthy and intact fruits. The aim was to monitore Drosophila suzukii in peach fruits. The monitoring of D. suzukii was realized in two different cultivar areas, one of Premier and other one of Chimarrita, in 2014 and 2015 harvests, in the city of Cotiporã, RS. A fly trap was installed in each area with apple vinegar as attractive food. It was weekly checked, in order to establish the plague population fluctuation. The collected insects were taken to the Entomology Laboratory of Federal Institute of Education, Science and Technology of Bento Gonçalves, where were identified. The 1 Instituto Federal de Educação, Ciência e Tecnologia – IFRS, Câmpus Bento Gonçalves – Brasil. E-mail: alexbortoncello@gmail.com 2 Idem. E-mail: fabi_foppa@hotmail.com 3 Idem. E-mail: regina.borba@bento.ifrs.edu.br 865 Revista Thema v.16 n.4 2019 population fluctuation and sexual ratio of D. suzukii were stipulated. The presence of the species was verified in both areas and the two years. The occurrence of the pest in the 2014 was lower than in the 2015 harvest. With this pest occurrence, more experiments must be realized in order to find out if peach fruit can be a potential host of D. suzukii.

Ocorrência de Drosophila suzukii (Matsumura, 1931) (Diptera: Drosophilidae) em pêssego