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08 - First record of Quadrastichus mendeli (Hymenoptera: Eulophidae) in Brazil: the Australian parasitoid of Blue Gum Chalcid wasp not recognize geographical barriers

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Presented at

XXV IUFRO WORLD CONGRESS

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Abstract

The Blue Gum Chalcid wasp Leptocybe invasa (Hymenoptera: Eulophidae) is considered one of the major exotic pests in Eucalyptus plantations worldwide. The biological control with parasitoids and genetic resistance are considered the most adequate methods for management of this pest. More than ten parasitoid species was found associated with L. invasa galls in Australia. The most species used in biological control programs of L. invasa are Quadrastichus mendeli Kim & La Salle and Selitrichodes neseri Kelly & La Salle (Hymenoptera: Eulophidae). The latest was imported to Brazil from South Africa in 2015 and are currently released to control this pest. Q. mendeli was recently found in unintentional introductions in Italy (2013), South Africa (2016) and Argentina (2016) and in December of 2018 where found in São Paulo state, Brazil. The aims of this work was report for the first time the presence of Q. mendeli in Brazil and to evaluate their impact in the biological control of L. invasa. Branches of Eucalyptus grandis hybrid with mature L. invasa galls were collected in a plantation in the municipality of Luís Antônio in São Paulo State, Brazil on 07/12/2018 and maintained in an acrylic cage. Together with L. invasa females emerged 30 females of a one different species from the galls. The specimens were confirmed as a Q. mendeli by morphological characteristics and by molecular analysis. Future prospects will be study the bioecology, dispersion and a possible interaction with S. neseri of this parasitoid that not recognize geographical barriers.

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