First report of Megastigmus brasiliensis occurrence parasitizing eucalyptus gall wasp in Rio Grande do Sul
Abstract
The eucalyptus gall wasp (Leptocybe invasa) causes severe damage to its host plants. One of the main strategies to control its dispersion is biological control with parasitoid hymenopterans. Some parasitoid species, like Megastigmus brasiliensis, may have potential in the biological control of gall wasp in the southern region of Brazil. The study aimed to report the occurrence of parasitoids associated with L. invasa as well as to gather information about its distribution in the central region of Rio Grande do Sul state. The collections were carried out in twelve cities in the central region of the state between December and March 2015-2016 and 2016-2017. Eucalyptus branches with galls were collected and kept in laboratory under controlled temperature conditions (28 ± 2°C). After two months, the collected individuals were screened and identified. In all sampled cities there was the presence of gall wasp with different levels of density, which may be related to the genetic material of host plants and the local weather conditions. The only parasitoid collected was M. brasiliensis. This work presents the first occurrence record of M. brasiliensis in Rio Grande do Sul and the second record in Brazil.
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References
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