Abstract
In 1970 and 1971 a high population of Rhyacionia buoliana (Denis and SchiffermÜller), the Pine shoot moth, appeared in a seed orchard of Pinus contorta Douglas ex Loud, in Wiltshire. The opportunity was taken to compare several alternative insecticides with DDT. Field trials in March and August showed that fenitrothion can be used as an alternative to DDT to control the Pine shoot moth.