Numbers of the 23 Non-native Tree Species Reported and the Insect and Fungus Threats to Them
| Country | Trees | Fungi | Insects |
|---|---|---|---|
| Bulgaria | 9 | 14 | 16 |
| Great Britain | 18 | 290 | 120 |
| Slovakia | 15 | 28 | 53 |
Elisabeth Pötzelsberger and colleagues gathered data on 23 non-native tree species grown in Europe. They analyzed reports from Slovakia, Great Britain, and Bulgaria about the number of these species grown in those countries as well as the numbers of insect and fungus species that damage those trees. The researchers concluded that only one of the three countries had a greater number of damaging fungus species than damaging insect species.