| Species | Provider | Further information | Invasive | Status | |
|---|---|---|---|---|---|
| Xanthomonas axonopodis pv. phaseoli |
 |
Invasive Species Compendium (ISC) | http://www.cabi.org/isc/datasheet/56962 | Unspecified | |
| Xanthomonas fragariae |
|
Invasive Species Compendium (ISC) | http://www.cabi.org/isc/datasheet/56934 | Unspecified | |
| Xiphinema index |
|
Invasive Species Compendium (ISC) | http://www.cabi.org/isc/datasheet/57032 | Unspecified | |
| Xyleborinus saxesenii |
|
Invasive Species Compendium (ISC) | http://www.cabi.org/isc/datasheet/57038 | Unspecified | Native |
| Xyleborus dispar |
|
Invasive Species Compendium (ISC) | http://www.cabi.org/isc/datasheet/57157 | Unspecified | Native |