Feeding of adult Japanese beetles on spur- and long-shoot leaves of Betula maximowicziana, B. papyrifera, and hybrids involving these species.
| Plant identity | Amount of tissue eaten (cm2) | % of leaf tissue eaten | ||
|---|---|---|---|---|
| Spur | Long | Spur | Long | |
| B. maximowicziana (MA 79-081-F) | 2.21 | 0.52 | 5.3 | 1.4 |
| B. maximowicziana × B. papyrifera-F1 (F-436) | 9.31 | 4.61 | 23.4 | 13.4 |
| B. maximowicziana × B. papyrifera-F2 (MA 79-080-B) | 10.98 | 8.30 | 33.9 | 25.6 |
| B. papyrifera | ||||
| NST-389(25-7) | 9.82 | 10.63 | 37.8 | 42.4 |
| NST-386(18-6) | 8.46 | 7.15 | 34.2 | 28.6 |
| NST-381(20-4) | 0.92 | 1.00 | 3.6 | 3.6 |
| B. platyphylla var. Japonica × B. papyrifera | ||||
| NA 16574-1(F1) | 15.83 | 16.47 | 60.0 | 55.3 |
| BE-12 (F2) | 11.32 | 13.26 | 38.5 | 48.5 |