Abstract
During the past few years the pine needle scale, Phenacaspis pinifoliae (Fitch), has severely injured ponderosa pine, Engelmann spruce, and other evergreens in the Okanagan Valley of British Columbia. The home owner is most concerned because this insect is capable of ruining the appearance of evergreens on his property. Infestations may be severe on trees growing in submarginal forest areas.Field experiments were conducted in the South Okanagan Valley in 1955 to determine whether lime-sulphur, malathion, or Diazinon (0,0-diethyl-0-[2-isopropyl-4-methyl-pyrimidyl (6)] thiophosphate) would control the scale on ponderosa pine trees.
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