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Filtering by: Creator Witcosky, Jeffrey John

Insects associated with black stain root disease of Douglas-fir in western Oregon

Creator:

Witcosky, Jeffrey John

Abstract:

The root systems of Douglas-fir trees infected with Verticicladiella wagenerii and assigned by crown color and terminal growth characteristics to several stages of decline were excavated at three widely separated sites in the Coast Range of Oregon. Data were gathered on insect species present, extent of colonization of the root...

Resource Type:

Masters Thesis
The root insect-- black-stain root disease association in Douglas-fir : vector relationships and implications for forest management

Creator:

Witcosky, Jeffrey John

Abstract:

Verticicladiella wageneri Kendrick is a vascular wilt pathogen of conifers, causing a black staining of colonized sapwood of roots and lower stem. In Douglas-fir, V. wageneri is intimately associated with insects. Hylastes nigrinus, Pissodes fasciatus, and Steremnuis carinatus are commonly associated with diseased hosts, carry inoculum of V. wageneri in...

Resource Type:

Dissertation