Obolodiplosis robiniae
Black locust gall midge
Insects
Oligonychus ununguis
Spruce spider mite
Mites
Oligoporus ptychogaster
Fungus Oligoporus ptychogaster
Fungi
Operopthera brumata
Winter moth
Insects
Ophiostoma novo-ulmi
Dutch elm disease
Fungi
Ophiostoma piceae
Ophiostoma piceae
Fungi
Orgyia antiqua
Rusty tussock moth
Insects
Orthosia cerasi
Common quaker
Insects
Orthosia cruda
Small quaker
Insects
Orthosia miniosa
Orthosia miniosa
Insects
Orthotomicus longicollis
Bark beetle Orthotomicus longicollis
Insects
Orthotomicus suturalis
Bark beetle Orthotomicu suturalis
Insects
Total: 14