Look for signs of oystershell scale on lilacs, dogwood, or other woody plants. Use summer oil sprays, if scale is present. CSU Fact sheets 2.945, 5.569, or 5.513
Check for larvae of tussock moth on spruce trees. If you see needle damage, get CSU Fact sheet 5.542.
Watch for sawfly larvae stripping gooseberry and currant foliage. Control immediately with strong water pressure or insecticidal soap spray.
Damage to junipers and other plants in hot, dry locations may be caused by spider mites. If tiny red insects fall when you shake a branch over white paper, spray the tree with strong water pressure or insecticidal soap. Summer horticultural oil will work if it is approved for the affected plant.
You may notice areas of dead grass in your lawn, especially if the weather has been wet. Fungal disease may be the cause. Cut out a sample of the diseased area and adjacent healthy sod and bring it to your local cooperative extension office for diagnosis and treatment suggestions.
For more information:
View Pest Alert newsletters 1994 to present
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