Observations on damage of Hylobius abietis L. species in O.S. Topliţa, D.S. Harghita, plantations
Abstract
Young spruce crops, usually up to 5 years, from crop plantations or natural regeneration, may be damaged by Hilobius abietis L. seedlings shows fray of crust which may extend to their peak. Survey of this pest was done from April to September. All surfaces under 4 years, from instalation, created in newly deforested areas were controlled. In these places, with increasing air temperature and its stabilization over 100C, when bugs have left the wintering sites, were installed 20-30 toxic spruce bark-traps/ha, fresh with slime, size: 30x30 cm, tratated with sinoratox 5G, on the slime side and placed with this side down, above them is placing a stone or turf to keep them stretched - uniformly distributed on the surface, beetles found at each 20-30 traps, as well as each 50 seedling, were counted, calculating the average number of bugs per 100 seedlings. Table 1 shows surfaces attacked by Hylobius in period 2004-2008. Note that the largest area was infected in 2008.
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