Dormant Control of Striped Pine Scale with Sunspray Ultra Fine Horticultural Oil in Indiana, Pennsylvania, 1991

Sunspray oil was applied to evaluate control of overwintering striped pine scale nymphs on heavily infested 6-8 ft Scotch pine Christmas trees. Oil was applied on 16 Apr, and replicated four times in a complete randomized block design. Foliar treatments were applied with a Solo Master 412 back pack mist blower operating at full throttle on setting two. Treatments were applied at the rate of 150 gal/acre (454 ml/tree). The following conditions existed on 16 Apr: air temperature, 53°F; water pH, 7.0; RH, 86%; and skies were overcast. Four twigs were randomly selected from each tree, and the viability of the first 50 nymphs was recorded for a total of 200 nymphs per replicate.