Using Refined Horticultural Oils on Home Fruit Trees
Since the turn of the century, growers have used oil sprays to control insects overwintering in fruit trees. Today’s superior
horticultural oils are much lighter and faster-drying than the oils used in the past. The old oil sprays contained impurities
which turned the leaves brown if sprayed on green foliage. Thus, the sprays were used only in the dormant season.
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Creator: George Hamilton