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ŠUMARSKI LIST 9-10/2023 str. 53     <-- 53 -->        PDF

height of 29,3 cm, compared to the 20,2 cm average height of the shaded untreated plants (Fig 8). Difference between the treated and untreated unshaded plant did not differ significantly in 2021 also.
The effect of the disturbance of the physiological processes in oaks during the insect attack was elaborated previously (Nikolić et al., 2019; Pilipović et al., 2020). Nikolić et al., (2019) recorded that the oak lace bug attack can cause decrease of net photosynthesis and stomatal conductance in oaks. Like other stressful processes that can lead to the disturbance of the productivity and water use efficiency (WUE) in oaks (Galle et al., 2010). Oak lace bug attack can lead to the increase of the use of the stored assimilated carbon for the cell respiration instead for the growth in which these losses can amount between 30% and 50% of the assimilated carbon (Ripulone et al., 2004).
Considering that the attack of the oak lace bug on unshaded oak seedlings remained in the range between 28,9% and 40,8% of damaged leaves, there was no significant decrease of average height of the investigated seedlings neither for treated nor untreated plants. Such results lead to the conclusion that there is no need for the oak lace bug suppression if the oak seedlings are developing after the final felling of the shelterwood forest regeneration system. In the case of artificial regeneration, the recommendation is to do the acorn sowing on the areas where the adult trees are