Termiticidal activities in the heartwood, bark/sapwood and leaves of Juniperus species from the United States

Abstract

Twelve taxa of Juniperus from the United States were investigated for termiticidal activities of the heartwood, bark/sapwood and leaves. All taxa exhibited termiticidal activities for the fresh heartwood sawdusts. All except Juniperus scopulorum showed high termiticidal activities for the bark/sapwood sawdusts. The activity in the sawdusts could be removed by washing with hexane followed by methanol for about half of the taxa. Both hexane and methanol (sequential) extracts of the heartwoods showed termiticidal activities. Hexane and methanol (sequential) extracts of intact leaves displayed termiticidal activities for most of the taxa.