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The O‘ahu Invasive Species Committee (OISC) works to prevent new invasive species infestations and to eradicate incipient, high-threat species before they become widespread. OISC is a voluntary partnership of private, governmental and non-profit organizations, and individuals.
The completely unexpected miconia tree found in `Aiea; there is no history that miconia was cultivated anywhere near there. 

Monthly Report for September and October 2015  

Three meter immature miconia plant found in `Aiea

Big news in ʻAiea! The OISC crew found a three meter immature miconia (Miconia calvescens) in Keaʻiwa Heiau State Park in ʻAiea on October 1 while doing surveys for another of our target species, devil weed (Chromolaena odorata). There is no historical record of miconia being planted or occurring naturally in that area and it will expand our search area by quite a bit. OISC had previously estimated the known seed bank for miconia as an 800 meter buffer around all mature trees. The ʻAiea tree is much farther than that from any known mature tree. We don’t know if there is a mature tree somewhere that we don't know about, or if this is a random long-distance dispersal event. The crew has flown a 500-meter radius of the forested area to the northeast of the plant. The other side is a residential neighborhood so it cannot be surveyed by air. The roads in the area were recently surveyed for devil weed and the crew would have noticed a miconia tree on those surveys, but they will go again just in case. So far, no other trees have been found. 478 acres were surveyed by air, 142 acres were surveyed by ground. This was the first time the OISC crew had visited this spot so this plant being “self-inflicted” through contaminated gear isn’t a possibility. Many thanks to Hawaiʻi State Parks for their cooperation in controlling both devil weed and miconia.
Please report any miconia sightings to OISC at or 808-266-7994. Please take a point, but leave the plant in place. The OISC crew will come and dispose of it. We ask people to leave the plant so we can record its height and other data, take a point and make sure that it is disposed of properly. Miconia is one of OISC’s top priorities because of its ability to replace Hawaiʿi’s diverse forests with single species miconia stands that cannot hold the soil; promoting erosion, landslides, and sedimentation of near shore reefs.

 In other watersheds, the OISC crew removed miconia from Heeia, Nuʻuanu, Mānoa, Makiki, Kawainui, Kaʻalaea, Wahiawa and Waimanalo watersheds. One mature that slightly expands our designated search area found in Nuʻuanu.
Watershed Mature Miconia Immature Miconia
ʿAiea 0 1
Kaʿalaea 0 17
Kawainui 0 8
Makiki 0 1
Mānoa 0 253
Nuʿuanu 1 0
Waimānalo 0 16
Total 1 296
Work continues on cane ti at Poamoho
OISC, together with the Natural Area Reserves Program and Ko
ʿolau Mountain Watershed Partnership, removed four mature and 1,062 immature cane ti (Tibouchina herbacea) plants from the Poamoho Natural Area Reserve. This plant is a severe problem in Maui and Big Island forests. Unlike most of our target species that are introduced in residential areas, upper Poamoho is the only place on Oʿahu this species is found. 

Aerial monitoring finds no pampas grass regrowth 
OISC crew flew 624.65 acres along the Heʿeia cliffs to monitor a 2011 treatment for pampas grass (Cortaderia spp.) and check for spread aroung the original infestation of 14 plants. They did not see any regrowth or spread. 

Devil weed containment work continues
OISC surveyed 825 acres for devil weed (Chromolaena odorata) and treated and/or removed 598 mature and 3,475 immature plants. 
Watershed Mature Devil Weed Immature Devil Weed
ʿAiea 28 87
Kahana 23 801
Paumalu 547 2587
Total 825 3475
The identifying characteristics of miconia are the striking purple undersides and the three very prominent vertical veins running down the leaf. 
OISC's big little fire ant at Tamarind square in downtown Honolulu during "Spot the Ant, Stop the Ant" month. OISC distributed 1,350 test kits during the month of September. 
Fifteen coqui frogs captured in Waimānalo
OISC conducted surveys for coqui frog in Waimānalo and Kawai Nui watersheds. Fifteen frogs were caught in Waimānalo, none in Kawai Nui.  

Early detection for invertebrate pests continues--no detections during September and October.
Surveys for Myoporum thrips (Klambothrips myopori), little fire ant (Wasmannia auropunctata) and coconut rhinoceros beetle (Orystes rhinoceros) did not detect any of these species. Data is below: 
  • 18 surveys conducted over 8 different watersheds for Myoporum thrips.
  • 78 traps checked per month for coconut rhinoceros beetle over 27 different watersheds.
  • 15 high-risk sites surveyed for little fire ant. Trail maintenance was done in preparation for six-month post-treatment monitoring survey. 
Spot the Ant, Stop the Ant month distributes 1,325 little fire ant test kits. 
If you ride TheBus, we hope you saw the "Spot the Ant, Stop the Ant" month Adwalls in addition to hearing Christy Martin of CGAPS featured on the KSSK morning show for "Spot the Ant, Stop the Ant" month. OISC outreach specialists attended five events with the OISC little fire ant costume and the education specialist gave little fire ant talks at four libraries.  Unfortunately only 35 test kits were handed in that month. Next year we will try to include more incentives to actually use the kit and return it. 

In October the outreach specialist attended the Landscape Industry of Hawaiʻi conference and participated in preparing students for the Science Olympiad. The OISC education specialist met with around 60 educators from the Hawaiʻi State Teachers Association to present the Hoʻike little fire ant curriculum and was able to distribute the curriculum to multiple schools.

Cumulatively, for both October and September, 574 people were reached through 25 events. Due to inclement weather, the OISC volunteer trip was cancelled for September, but in October volunteers pulled 33 immature Ardisia virens and 7 mature and 92 immature Stromanthe tonckat. 
Guinea grass + steep dropoffs make devil weed sweeps particularly challenging.
Miconia's large leaves stand out against other vegetation.
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The O'ahu Invasive Species Committee is a project of the Pacific Cooperative Studies Unit (PCSU) University of Hawai'i at Mānoa. 
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