Aloha , below please find our report for what's been going on with devil weed (Chromolaena odorata) miconia and more. 
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Always remember to look up when surveying for miconia! (Its the dark leaved plant peeking out from the behind) 

OISC Report for August and September 2016 

Miconia (Miconia calvescens): 832 ground acres surveyed and 2,041 aerial acres surveyed (some of these were dual surveys with devil weed). One mature and 59 immature found and treated in Kalihi, and 8 immature found and treated in Kaʿalaea. The Kalihi plants were found during a camping trip that required the crew to fly in and camp in Kamana iki Valley. Many thanks to the staff at the Kamehameha Schools campus who allowed us to use some of the land in back of the school as a staging area. As is evident from the number of plants found, it is critical that the area be surveyed regularly. Mahalo!

Devil weed (Chromolaena odorata): 1,089 ground acres and 1,238 aerial acres were surveyed. The crew are still finding large patches of devil weed, but the ones that have been treated have little or no recruitment. The seeds do not form a persistent seedbank like miconia. The crew also conducted a road survey of the Pearl Harbor area and Marine Corps Base Hawaiʿi for devil weed since there is an infestation at Camp Smith and there may be vehicles and people that move between these sites. No devil weed was seen.

Fountain grass (Pennisetum setaceum): 356 acres of road surveys completed along Farrington Highway and other public roads and none seen. However, the crew found a large patch of fountain grass in ʿAiea during survey for devil weed. This is the first report of this species in the mauka section of the watershed. Wind dispersed seeds sure can get around. Many thanks to OISC’s partner the Koʿolau Mountain Watershed Partnership who has offered to conduct treatment.

Cane ti (Tibouchina herbacea) Also in ʿAiea, another of OISC’s partners found an immature cane ti (Tibouchina herbacea) along the ʿAiea Ridge Trail. This species was not previously known to occur in this watershed. OISC plans to scour the trail for more plants later this month. Cane ti can disperse by wind but also on hiking boots and other gear. Please wash your boots between trails! It can really make a difference. At Poamoho, where we expect to find cane ti, the crew treated 265 immature plants.

Little fire ant and coconut rhinoceros beetle surveys found none.

Fourteen coqui frogs removed from Waimānalo.

Rapid ʿŌhiʿa Death: OISC field crew sampled dead trees reported by the public from two locations. Both tested negative. Oʿahu’s natural resource agencies met to discuss the results of the early detection surveys conducted in April and May. Dead ʿōhiʿa trees were seen in a number of different watersheds, but the work is being split according to who has staff in the watershed. Sampling trees in such remote locations will be logistically difficult and time-consuming and OISC greatly appreciates that everyone is willing to split the workload with us. A dead ʿōhiʿa tree does not necessarily mean that ROD has come to Oʿahu. Drought, physical injury and other pathogens and tree diseases might kill a weakened tree. No samples from Oʿahu have tested positive. Learn more at the newly revamped website for ROD. Check it out at: 

  • OISC staff gave presentations to 111 people. The Little Fire Ant lesson plan was presented to 59 students at two different schools.
  • OISC outreach staff conducted trail surveys to gauge awareness of Rapid ʿŌhiʿa Death among hikers at Wiliwilinui, Mānoa Falls and Nuʿuanu Judd and Kuliʿouʿou Trails and talked to 400 hikers. Results will be used to refine outreach about the disease to trail users.
  • Eleven volunteers participated in monthly volunteer trips at Lyon Arboretum.
  • OISC’s outreach specialist published an article about Little Fire Ant in Landscape Hawaiʿi magazine.
Above left: Pulling cane ti (Tibouchina herbacea) from the summit area of Poamoho. Above Right: OISC field crew member negotiating the steep windward side of the Poamoho summit to look for cane ti. 
Above left: The Poamoho summit is often misty. The crew wears Tyvek suits in the core to cut down on seed dispersal. Above right: a view of cane ti from above. 
Above: Miconia can usually be pulled out of the ground, but larger
trees take some effort. 
Above: A wedge-tail shearwater chick. Every year OISC assist Marine Corps Base Hawaii Environmental Staff with a Wedge-tail shearwater census. 
Copyright © 2016 Oahu Invasive Species Committee, All rights reserved.

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