Photos from the WFIWC Archives:
Control Methods

Packing orthodichlorobenzene insecticide for spraying Engelmann spruce infested with the spruce beetle, Arapaho National Forest, CO, August 1950. One million trees were treated. At first, the spray was diluted in fuel oil; subsequently, an emulsion formulation was developed so that only the concentrate needed to be packed into the forest where water from streams was available. The outbreak collapsed in the following winter due to all-time low temperatures. (Furniss 2007A, Fig. 12).

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