Abstract-Diesel fuel oil was applied to mountain pine beetle (Dendroctonw ponderosne Hopkins) infested bolts of ponderosa pine (Pinzo ponderosa Lawson) in early June. Just prior to the fuel oil application and 6 weeks later, 0.5 ft2 bark samples were removed from each bolt and the numbers of live beetles counted. Beetle survival was 8.3% in bolts arranged in a single layer and 4.8% in bolts arranged in 2 layers.
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