Ulmus americana | Ulmus parvifolia | Ulmus minor | Ulmus mexicana | ''Ulmus davidiana'' var. ''japonica'' | Ulmus 'Sapporo Autumn Gold' | Ulmus procera | Ulmus microcarpa | Ulmus × hollandica | Ulmus 'Hoersholmiensis' | Ulmus 'Commelin' | Ulmus americana 'Patmore' |
It was first isolated around breeding galleries of scolytid beetles in the bark of Ulmus wallichiana.