| Species | Provider | Further information | Invasive | Status | |
|---|---|---|---|---|---|
| Xanthomonas citri |
 |
Invasive Species Compendium (ISC) | http://www.cabi.org/isc/datasheet/56921 | Unspecified | |
| Xyleborus perforans |
|
Invasive Species Compendium (ISC) | http://www.cabi.org/isc/datasheet/57169 | Unspecified | Alien - introduced |
| Xylosandrus compactus |
|
Invasive Species Compendium (ISC) | http://www.cabi.org/isc/datasheet/57234 | Unspecified | Alien - introduced |
| Xylosandrus crassiusculus |
|
Invasive Species Compendium (ISC) | http://www.cabi.org/isc/datasheet/57235 | Unspecified | |
| Xylosandrus morigerus |
|
Invasive Species Compendium (ISC) | http://www.cabi.org/isc/datasheet/57238 | Unspecified |