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Three stem rusts, Western Gall Rust, (Endocronartium harnessii (J.P Moore) Hiratsuka Stalactiform Blister Rust, (Cronartium coleosporiodes Arthur) and Comandra Blister Rust, (Cronartium comandrae Peck), are widespread across the Suboreal Spruce Climatic Zone (SBS) of British Columbia. these rust species are restricted to two and three needle pine host species. In sub-boreal forests these rusts are a major pathogens of lodgepole pine. Western Gall Rust unlike the other two species does not require an alternate host to complete its life cycle and is therefore more widespread than Stalactiform Blister Rust and Comandra blister rust. The range of these later rusts correlates with the range of lodgepole pine (its aecial host) but is restricted to areas where its host and alternate hosts overlap. The alternate host of Comandra Blister Rust is Bastard toadflax (Geocaulon lividum Richardson), while Stalactorm blister rust has more than one alternate host. These hosts include; Cow wheat (Melampyrum lineare), Indian paintbrush (Castellejia miniata) and Yellow rattle (Rhinanthus crista galli), listed in terms of commonness across the landscape. These rust species are a significant threat to pine plantations causing significant mortality, as well as degradation of wood quality and growth potential. There is a need to develop a rust hazard rating system which will help guide effective sustainable resource management of the pine resource by ensuring full stocking in rust risk sites. Identification of high risk sites will enable resource managers to effectively target ecologically based silviculture regimes. In response to this need Richard Reich initiated a pine stem rust hazard rating project in the year 2000. This ongoing project is multifaceted and involves several concurrent projects studying various aspects of pine stem rust. One of the primary products of pine rust hazard rating is the creation pine stem rust hazard rating maps for the Prince George TSA. In coordination with other decision support tools these maps will be very useful for forest planning and operational management operations. The specific objective of this phase of the stem rust research project is creation of a rust hazard map. To accomplish this we have produced a preliminary rust hazard map of the Prince George TSA, based on current ecological research and expert ecological knowledge. In addition we have completed a field sampling plan in order gather further critical site factor data during the year 2007 field season. Data collected will serve three purposes: first it will help to calibrate and correct the preliminary rust hazard rating map; second, it will help advance our knowledge of site factors crucial to developing a decision support tool for effectively managing pine stem rust; third, it will provide information for helping to test the effects of current and past management practices as well as to point to new pine rust mitigation management procedures and techniques. Preliminary hazard mapping assumptions and rules and the field sampling planning are described below.
completed by Ken Simonar and Saphida Migabo.
Simonar, Ken, Migabo, Saphida. 2007. Pine stem rust hazard rating: preliminary hazard map and field sampling plan for Prince George TSA. Forest Investment Account (FIA) - Forest Science Program. Forest Investment Account Report. FIA2007MR194
Topic: FLNRORD Research Program
Keywords: Forest, Investment, Account, (FIA), Rust, Diseases, British, Columbia
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