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Báo cáo lâm nghiệp: "Changes in the abundance of Melolontha hippocastani"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Changes in the abundance of Melolontha hippocastani . | JOURNAL OF FOREST SCIENCE 56 2010 9 417-428 Changes in the abundance of Melolontha hippocastani Fabr. and Melolontha melolontha L. Coleoptera Scarabeidae in the Czech Republic in the period 2003-2009 M.SvESTKA Forestry and Game Management Research Institute Strnady Jiloviste Czech Republic ABSTRACT In the period between 2003 and 2009 we evaluated the abundance of adults of Melolontha hippocastani Fabr. and Melolontha melolontha L. cockchafers in four forest regions of the Czech Republic. During this period each of the evaluated localities was hit twice by heavy swarming. The course of swarming species composition abundance of the respective tribe sex ratio during swarming and the correlation between the course of swarming and average daily temperature were monitored by means of a light trap an automatic meteorological station and observations in the open space the data were represented in the form of graphs. We evaluated how the trend of the abundance of the particular species developed in the respective localities in order to work out a more specific prediction of the occurrence of the cockchafer in subsequent years and the extent of damage caused by the grubs to forest plantations. Research will continue in 2010-2011. Keywords abundance light trap Melolontha hippocastani Fabr. Melolontha melolontha L. sex ratio Three species of the genus Melolontha Fabr. occur in the Czech Republic but only two species Melolontha melolontha L. and Melolontha hippo-castani Fabr. are of economic importance for agriculture and forestry. Of the greatest importance for forestry is the species M. hippocastani Fabr. which is widespread in several forest areas in warm locations on sandy soil. Mass outbreaks of the species M. melolontha L. on forest soil occur to a limited extent only. The third species Melolontha pectora-lis Germ. appears sporadically and is not economically important. The species M. hippocastani Fabr. occurs in the forest and forest-steppe regions of Russia from the .