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EFFECT OF ASH FROM MOUNT ST. HELENS ON SURVIVAL OF NEONATE LARVAE OF THE DOUGLAS-FIR TUSSOCK MOTH (LEPIDOPTERA: LYMANTRIIDAE)

Published online by Cambridge University Press:  31 May 2012

R. R. Mason ,
B. E. Wickman  and
H. G. Paul
R. R. Mason
Affiliation:
Range and Wildlife Habitat Laboratory, Pacific Northwest Forest and Range Experiment Station, U.S. Department of Agriculture, La Grande, Oregon 97850
B. E. Wickman
Affiliation:
Range and Wildlife Habitat Laboratory, Pacific Northwest Forest and Range Experiment Station, U.S. Department of Agriculture, La Grande, Oregon 97850
H. G. Paul
Affiliation:
Range and Wildlife Habitat Laboratory, Pacific Northwest Forest and Range Experiment Station, U.S. Department of Agriculture, La Grande, Oregon 97850
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Extract

The eruption of Mount St. Helens in southwestern Washington on 18 May 1980, ejected tons of volcanic ash that settled over large portions of eastern Washington, northern Idaho, and western Montana. Although most of these areas received only a light dusting, the heaviest deposits in the central path of the ash plume formed a layer of ash 5 to 8 cm thick (Cook et al. 1981). The ash consisted of microscopic, jagged particles that were highly abrasive and easily damaged the epicuticular wax layer of insects, causing desiccation and eventual death (Brown and Hussain 1981). The impact of ash on a variety of agricultural-related insects in the fallout area has been described (Akre et al. 1981; Fye 1983; Howell 1981; Johansen et al. 1981; Klostermeyer et al. 1981). This note reports the effects of ash on small larvae of a major forest defoliator, the Douglas-fir tussock moth, Orgyia pseudotsugata (McDunnough), as determined in laboratory and field experiments.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 8 , August 1984 , pp. 1145 - 1147
Copyright
Copyright © Entomological Society of Canada 1984

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References

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