Summer Horticultural Oils
Summer horticultural oils 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 and aphid populations when applied at petal fall timing and subsequently at 2 and 4 weeks after petal fall. Using oil at a concentrate rate higher than 1 percent solution 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.
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