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The Chemical Control of the Wattle Bagworm, Kotochalia junodi (Heyl.), by Aerial Spraying. II.—The Use of Toxaphene and Endrin in the earlier Stages of an Infestation*

Published online by Cambridge University Press:  10 July 2009

L. L. J. Ossowski
L. L. J. Ossowski
Affiliation:
Wattle Research Institute, University of Natal, Pietermaritzburg, South Africa
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Summary

Replicated sample plots of wattle (Acacia) were sprayed from the air with 2 oz. endrin and 1½, 2¼, 3 and 6 lb. toxaphene per acre, each in light diesel oil, to test the effect of these insecticides on the bagworm, Kotochalia junodi (Heyl.), and other wattle fauna. All invertebrates which fell from the sample trees were collected on sheets at intervals after spraying and identified. The mortality of bagworms was assessed after 10 to 14 days.

The mean corrected mortality was significantly lower in the treatment with 1½ lb. toxaphene than in the others, which, however, did not differ significantly amongst themselves. In all cases the kill was greater in the upper than in the lower parts of the tree crowns. There was no difference in the final percentage “fall-off” of bagworms in all plots, though in those treated with endrin the initial rate was higher. A very high kill, ranging from 96·6 to 98·5 per cent., was obtained in all but the 1½ lb. toxaphene plots, but even the 6 lb. application was not sufficient to reduce the bagworm population to its endemic level.

The arthropods, other than bagworms, collected on ground sheets are listed by Orders and Families and also classified into groups as beneficial, indifferent, and harmful. Nearly two-thirds of the total were found to be beneficial.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 49 , Issue 2 , July 1958 , pp. 229 - 233
Copyright
Copyright © Cambridge University Press 1958

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References

Anon. (1954). Entomology.—Rep. Wattle Res. Inst. Univ. Natal, 1953–54, pp. 24–26.Google Scholar
Anon. (1956). Entomology.—Rep. Wattle Res. Inst. Univ. Natal, 1955–56, pp. 22–24.Google Scholar
Ossowski, L. L. J. (1954). An aerial spraying experiment against Wattle Bagworm (Acanthopsyche junodi Heyl.).—Rep. Wattle Res. Inst. Univ. Natal, 1953–54, pp. 49–53.Google Scholar
Ossowski, L. L. J. (1956 a). Spraying experiments with insecticides against Wattle Bagworm (Acanthopsyche junodi Heyl.).—Rep. Wattle Res. Inst. Univ. Natal, 1955–56, pp. 42–45.Google Scholar
Ossowski, L. L. J. (1956 b). A guide to the assessment of Wattle Bagworm infestations.—8 pp. Pietermaritzburg, S. Afr. Wattle Gr. Un.Google Scholar