The use of oil sprays has proved of value in grasshopper control operations on the open range lands of British Columbia under certain specific conditions.

Only when a species, such as Camnula pellucida (Scudder), which deposits it eggs in definite egg-beds which have heen definitely located and staked during the previous summer, or when nymphs or adults are concentrated in very large numbers in small depressions or, as in the case of Melanoplus mexicanus mexicanus (Saussure), on tall weeds, and when weather conditions are not favourable for poisoning, is the use of oil sprays justified as an adjunct to the regular poisoned bait campaign.