Os escolitíneos contribuem no processo de decomposição de árvores caidas ou recém-abatidas e podem ser potencialmente prejudiciais em ambientes florestais, sejam estes naturais ou plantados. Assim, este trabalho teve por objetivo avaliar uma assembleia de Escolitíneos (Curculionidae: Scolytinae) em um plantio de Eucalyptus urograndis na Amazônia Meridional, no município de Alta Floresta, no período de agosto de 2015 a agosto de 2016. Foram utilizadas 12 armadilhas de impacto iscadas com etanol, sendo realizadas coletas quinzenalmente. Os insetos coletados foram encaminhados ao Laboratório da UNEMAT, para realização da triagem, sendo enviados para a Universidade Federal do Paraná, para correta identificação das espécies amostradas. Foram coletados 1.248 indivíduos, com um total de 13 espécies em seis gêneros, com maior representatividade: Cryptocarenus, Hypothenemus e Xyleborus. Na análise faunística Criptocarenus diadematus Eggers, Criptocarenus heveae (Hagedorni) e Criptocarenus seriatus Eggers ocorreram como dominantes, muito abundantes, muito frequentes e constantes, com distribuição agregada, podendo ser considerados potenciais insetos-praga em florestas plantadas na região.
Bark beetles (Curculionidae: Scolytinae) are wood borers with the potential to cause significant damage in forest plantations. Studies of this group are more common in plantations of Eucalyptus, and Pinus, but the increase of planting with other forest species, such as Brazil nut and rubber trees, indicates the need for monitoring of Scolytinae in these additional forest areas. Thus, the objective of this work was to evaluate an assemblage and the main species of bark beetles in a mixed plantation of Brazil nut trees (Bertholletia excelsa Bonpl.) and rubber trees (Hevea brasiliensis (Willd. ex A.Juss.) Müll.Arg.) in Southern Amazonia. Twelve ethanol traps were used and collections were carried out biweekly for one year. The collections were evaluated descriptively way with entomofaunistic analysis, and population fluctuation and its dispersion were determined. A total of 2,738 individuals were collected, with a total of 17 species distributed in nine genera, of which Cryptocarenus Eggers 1937 and Xyleborus Eichoff 1864 showed the greatest representation. Cryptocarenus diadematus Eggers, Cryptocarenus heveae (Hagedorni), Cryptocarenus seriatus Eggers, Xyleborus affinis Eichhoff, and Xyleborus spinulosus Blandford were categorized as dominant, very abundant, very frequent, and constant. The assemblage of Scolytinae in the Brazil nut tree and rubber tree mixed plantation had a greater abundance in the rainy season, with the highest averages and population peaks. The species with the greatest representation also presented a greater number of individuals in the rainy season with aggregate dispersion.
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