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Growth and Refoliation of Koa Trees Infested by the Koa Moth, Scotorythra paludicola (Lepidoptera: Geometridae)

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Title: Growth and Refoliation of Koa Trees Infested by the Koa Moth, Scotorythra paludicola (Lepidoptera: Geometridae)
Authors: Stein, John D.
Scowcroft, Paul G.
Issue Date: Oct 1984
Publisher: University of Hawai'i Press
Citation: Stein JD, Scowcroft PG. 1984. Growth and refoliation of koa trees infested by the koa moth, Scotorythra paludicola (Lepidoptera: Geometridae). Pac Sci 38(4): 333-339.
Abstract: Since the early 1900s, four major infestations of the koa moth,
Scotorythra paludicola (Butler), have defoliated koa (Acacia koa Gray) stands on
the island ofMaui. After trees on 7564 ha of the Makawao Forest Reserve were
damaged in 1977, a study was begun to determine growth and refoliation response
of completely defoliated tree s in a stand previously subjected to three
different silvicultural treatments. Relative growth rates before defoliation ranged
from 5.7 percent to 14.2 percent per year. Trees on thinned-and-fertilized plots
showed significantly greater relative growth rates than control trees. The relative
growth rates of trees on plots that were thinned only or fertilized only were not
significantly different from those of the control trees . After defoliation, relative
growth rates ranged from l.l percent to 4.3 percent with differences between
treatments not significant. The 71 percent reduction in growth after defoliation
was statistically significant. About one-third of the sample trees died within 20
months of defoliation.
ISSN: 0030-8870
Appears in Collections:Pacific Science Volume 38, Number 4, 1984

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