Levantamento populacional de Scolytidae (Coleoptera) em povoamento de Acácia-negra (Acacia mearnsii de Wild)

Abstract

This work was developed objectifying the quali-quantitative analysis, the population fluctuation, the faunistic analysis and the correlation of the species of Scolytidae (Coleoptera) with the main meteorological elements in a stand of Acacia mearnsii with four years of age. The stand was located in the Farm Menezes, country of Butiá, Rio Grande do Sul, and was of property of the company AGROSETA S.A. It was placed 35 ethanolic flight intercept traps distributed inside of the stand. The collections had occurred during the period of November 2003 until October 2004 and being made between ten up to fifteen days of interval each one, totalizing 26 collections. For the analysis of the data, the frequency, dominance, constancy and abundance indexes were calculated. The capture of the insects was correlated with the precipitation, temperature and relative humidity of air. It was collected 13.812 individuals distributed in 37 species of Scolytidae. The species most frequent, dominant, constant and abundant were Hypothenemus seriatus Eichhoff 1872, Hypothenemus eruditus Eichhoff, 1868, Xyleborinus saxeseni (Ratzeburg, 1837) and Xylosandrus retusus (Eichhoff, 1868), representing 86,89% of the frequency of captured individuals. The species of the gender Hypothenemus were the most captured, being equivalent 59,71% of the total of Scolytidae. The total of Scolytidae demonstrated positive correlation with the relative humidity of air. H. seriatus, A. obliquus and X. ferrugineus demonstrated positive correlation with the temperature. The species Xyleborinus gracilis and A. obliquus demonstrated negative correlation with the precipitation.