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Why is the timing of dormant spray important?
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Using a delayed dormant oil is an effective control for several small pests, such as aphids, mites and scale. You want to apply the spray before the blossoms open so that you kill the eggs before they hatch as the temperature gets warmer. Also, if you wait until after the blossoms open, and if you have included an insecticide with the oil, you could seriously hurt or kill the pollinators that come to pollinate the flowers. If you spray when the blossoms are open, the oil may damage the blossoms and prevent fertilization of the flower which could diminish your fruit production.
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