|Double-entry volume tables for Silver Fir in Gorski Kotar region. PDF EN||345|
|The effect of blue-stain on the techncal properties of wood. PDF EN||357|
|Pygaera anastomosis L. — a new insect pest on Poplars. PDF EN||369|
|Summary: In the last 7 years there have occured in our country several mass outbreaks of the Poplar Moth (Pygaera anastomosis L., Notodontidae, Lepidoptera). The strongest attack as to area and intensity took place on the 163 ha Poplar plantation "Vijuš" near Sl. Brod. As this species represents a new insect pest on Poplars the author presents a few more important data from its biology on the basis of his own investigations.|
Pygaera anastomosis L. produces in a year or partially 4 generations. The caterpillars of the second and third developmental stages hibernate in bark shakes on the stem similarly as the Stilpnotia salicis L. does. For the first time in the year caterpillars emerge in April and butterflies in May. In September a part of the caterpillars start their spinning in order to overwinter while the other continue with their development and produce another generation. The caterpillars of this generation spin in October similarly as those of the preceding generation, and hibernate. On an everage the female lays 500-600 eggs and sometimes even over 1.000.
Rearing in the laboratory showed that the feeding with the Euramerican Poplar varieties is more satisfactory than with the native Poplar species. Taking into consideration the ever larger areas under cultivation with the Euramerican varieties it can be expected that the importance of this insect pest will yet increase in the future.
|Some diriections for the cultivation of forest tree species in plantations. PDF EN||371|
|Successful sowing by hand of the Austrian Pine in the Karst region. PDF||379|
|Douglas Fir (Pseudotsuga Douglasii Carr.) as one of the species constituting the productive stands in the degraded part of the Karst region. PDF EN||383|