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Title: Control of yellow Himalayan raspberry (Rubus ellipticus Sm.) with cut stump herbicide treatments in Hawaii Volcanoes National Park 
Author: Santos, Gregory L; Cuddihy, Linda W; Stone, Charles P
Date: 1991-09
Publisher: Cooperative National Park Resources Studies Unit, University of Hawaii at Manoa, Department of Botany
Citation: Santos GL, Cuddihy LW, Stone CP. 1991. Control of yellow Himalayan raspberry (Rubus ellipticus Sm.) with cut stump herbicide treatments in Hawaii Volcanoes National Park. Honolulu (HI): Cooperative National Park Resources Studies Unit, University of Hawaii at Manoa, Department of Botany. PCSU Technical Report, 80.
Abstract: Yellow Himalayan raspberry (Rubus ellipticus Sm.), introduced to Hawai'i Island approximately 30 years ago, has become a serious pest in the 'Ola'a Tract of Hawaii Volcanoes National Park. This shade-tolerant raspberry forms dense thickets, which replace native understory vegetation. Four herbicides were effective cut-stump treatments for yellow raspberry: imazapyr (Arsenal, 50% in water), triclopyr triethyl mine salt (Garlon 3 4 50% in water), triclopyr butoxyethyl ester (Garlon 4, 50% in diesel oil), and metsulfuron methyl (Escort, 28 gm/liter water). Ninety-five to one hundred percent of raspberry plants treated with these chemicals died within 24 months. With each of the four treatments, 10-15% of raspberry plants resprouted from the roots, but at least half of the resprouts later died. Two other herbicides tested were much less effective at killing raspberry. Picloram potassium salt (Tordon 22K, 20% in water) killed only 65% of treated plants, and a commercial mix of 2,4D and triclopyr (Crossbow, 50% in diesel oil) caused the death of 75% of treated raspberry. Fifteen common native plant species and 10 others of sporadic occurrence were monitored for a year in plots surrounding treated raspberry plants. No statistically significant changes in number were observed for any native species in any herbicide treatment. In general, the number of individuals taller than 0.1 m counted in herbicide plots increased over the year for six common native fern species, one sedge, and one herb. Results were more variable for seven native woody species common in study plots, with increases in numbers in some treatments and small decreases in others. Both picloram and imazapyr plots displayed losses in a larger variety of native woody species than were observed in the other treatments. Saplings of one native tree, olomea (Perrottetia sandwicensis) appeared to be particularly sensitive to both picloram and imazapyr applied to nearby raspberry stumps.
Series/Report No.: Technical Report
80
Description: Reports were scanned in black and white at a resolution of 600 dots per inch and were converted to text using Adobe Paper Capture Plug-in.
Sponsorship: National Park Service Contract No. CA 8017 2 0001
URI: http://hdl.handle.net/10125/7167
LC Subject Headings: Hawaii Volcanoes National Park (Hawaii)
Herbicides -- Testing -- Hawaii -- Hawaii Island.
Invasive plants -- Control -- Hawaii -- Hawaii Island.
Rubus -- Hawaii.

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