There should be little damage from these use rates on dormant plants but summer oil uses may cause injury to sensitive plants at the higher rates. Oil applications should not be made during periods of excessively high or low temperatures. Dormant treatments should not be made unless temperatures are at least 50 degrees or the spray will fail to spread adequately. At temperatures approaching 90 degrees leaf burning by a variety of insecticides, including oils, is most common. Several chemicals should not be combined with oil sprays since they may result in reduced treatment effectiveness or increase the possibility of plant injury.
Some plants are inherently quite sensitive to oil.
Other maples, walnut and related nut trees are also reportedly oil sensitive. In general leaves of plants that are very hairy are more susceptible to oil spray injury including young leaves of apple and lilac.