Brown bumps on stems and leaf veins are brown soft scale. Spray thoroughly outdoors with horticultural oil (Sunspray) to suffocate. Repeat in 2 months; monitor for reinfestation.

palm scale

palm scale
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White Scale on Crepe Myrtle: Systemic Imidacloprid Treatment
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Managing Scale on Sago Palms After Frond Removal
Staghorn Fern Scale: Pick Off or Use Oil
Sago Palm Scale: Horticultural Oil Works
Camellia Tea Scale and Barklice: Dual Pest Problem Requires Targeted Treatment
King Sago Palm Asian Scale: Regional Epidemic Management Reality
Sago Palm Scale in Maryland: Asian Scale Identification and Reality Check
Sago Palm Asian Scale: Persistent and Difficult
Scale Insects on Meyer Lemon: Sticky Leaves, Brown Bumps, and How to Save Your Tree
Wasps Swarming Magnolia Tree: Honeydew from Scale Insects
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