Calico Scale on Trees: Identification and Simple Mechanical Control

Q: Any idea what these black and white things are? They're on trees along a front walkway near Atlantic Station.

They are calico scale. Control by scraping them off the trunk and monitoring for recurrence next year.

Scrape them off and the problem should be over.

About Gardening: Euonymus Scale: Identification and Control; Scale Insects on Cattleya: Alcohol Removal and Systemic Treatment; Scale Infestation on Orchids: Systemic Treatment and Prevention Strategy; Milkweed Aphids: Bright Yellow but Harmless to Monarchs; Puss Caterpillar: Identification, Sting Severity, and Safe Removal; Wax Scale on Boxwood: Identification and Treatment Timing; Wax Scale on Boxwood: White Bumps With Red Undersides—Spray Oil Now, Carbaryl in April; Honey Mushrooms in the Lawn: Fungus Feeding on Old Roots; Saffron Crocus: Growing Your Own Precious Spice; Twig Girdler Beetles: Why Your Hardwoods Drop Green Twigs

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