The OISC elves have been busy! See below for what we've been up to since October.  
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A beautiful waterfall in the windward Ko'olau Range seen on an aerial survey.

OISC Report 
October 1 - December 15 2016 

Rapid ʿŌhia Death: OISC has been responding to reports from the public of dead ʿōhiʿa trees and sampling them for further testing. So far, all samples submitted from Oʿahu have been negative. This quarter, samples were taken from a wildland setting in Kahana watershed and two residences: one in Kalihi and one in Kāneʿohe. The crew responded to a report of dead trees in ʿAiea watershed, but could not safely take a sample. The rest of the ʿōhiʿa trees in that area all looked healthy, so the crew did not take any samples. However, the area will be included on regular early detection surveys. Please report dead trees to OISC, we will take a sample and have it tested for the fungal pathogen that causes ROD. For more information about ROD, please visit the
Miconia calvescens: A total of 694 acres were surveyed by air and 910 acres surveyed by ground. No mature trees were found, but the crew did see an immature tree on an aerial survey over upper Waiawa watershed. This is a new watershed where miconia had not previously been detected. The closest mature tree is approximately 1,550 meters away on the other side of the Koʿolau summit in the Kaʿalaea watershed.
OISC will treat this plant and conduct further surveys as soon as possible in January. (there are currently restrictions on helicopter use due to President Obama’s visit). Kudos to the sharp-eyed field crew who saw the plant even though it was partially hidden by the canopy (see photo below). Elsewhere on the island, OISC removed 3 immature miconia from Kalihi valley, 7 immature from Mānoa and 12 immature from Nuʿuanu.
OISC places an 800-meter buffer around all mature plants that is surveyed on foot if the terrain is accessible. This equals approximately 200 acres. Another 800 meters (approximately 1,570 acres) out from there is surveyed by helicopter because on a per-acre basis it is less expensive to survey from the air, although smaller trees may be missed. Areas within the ground buffer that are too steep to survey on foot are also flown by helicopter. Immature trees are buffered at 500 meters. This tree was within the predicted dispersal distance of 1600 meters, although according to OISC’s data only 1% of immature trees are found more than 400 meters away from a mature tree. We want to find 100% of all the trees, ideally before they set seed, so that 1% is still important!
Dr. Shady can't hide! The field crew was able to spot this immature miconia plant from a helicopter even though it is hiding under the canopy. 
Devil weed (Chromolaena odorata): The crew surveyed 1,120 acres by ground removing 91 mature and 1,562 immature plants. In addition, after several cancellations due to bad weather, OISC was finally able to conduct an aerial treatment of an isolated devil weed infestation in Kahana Valley. Many, many thanks to the Hawaiʿi State Division of Parks for their patience and flexibility.
Cape ivy (Delairea odorata): 52 immature plants removed from Kaloʿi Watershed.
Himalayan blackberry (Rubus discolor): 11 acres surveyed and 15 plants removed from the Pālolo Watershed.
Coqui frog (Eleutherodactylus coqui): Worked with HDOA to conduct sprays at 2 sites where there were more coqui frogs than could be hand captured. Both sites are now quiet but monitoring will continue. If you think you hear a coqui frog please report it to OISC at or 808-266-7994. If possible, please record what you are hearing and e-mail it to us.
Cane ti (Tibouchina herbacea): The crew conducted surveys in ʿAiea in response to 2 immature plants found by OISC partners in that watershed and in Poamoho where the main infestation occurs. No Tibouchina was found in ʿAiea, but the crew found another hotspot that they could not reach on foot in Poamoho. Eleven mature plants and 169 immature plants were removed from the core in Poamoho.
Regular early detection surveys for little fire ant, coconut rhinoceros beetle and naio thrips found none.
  • Reached 617 people through events, including the Landscape Industry Council of Hawaiʿi conference, the Hawaiʿi Farm Bureau Conference, Windward Hoʿolaulea, a Halloween event at Sea Life Park and the Honolulu Zoo Children’s Discovery Forest Work Day.
  • Participated in a UH College of Education event held at the Waikīkī Aquarium to introduce faculty to place-based science activities. OISC presented the little fire ant survey activity.
  • OISC presented the movie “Fire! Little Fire Ants in Hawaii”, at three different venues,
  • Presented to an ʿAiea Boy Scout troop and the Mānoa Neighborhood Board.
  • Presented little fire ant activity in five schools.
  • Helped to lead a teacher’s inservice day for Kamehameha Schools.
  • 7 volunteers helped remove Ardisia virens, Stromanthe tonckat and Miconia calvescens from Mānoa. (The survey was only for the first two species, but the volunteers found five miconia plants during the survey. Three of them were over 10 feet tall!
OISC is 15 years old this year! We would like to thank all who have supported our mission to protect Oʿahu from invasive species over the years.  Mahalo to our volunteers, partners, funders, the landowners that let us survey their land and citizens that keep a look (and a listen) out for our target species. We wouldn't have made it this far without you! Mele Kalikimaka and Hauʿoli Makahiki Hou!

( Photo:ʿŌhiʿa blooming in the Koʿolau by Lara Reynolds)
Copyright © 2016 Oahu Invasive Species Committee, All rights reserved.

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