Dormant or semi-dormant plants will tolerate heavier deposits than trees in leaf. The lower the distillation temperature the quicker the evaporation. When related to viscosity and the UR it can provide an index to oil paraffinicity. Oils should be largely paraffinic to be safe for plants. Thirty degrees is the minimum standard.
Horticultural oils are an effective and safe way to control scale on pecans.
As I stated above, pecan is considered an oil sensitive crop therefore only dormant oils are recommended. When applying, make sure there is good agitation in the tank. Even though you are making an application on a dormant tree, injury or tree death can occur if there is poor agitation and trees receive too much oil.