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Forestry 1973 46(1):81-93; doi:10.1093/forestry/46.1.81
© 1973 by Institute of Chartered Foresters
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Editorial

Insecticidal Control of the Pine Looper Moth in Great Britain

III. Aerial Spraying with Tetrachlorvinphos

T. M. SCOTT and RONALD M. BROWN

Forestry Commission Research Station

In 1969 the routine annual survey of pupal populations of Bupalus piniarius L., the Pine looper moth, did not include the forest areas of Wykeham and Langdale where, unnoticed, a build-up of the population to epidemic proportions had taken place resulting in the complete defoliation of 150 acres (61 ha). Surveys carried out in these and the surrounding areas in 1970 revealed extremely high counts, indicating the strong possibility that insecticidal control would be necessary. Alternative insecticides to DDT were screened and the more promising were field tested resulting in the selection of tetrachlorvinphos. Egg counts were used to confirm the presence of a damaging population and to define its boundaries for control spraying which was carried out over 1,300 acres (526 ha). Estimates of larval mortality and later assessments of pupae indicate that the control operation was successful.


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