Factors used to determine the year of origin of blister rust cankers on sugar pine
Miller DR. 1967. Factors used to determine the year of origin of blister rust cankers on sugar pine. U.S. Department of Agriculture, Forest Service. San Francisco, California
The correct age of white pine blister rust cankers growing on sugar pine is of prime importance when analyzing an infection center. The important factors to be considered when determining the year-origin of blister rust cankers are 1) stage of canker development, 2) year of wood on which canker originated, 3) persistence of needle retention, 4) thriftiness of tree or limb on which the canker is growing, 5) point at which infection entered the tree, and 6) the year-dates favorable to the spread and intensification of the rust. Usually two or more factors must be considered, and occasionally all knowledge and available information regarding cankers must be used before the age of a canker can be determined with any degree of certainty. The following discussion of the foregoing factors will serve to point up the importance of each in determining the age of a canker.
- Type
- Published Report
- Authors
- Miller, Douglas
- Date of Issue
- 1967-04
- Publisher
- U.S. Department of Agriculture, Forest Service
- Units
- LAVO
- Keywords
- Blister rust, canker, invasive pest, origin, pathogens, sugar pine, terrestrial vegetation, white pine, year