Mistletoes are stem hemiparasites, which grow on the branches of a host tree or shrub and take water, water-conducted nutrients and organic solutes from the host’s xylem. There are two major mistletoe families, Loranthaceae and Viscaceae. The Loranthaceae are principally Southern Hemisphere in distribution, with between 50 and 80 genera (Barlow, 1983). New Zealand has six native species in the ...

We investigated the distribution and severity of trees infected with western hemlock dwarf mistletoe (Arceuthobium tsugense (Rosendahl) G.N. Jones subsp. tsugense) in an old-growth Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) – western hemlock (Tsuga heterophylla (Raf.) Sarg.) forest. With the use of Hawksworth six-class dwarf mistletoe rating system, infection status was assessed for 351...

A broader, more comprehensive concept of forest pest management is needed to make it a really integral part of forest resource management. A generalized model structure of a forest pest management system is presented, and the major components are discussed briefly. Predictive models are the primary mechanism of information flow to decision and action in the system. General considerations affect...