DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 1-2/2013 str. 58 <-- 58 --> PDF |
The same trend showed the total consumption of food of caterpillars of future males of the 4th instar (T0/0.16 g, T1/0.10 g, T2/0.09 g, T3/0.09 g; p < 0.001) and the 5th instar (T0/0.47 g, T1/0.36 g, T2/0.37 g, T3/0.34 g; p=0.001–0.015) (Fig. 11), which became evident in the whole consumption of food of caterpillars of future males (T0/0.74 g, T1/0.50 g, T2/0.49 g, T3/0.47 g; p < 0.001) (Fig. 12). At caterpillars of future females, statistically significant differences in the food consumption were not noted except the 4th instar where treatment T1 (0.12 g) differed from treatment T3 (0.08 g) (p = 0.025). The total consumption of food of caterpillars of the 5th instar reached 0.24–0.30 g and of the 6th instar 1.01–1.21 g (Fig. 13). In the total consumption of food of females, significant differences were not determined among particular treatments (T0/1.51 g, T1/1.57 g, T2/1.61 g, T3/1.40 g) (Fig. 14). Caterpillars of future females showed (as expected) significantly higher total consumption of food than caterpillars of future males (1.52 and 0.54 g; p < 0.001). Discussion Rasprava Gypsy moth is a polyphagous species occurring in the majority of broadleaved species and in some conifers (Doane, McManus 1981). Although birch does not rank among the most attractive species, it was selected as a nutritive species to compare a possible response with other phytophages trophically related particularly to birch – Cabera pusaria L., Lochmaea caprea L., Phyllobius sp., Euceraphis betulae Koch (Kula et al. 2012). The content of nitrogen in leaves of deciduous species is given within the limits 10–40 mg.g–1 (Larcher 1988). Through the fertilization of birch by ammonium nitrate significantly differentiated values were achieved of the concentration of nitrogen in leaves (17.17–38.89 mg.g–1). The low content of nitrogen in food causes its increased consumption and feeding, digestion and development are |