Assessment of two Pine Oil Treatments to Protect Stands of Lodgepole Pine from Attack by the Mountain Pine Beetle
AbstractPine oil (Norpine-65) was evaluated as an infestation deterrent for the mountain pine beetle, Dendroctonus ponderosae Hopkins, in a high hazard forest of lodgepole pine, Pinus contorta var. latifolia Engelmann. Two experimental treatments were tested, each in four, 9 ha, square blocks (replicates): 1) spraying trees in a grid at 50m centres with 1.8 L of pine oil/tree, and 2) creating a " barrier" consisting of a double line of pine oil sprayed trees, 25 m apart, 25 m with in the block boundary. There were significantly reduced ratios of newly-infested (green) trees to the previous year's infested (red) trees in both treatments compared to control blocks. However. neither treatment prevented beetles from attacking semiochemical-baited trees 75 m in side the block boundaries, and neither treatment is recommended for operational use. At maximum costs/ha of $22.04 and $43.39 (Can.) for grid and barrier treatments. respectively, the operational use of a repellent. or an insecticide would approach cost effectiveness if it reduced new infestations of D. ponderosae by 1 or 2 trees/ha. respectively.
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