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Apple to walnut, aphids to rust now is time for dormant spraying.

In the mild-winter West, where changes in season are less dramatic than elsewhere, it's easy to overlook a clearly seasonal and seemingly mundane garden job like dormat spraying. But you'd be wise to grab the opportunity to do it now.

Where winters are mild, certain harmful insects, mites, and disease organisms can live over winter and reappear in spring. Dormant spraying with relatively non-toxic substances (listed in the chart below) can dispatch them now, minimizing the need to spray in spring with stronger chemicals.

The chart lists 15 types of deciduous plants and the harmful insects, mites, and diseases that can overwinter on each in much of the West. If your plants suffered attacks from any of these troublemakers this past season, see the right-hand column for what and when to spray.

The substances are copper sulfate, a light petroleum oil often called Volck oil or Superior oil, and lime sulfur. Several brands of these sprays are available at nurseries and garden centers.

Spray on a sunny, still day, when the temperature is higher than 45 deg. Follow label directions. Be certain to cover the whole plant.
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Copyright 1986 Gale, Cengage Learning. All rights reserved.

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Date:Jan 1, 1986
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