RESEARCHES REGARDING THE BIOLOGY OF THE PEST PITYOGENES CHALCOGRAPHUS L. (COLEOPTERA, SCOLYTIDAE) IN THE NĂDRAG - PADEŞ AREA (TIMIŞ COUNTY) PUBLISHEDCiprian George Fora, Karl Fritz Lauer, Snejana Damianov
To establish the flight phenology of the insect Pityogenes chalcographus L. and the development of descendence on the year 205, were been delimited experimental points in representative forest stands with spruce from Nădrag-Padeş area. After recorded captures at pheromonal traps baited with aggregative synthetic pheromones we establish that the insect has two flights on year. The first flight is in April, May and June (76-94% from the flight on all growing season), and the second flight is in July and August (6-24% from the flight on all growing season). Has been established the length of each flight and the top of flight. Has been established the populations level. After periodically bark the trap stakes, as favourable place of oviposition, has been established the date of first entering of parents beetles, the date of appearance of first eggs, the length of egg, larval, pupal stadium, the date of appearance of first young adults and first mature adults, in forest stands al different altitude. Has been established that the insect have two generation on year.
Pityogenes chalcographus; biology; Nădrag-Padeş