Bionomics of Scolytus intricatus in Serbia [Serbia&Montenegro]
2001
Markovic, C. (Belgrade University, Belgrade (Serbia and Montenegro). Faculty of Forestry) | Stojanovic, A. (Natural History Museum, Belgrade (Serbia and Montenegro))
Scolytus intricatus is a secondary species present in oak forests throughout Serbia (Serbia&Montenegro). It is identified on Quercus cerris, Quercus trojana, Quercus frainetto, Quercus petraea, Quercus daleschampii, Quercus pubescens, Quercus virgiliana, Quercus robur, Quercus rubra and Fagus moesiaca. In the insectarium it has been also reared on Quercus coccifera, Castanea sativa and Corylus colurna. It develops on the material of smaller diameters (1-10 cm), although it can infest also the trunks of older trees (25-30 cm). It has got two generations. The commence of the flight of the second, overwintering generation in the field is in mid April, early May and flight duration is till mid August. The adults of the first, summer generation, emerge in mid July and their flight lasts till late September or early October. However, in mountainous regions Scolytus intricatus has got only one generation. Under such conditions, they begin and keep swarming from mid May till mid August. The adults of both sexes start flying simultaneously of equal intensity in the course of swarming. Sex index is 0.5. The insect overwinters in different larval instars. Since the age differences if overwintering larvae are great, there are no specific limits in the time when the adults of the first and the second generations are about to emerge. Consequently under field conditions, all larval instars are represented over the vegetative period, from April to October. However, only larvae are present in winter. The winter interruption of larval development is conditioned solely by low temperatures.
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