Abundance and sex ratio of pine weevils, Hylobius abietis and H. pinastri (coleoptera: curculionidae) in pine clear-cuttings of different ages
2000
Sibul, I. (Estonian Agricultural Univ., Tartu (Estonia). Dept. of Silviculture)
The present study on the number and sex ratio of H. abietis and H. pinastri in conifer clear-cut areas of different age showed that the number of H. abietis exceeds considerably the number of H. pinastri both in fresh and older clear-cuttings. However, in clear-cut areas of different age, there were no major differences regarding the gender structure of various species. In all clear-cut areas, female beetles were dominating from spring to mid-summer. During the second part of summer, male beetles were predominant in clear-cut areas
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