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Santos, G. L., D. Kageler, D. E. Gardner, and C. P. Stone. 1986. Herbicidal control of selected alien plant species in Hawaii Volcanoes National Park: A preliminary report. Cooperative Park Studies Unit (Dept. Botany)/Univ. Hawaii. Technical Report 60:59
ABSTRACT
Herbicide tests were conducted between April 1984 and June 1986 on seven species of alien plants classified as threats to native ecosystems within Hawaii Volcanoes National Park. The study was designed to be an initial series of tests to develop effective alien plant treatment techniques and to obtain baseline information on the effects of herbicides on native flora. Highly effective treatments were found for olive (Olea europaea subsp. africana) (TORDON RTU on cut stumps) and for both species of silk oak. (Grevillea banksii and G. robusta) (2.5% GARLON 4 in diesel oil applied in continuous frill cuts). No hazards to native plants were detected. Treatments for glorybush (Tibouchina urvilleana) (20% GARLON 4 in diesel oil on cut stumps) and yellow Himalayan raspberry (Rubus ellipticus) (40% GARLON 4 in foliar drizzle spray and 20% TORDON 22K in water on cut stumps) appeared quite effective; however further testing is necessary to refine treatments, verify results, and further assess potential harm to native plant species. Kahili ginger (Hedychium gardnerianum) was effectively controlled with TORDON 10K pellets; however further testing is warranted for several reasons. A 2% foliar sparay of ROUNDUP in water was completely effective on blackberry (Rubus argutus), but it did provide a good measure of control and would be useful in selected situations. Further testing on blackberry is necessary to increase treatment effectiveness and to evaluate other treatments. We recommend continued modest emphasis on herbicide research in Hawaii's native ecosystems to: increase control effectiveness for invasive plant species; evaluate the effects of retreatment regimes; increase knowledge of hazards to native plants and animals; broaden the range of safe chemical tools needed to integrate herbicides with other methods of ecosystem restoration; monitor operational herbicide programs for efficacy and cost effectiveness; increase long-term monitoring of treatment effects in selected areas; and determine and enhance responsible management programs in near-native ecosystems.

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RELEVANT TO BIOCONTROL
No.

KEY WORDS
Herbicidal control, Herbicides, Roundup, Tordon, Garlon.

IMAGES
13_100 -- forest 13_100 - forest
PATHOGEN: Aspergillus melleus
17_105 -- pre-treatment Brazilian holly, Kipahulu, Maui 17_105 - pre-treatment Brazilian holly, Kipahulu, Maui
PATHOGEN: Aspergillus melleus
17_106 -- treatment results of Roundup-treated Brazilian holly, Lower Kipahulu Valley, Maui 17_106 - treatment results of Roundup-treated Brazilian holly, Lower Kipahulu Valley, Maui
PATHOGEN: Aspergillus melleus

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