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A total of 849 red pine plantation diagrams were collected from the forest community and sketched onto 1:50,000 scale topographic maps. An aerial assessment was conducted beginning in the western counties in October 1990 and continuing eastward through to February 1991. Visual assessments were made for occurrence and severity of symptoms according to the average percentage of shoots affected per infected tree. General assessments on the height of plantations were also made, and each plantation was labelled as young (less than or equal to 3 m in height), pole (between 4 m and 6 m in height), or immature-mature (greater than 6 m in height). This research provides the results of the survey.
Describes the symptoms, host range, impacts, biology, and control of Sirococcus shoot blight caused by the fungus Sirococcus conigenus in the Lake States.
Sirococcus shoot blight, caused by the fungus Sirococcus conigenus, is the most serious forest pest problem in red pine plantations. Red pine trees of any size can be affected and entire plantations have been killed by this disease in Nova Scotia. This report describes trials conducted to test and demonstrate whether sirococcus shoot blight can be controlled by pruning in red pine plantations in Nova Scotia. Four plantations having different degree of blight infection were used as test sites. One plantation with a high infection rate was used as control, and the others were subjected to treatments consisting of pruning, removing, and burning all infected shoots and branches. Plots were then assessed annually during fall to early spring from 1989 to 1992. Recommendations for red pine management are made based on the results.