DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 1-2/2017 str. 53 <-- 53 --> PDF |
started at the times when the temperature values exceed about 20 °C, referred at Vité et al. (1974). Depending on these identifications, it can be said that I. sexdentatus carried out two flights in this period, first flight starts at early may, this period continues until mid-June and lasts about 40-45 days. Also, it can be said that second flight starts around mid-June and continues until early September and lasts about 50-55 days (Figure 3). However, it is not possible to differentiate the generation numbers and times of flight periods with certain borders. With more extensive and long term studies, the status in the forests of the region may be detailed. Besides that, in a study covering two separate years carried out in the spruce forests, two generations of the beetle was reported and the dates given for two flight periods were approximately similar (Özcan et al., 2011). The findings of other studies on the number of generations of the beetle species and flight starting and ending times in Turkey (Beşceli and Ekici 1969; Serez, 1983, Sekendiz, 1984) and the findings of this study shows similarities. 68.82% of the captured beetles are recorded in the controls applied in 22-29 May and 6 June and this time period falls within the first flight period specified. The average number of I. sexdentatus captured by traps in the first and second flight periods specified are 59.36 and 9.93, respectively (Table 1) and the difference in the I. sexdentatus captured between two periods are statistically significant (p<0,05) (Table 2). |