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pear rust
| mite
| pear rust | |
| biol. | Gymnosporangium haraeanum Syd. |
| mite | |
| health. nat.res. | Dermatophagoides Farinae; Dermatophagoides Pteronyssinus |
| nat.sc. agric. | Acarina; Acaridae |
| |||
| Gymnosporangium haraeanum Syd. | |||
| Gymnosporangium fuscum; Gymnosporangium sabinae | |||
| pear rust: 3 phrases in 2 subjects |
| Biology | 2 |
| Pest control | 1 |