Biotic and abiotic factors causing the collapse of Robinia pseudoacacia L. veteran trees in urban environments
Fig 1
The distribution of micro- and macroelements in the black locust leaves according to location. A). The distribution of black locust pests and pathogens in the locations under study and their effect on the health of the trees—B). The influence of micro- and macroelements in black locust leaves on the distribution of diseases and pests in relation to the health of the trees—C). KP—Krakow park; PP—Poznan park; WP—Wrocław park; KS—Krakow street; PS—Poznań street; WS—Wrocław street; Aphis craccivora–A. craccivora; Appendiseta robiniae–A. robiniae; Macrosaccus robiniella–M. robiniella; Parectopa robiniella–P. robiniella; Obolodiplosis robiniae–O. robiniae; Nematus tibialis–N. tibialis; Sitona lineatus–S. lineatus; Erysiphe polygoni–E. polygoni; Pleospora robiniae–Pl. robiniae; Phylosticta robiniae–Ph. robiniae; chlorosis; Q-health quality; PotT–perimeter of tree; n–number of trees.