Summer oils (BioCover, Damoil, JMS Stylet oil, Mite-E-Oil, Omni Supreme Spray, Par F70 Soluble Oil, Sunspray Ultrafine Oil)
These are horticultural "superior oils" with a narrow 10 to 90 percent distillation range that permits relatively safe use on apple foliage during the summer months. In orchards under an effective prebloom mite control program, a summer oil can effectively suppress mite populations when applied at petal fall and in two subsequent cover sprays at rates of 1 to 2 gallons per 100 gallons finish spray solution, using a minimum of 100 gallons of spray per acre. Some leaf spotting may occur at the 2-gallon-per-100 rate. The rate of 1 gallon per 100 in these three applications may not be adequate for season-long control under conditions of severe population pressure; however, effective control has been achieved in such conditions using 0.5 to 1 gallon per 100 in a seasonal program starting at petal fall and continuing on a 2-week schedule until mid-August. Using oil at concentrate rates increases the likelihood of phytotoxicity and is therefore not recommended. Apple variety and spray drying conditions should be taken into account to minimize any possible effects on fruit finish. The slow drying conditions and extremes of cool or hot conditions should be avoided when applying horticultural mineral oils. Treatment with other materials is generally not recommended at this time unless all previous sprays were either omitted or completely ineffective.
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