When the highly refined, lightweight oil is mixed with water and applied, it coats the branches, twigs, and buds. Applying the spray directly to the fruit trees minimizes this collateral damage.
Dormant Oil Spray Fruit Tree Protection for Winter Pests
It then suffocates overwintering insects—such as scale insects, spider mites, and aphids—by blocking their respiratory pores. This ensures the tree is fully dormant but the oils or residual chemicals in the treatment can effectively kill insects.
Furthermore, the oil dissolves the protective wax coatings of insect eggs and mite eggs, causing them to dehydrate and die before they can hatch. Most modern dormant oils are concentrated emulsions that require careful dilution with water according to the specific temperature and the product label.
Dormant Oil Spray for Fruit Tree Protection: How It Safely Eliminates Overwintering Pests
By applying dormant oil, gardeners reduce the initial pest load, meaning less pressure on the tree when it breaks dormancy and begins to grow. While the naked eye sees only dormant branches and sleeping buds, a hidden world of insect eggs and overwintering scales clings to the bark.
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