pear tree
| psylla
| pear tree | |
| agric. | Pyrus communis |
| biol. | Pirus montana var. rehderi Nakai |
| pear-tree | |
| agric. | Pyrus communis |
| psylla | |
| biol. | Psyllidae Chermidae; Psylla sp.; Psyllidae |
|
pear tree : 14 phrases in 4 subjects |
| Agriculture | 5 |
| Biology | 3 |
| Entomology | 3 |
| Natural sciences | 3 |