Report to the Republic of Palau: 2008 update on Invasive Plant ...

<strong>Report</strong> <strong>to</strong> <strong>the</strong> <strong>Republic</strong> <strong>of</strong> <strong>Palau</strong>: <strong>2008</strong> <strong>update</strong> on Invasive Plant
Species
Table <strong>of</strong> Contents
1. Significant new species found in this survey ................................................................................................................ 3
Widespread .................................................................................................................................................................... 3
Babeldaob ...................................................................................................................................................................... 3
Koror State ..................................................................................................................................................................... 6
Koror .......................................................................................................................................................................... 6
Ngerkebesang ............................................................................................................................................................. 6
Rock Islands ............................................................................................................................................................... 7
Peleliu State ................................................................................................................................................................... 8
Peleliu ........................................................................................................................................................................ 8
Ngercheu (Carp Resort) ............................................................................................................................................. 8
Kayangel ........................................................................................................................................................................ 8
2. Species that are subjects <strong>of</strong> eradication programs ......................................................................................................... 9
3. Major species that are invasive or have <strong>the</strong> potential <strong>to</strong> become so in <strong>Palau</strong> ................................................................ 9
Invasive species already widespread in <strong>Palau</strong> .............................................................................................................. 10
Invasive species <strong>of</strong> limited extent ................................................................................................................................ 13
4. O<strong>the</strong>r species <strong>of</strong> concern that are known <strong>to</strong> be weedy or invasive elsewhere and are common, weedy or cultivated in
<strong>Palau</strong> ................................................................................................................................................................................ 18
5. Native species (or Micronesian introductions) exhibiting aggressive behavior .......................................................... 21
6. Invasive plant species not known <strong>to</strong> be in <strong>Palau</strong> ......................................................................................................... 22
Invasive plants associated with <strong>the</strong> Compact Road ......................................................................................................... 26
General observations and recommendations .................................................................................................................... 27
Species-specific recommendations .................................................................................................................................. 31
Table A. Priority species for exclusion from <strong>Palau</strong> .................................................................................................... 31
Table B. Cultivated species <strong>of</strong> possible threat <strong>to</strong> <strong>Palau</strong> .............................................................................................. 33
Table C. Critical species that should be subject <strong>to</strong> inter-island quarantine ................................................................. 35
Table D. Summary <strong>of</strong> major invasive species present in <strong>Palau</strong> with recommendations for <strong>the</strong>ir management .......... 37
Recommendations by State .............................................................................................................................................. 48
All states ...................................................................................................................................................................... 48
Kayangel State ............................................................................................................................................................. 49
Babeldaob States .......................................................................................................................................................... 49
Aimeliik State .......................................................................................................................................................... 49
Airai State ................................................................................................................................................................ 50
Melekeok State ........................................................................................................................................................ 50
Ngaraard State .......................................................................................................................................................... 50
Ngarchelong State .................................................................................................................................................... 50
Ngatpang State ......................................................................................................................................................... 51
Ngeremlengui State .................................................................................................................................................. 51
Ngiwal State ............................................................................................................................................................. 51
Koror State ................................................................................................................................................................... 51
Koror, Malakal and Ngerkebesang .......................................................................................................................... 51
Rock Islands ............................................................................................................................................................. 51
Peleliu and Angaur ....................................................................................................................................................... 52
Peleliu State ................................................................................................................................................................. 52
Peleliu ...................................................................................................................................................................... 52
Ngercheu (Carp Resort) ........................................................................................................................................... 53
Angaur State ................................................................................................................................................................ 53
Southwest Islands ........................................................................................................................................................ 53
Sonsorol State .............................................................................................................................................................. 53
Sonsorol ................................................................................................................................................................... 53
i