Pacific Southwest Research Station

Publication Information

Title: Site preparation affects survival, growth of koa on degraded montane forest land

Author: Scowcroft, Paul G.; Adee, Kenneth T.

Date: 1991

Source: Res. Pap. PSW-205. Berkeley, CA: U.S. Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 7 p

Station ID: RP-PSW-205

Description: Banana poka vines (Passiflora mollisimo) and kikuyu pass (Pennirerurn clandestinum) can limit koa (Acacia koa)reforestation in Hawaii. Performance of planted koa seedlings was studied in relation to type of site preparation: broadcast spraying of Roundup herbicide at three rates (2.02, 4.05, and 6.07 kg active ingredient per hectare) and hand scalping vegetation from each planting spot. One year after planting, survival and growth of koa seedlings were significantly greater in plots sprayed with a heavy dose of Roundup than in control plots. Ten year survival and height were significantly greater for the heavy dose treatment than for the scalp treatment, but none of the trees in the control treatment were alive. Site preparation must control competing vegetation over the entire planting area, to give koa a competitive edge during establishment.

Key Words: Acacia koa, Passiflora mollissima, Pennisetum landestinum, competition, Hawaii, reforestation

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Scowcroft, Paul G.; Adee, Kenneth T.  1991.  Site preparation affects survival, growth of koa on degraded montane forest land  Res. Pap. PSW-205. Berkeley, CA: U.S. Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 7 p.