Feeding of adult Japanese beetles on spur- and long-shoot leaves of birch taxa in subg. Neurobetula.
| Plant identity | Amount of tissue eaten (cm2) | % of leaf tissue eaten | ||
|---|---|---|---|---|
| Spur | Long | Spur | Long | |
| B. utilis var. jacquemontii (trade clone) | 13.2 | 12.8 | 70.6 | 62.8 |
| B. davurica (BJG-I2I) | 6.19 | 5.10 | 62.2 | 49.8 |
| B. utilis var. jacquemontii ‘Jermyns’ | 10.4 | 10.2 | 32.4 | 35.1 |
| B. nigra ‘Heritage’ | 13.4 | 2.9 | 52.2 | 10.8 |
| B. nigra | 0.8 | 1.1 | 61.9 | 4.6 |